HUAWEI Elastic IP User Manual

Download

Elastic IP

FAQs

Issue 13

Date 2021-01-08

HUAWEI TECHNOLOGIES CO., LTD.

No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specied in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every eort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

Elastic IP FAQs Contents

1 Product Consultation.............................................................................................................. 1

1.1 What Is a Quota?.................................................................................................................................................................... 1

1.2 How Do I Assign or Retrieve a

1.3 What Are the

.............................................................................................................................................................................................................. 2

1.4 Can an EIP That Uses Dedicated Bandwidth Be Changed to Use Shared Bandwidth?...................................3

1.5 Can I Bind an EIP to Multiple ECSs?................................................................................................................................. 3

1.6 What Are the Dierences Between the Primary and Extension NICs of ECSs?.................................................3

1.7 What Is the EIP Assignment Policy?................................................................................................................................. 3

1.8 Can I Assign a

1.9 Does an EIP Change Over Time?....................................................................................................................................... 4

1.10 How Do I Query the Region of My EIPs?..................................................................................................................... 4

1.11 Can a Bandwidth Be Used by Multiple Accounts?.................................................................................................... 4

1.12 How Do I Change an EIP for an Instance?...................................................................................................................4

1.13 What Are the

1.14 Do I Need to Congure a Shared Data Package for Use After It Is Purchased?.............................................8

1.15 What Should I Do If I Cannot Find My Purchased EIP on the Management Console?................................8

Dierences Between EIP, Private IP Address, Floating IP Address, and Virtual IP Address?

Specic EIP?................................................................................................................................................. 4

Dierences Between Shared Data Package and Shared Bandwidth?.................................... 7

Specic EIP?.................................................................................................................. 2

2 Billing and Payments............................................................................................................10

2.1 How Is an EIP Billed? ..........................................................................................................................................................10

2.2 How Do I Change the Billing Mode?............................................................................................................................. 11

2.3 How Do I Change the Bandwidth Billing Option from Bandwidth to

Bandwidth?................................................................................................................................................................................... 13

Trac or from Trac to

3 EIP Binding and Unbinding................................................................................................. 14

3.1 How Do I Access an ECS from the Internet After an EIP Is Bound to the ECS?.............................................. 14

3.2 How Do I Access the Internet Using an EIP Bound to an Extension NIC?........................................................ 14

3.3 Can I Bind an EIP to an ECS, to Another ECS?............................................................................................................16

3.4 Can Multiple EIPs Be Bound to an ECS?....................................................................................................................... 16

3.5 Can I Bind an EIP to a Cloud Resource in Another Region?.................................................................................. 17

4 Bandwidth............................................................................................................................... 18

4.1 What Is the Bandwidth Size Range?.............................................................................................................................. 18

4.2 How Do I Increase a Bandwidth to Be More Than 300 Mbit/s?...........................................................................18

4.3 What Bandwidth Types Does the VPC Service Support?.........................................................................................18

4.4 How Do I Buy a Shared Bandwidth?..............................................................................................................................19

Elastic IP FAQs Contents

4.5 Is There a Limit to the Number of EIPs That Can Be Added to Each Shared Bandwidth?..........................19

4.6 What Are the Dierences Between a Dedicated Bandwidth and a Shared Bandwidth? Can a Dedicated

Bandwidth Be Changed to a Shared Bandwidth or the Other Way Around?.........................................................19

4.7 What Are Inbound Bandwidth and Outbound Bandwidth?...................................................................................19

4.8 How Do I Know If My Used Bandwidth Exceeds the Limit?.................................................................................. 20

4.9 Can I Increase My Bandwidth Billed on Yearly/Monthly Basis and Then Decrease It?.................................22

4.10 What Is the Relationship Between Bandwidth and Upload/Download Rate?.............................................. 22

4.11 What Are the Dierences Between Static BGP and Dynamic BGP?................................................................. 23

5 Connectivity............................................................................................................................ 24

5.1 What Are the Priorities of the Custom Route and EIP If Both Are Congured for an ECS to Enable the

ECS to Access the Internet?...................................................................................................................................................... 24

5.2 Why Does Internet Access Fail Even If My ECS Is Bound with an EIP?..............................................................24

5.3 Why Cannot an EIP Be Pinged?....................................................................................................................................... 28

5.4 How Do I Unblock an EIP?................................................................................................................................................ 35

Elastic IP FAQs 1 Product Consultation

1 Product Consultation

1.1 What Is a Quota?

What Is a Quota?

A quota limits the quantity of a resource available to users, thereby preventing spikes in the usage of the resource. For example, a VPC quota limits the number of VPCs that can be created.

You can also request for an increase in quota if an existing quota cannot meet your service requirements.

How Do I View My Quotas?

1. Log in to the management console.

2. Click

3. In the upper right corner of the page, choose Resources > My Quotas.

The Service Quota page is displayed.

Figure 1-1 My Quotas

in the upper left corner and select the desired region and project.

4. View the used and total quota of each type of resources on the displayed page.

NO TE

Elastic IP FAQs 1 Product Consultation

If a quota cannot meet service requirements, apply for a higher quota.

How Do I Apply for a Higher Quota?

1. Log in to the management console.

2. In the upper right corner of the page, choose Resources > My Quotas.

The Service Quota page is displayed.

Figure 1-2 My Quotas

3. Click Increase Quota.

4. On the Create Service Ticket page, congure parameters as required.

In Problem Description area, ll in the content and reason for adjustment.

5. After all necessary parameters are congured, select I have read and agree

to the Tenant Authorization Letter and Privacy Statement and click Submit.

1.2 How Do I Assign or Retrieve a

If you want to retrieve an EIP that you have released or assign a specic EIP, you can use APIs. When assigning an EIP, set the value of ip_address to the IP address that you want to assign. For details, see Elastic IP API Reference.

● If the EIP has been assigned to another user, you will fail to assign your required EIP.

● You cannot use the management console to assign a

Specic EIP?

specic EIP.

1.3 What Are the Dierences Between EIP, Private IP Address, Floating IP Address, and Virtual IP Address?

An EIP is an IP address that can be accessed over the Internet. Each EIP can be used by only one ECS at a time.

A private IP address is used by the internal network of the public cloud for internal communications. It cannot be accessed over the Internet.

Elastic IP FAQs 1 Product Consultation

A oating IP address is similar to an EIP. They are both public IP addresses that are used to connect to the Internet, but a oating IP address API cannot be used to congure bandwidth parameters. For details, see Floating IP Address.

A virtual IP address can be shared among multiple ECSs. A virtual IP address is used for active/standby switchover of ECSs for higher availability. If the active ECS becomes faulty and cannot provide services, the virtual IP address is dynamically re-assigned to the standby ECS so services can continue uninterrupted. For details, see Virtual IP Address Overview.

1.4 Can an EIP That Uses Dedicated Bandwidth Be Changed to Use Shared Bandwidth?

No. An EIP that uses the dedicated bandwidth cannot be changed to use shared bandwidth.

In addition, an EIP that uses the shared bandwidth cannot be changed to use the dedicated bandwidth.

1.5 Can I Bind an EIP to Multiple ECSs?

Each EIP can be bound to only one ECS at a time.

Multiple ECSs cannot share the same EIP. An ECS and its bound EIP must be in the same region. If you want multiple ECSs in the same VPC to share an EIP, you have to use a NAT gateway. For more information, see NAT Gateway User Guide.

1.6 What Are the

Dierences Between the Primary and

Extension NICs of ECSs?

The dierences are as follows:

● Generally, the OS default routes preferentially use the primary NICs. If the OS default routes use the extension NICs, network communication will be interrupted. Then, you can check the route network communication error.

● Primary NICs can communicate with the public service zone (zone where PaaS and DNS services are deployed). Extension NICs cannot communicate this zone.

conguration to rectify the

1.7 What Is the EIP Assignment Policy?

By default, an EIP is assigned randomly.

In case that an EIP is released by mistake, the system will assign you the EIP that you have released in the last 24 hours preferentially.

If you want an EIP that you released 24 hours ago, see How Do I Assign or

Retrieve a

Specic EIP?.

Elastic IP FAQs 1 Product Consultation

If you do not want an EIP that you have released, it is recommended that you buy an EIP rst and then release the one that you do not require any more.

1.8 Can I Assign a Specic EIP?

By default, an EIP is assigned randomly. If you used to release EIPs, the system preferentially assigns an EIP from what you released.

To assign a specic EIP, you can call APIs. For details, see Assigning an EIP.

1.9 Does an EIP Change Over Time?

The EIP bound to an ECS will not be changed after the ECS is stopped and then started.

Stopping and starting an ECS does not aect its EIP.

An EIP will be released if it expires or is in arrears.

1.10 How Do I Query the Region of My EIPs?

You can visit https://en.ipip.net/?origin=CN to query the region of your EIPs.

● The region of an IP address you searched through a third-party website may be dierent from the actual region to which the IP address belongs.

● If the region searched through a third-party website is dierent from that searched on https://en.ipip.net/?origin=CN, use the region searched on

https://en.ipip.net/?origin=CN.

● If the region searched on https://en.ipip.net/?origin=CN is region you selected when purchasing the EIP, use the region you selected when purchasing the EIP.

● If your service is adversely region of the EIP you searched on the third-party database and the region of the EIP you selected when buying the EIP, submit a service ticket.

To know more about the region of EIPs, submit a service ticket.

aected due to the inconsistency between the

dierent from the

1.11 Can a Bandwidth Be Used by Multiple Accounts?

A bandwidth cannot be used by dierent accounts. Each account can use and manage only its own EIP bandwidths.

1.12 How Do I Change an EIP for an Instance?

Scenario 1: Changing an EIP for an ECS

1. Unbind an EIP.

a. Log in to the management console.

Elastic IP FAQs 1 Product Consultation

b. On the console homepage, under Network, click Elastic IP.

c. On the displayed page, locate the row that contains the target EIP, and

click Unbind.

d. Click Yes.

2. Assign an EIP.

a. Log in to the management console.

b. On the console homepage, under Network, click Elastic IP.

c. On the displayed page, click Buy EIP.

d. Set the parameters as prompted.

e. Click Next.

3. Bind the new EIP to the ECS.

a. On the EIPs page, locate the row that contains the target EIP, and click

Bind.

b. Select the desired ECS.

c. Click OK.

4. Release the EIP that has been replaced.

a. Release a single EIP.

i. Log in to the management console.

ii. On the console homepage, under Network, click Elastic IP.

iii. In the EIP list, locate the row that contains the target EIP, and click

Release.

iv. Click Yes.

b. Unbind multiple EIPs at a time.

i. Log in to the management console.

ii. On the console homepage, under Network, click Elastic IP.

iii. In the EIP list, select the EIPs to be unbound.

iv. Click Unbind above the EIP list.

v. Click Yes.

Scenario 2: Changing an EIP for a Load Balancer

1. Unbind an EIP.

a. Log in to the management console.

b. Click Service List. Under Network, click Elastic Load Balance.

c. In the load balancer list, locate the target load balancer and choose More

> Unbind EIP in the Operation column.

d. Click Yes.

2. Assign an EIP. For details, see 2.

3. Bind the new EIP to the load balancer.

a. Log in to the management console.

b. Click Service List. Under Network, click Elastic Load Balance.

Elastic IP FAQs 1 Product Consultation

c. In the load balancer list, locate the target load balancer and choose More

> Bind EIP in the Operation column.

d. In the Bind EIP dialog box, select the EIP to be bound and click OK.

4. Release the EIP that has been replaced. For details, see 4.

Scenario 3: Changing an EIP for a NAT Gateway

1. Assign an EIP. For details, see 2.

2. Modify an SNAT rule.

For details about how to modify an SNAT rule, see Modifying an SNAT Rule. In the EIP area, select the newly assigned EIP and deselect the original EIP (ensure that the deselected EIP belongs to the IP address range on Telefonica Open Cloud).

Figure 1-3 Selecting the newly assigned EIP

3. Modify a DNAT rule.

For details about how to modify a DNAT rule, see Modifying a DNAT Rule. In the EIP area, select the newly assigned EIP (ensure that the original EIP belongs to the IP address range on Telefonica Open Cloud).

Elastic IP FAQs 1 Product Consultation

Figure 1-4 Selecting the newly assigned EIP

4. Release the EIP that has been replaced. For details, see 4.

1.13 What Are the Dierences Between Shared Data Package and Shared Bandwidth?

Shared data package and shared bandwidth are two dierent products.

Table 1-1

Aspect

Customer All customers Medium- and large-scale

Feature After a shared data package takes

Dierences between shared data package and shared bandwidth

Shared Data Package Shared Bandwidth

customers

Multiple pay-per-use EIPs can eect, EIPs billed by trac will use the shared data package rst. After the shared data package is used up, the EIPs will be billed by trac on a pay-per-use basis.

A shared data package is more

cost-eective than billing by trac on the yearly/monthly

basis.

be added to a shared

bandwidth.

Shared bandwidth can be

billed by bandwidth or by 95th

percentile bandwidth

(enhanced).

Usage method

A shared data package takes eect immediately after being purchased and you do not need to perform any congurations.

After purchasing a shared

bandwidth, you need to add

EIPs to the shared bandwidth.

Elastic IP FAQs 1 Product Consultation

1.14 Do I Need to Congure a Shared Data Package for Use After It Is Purchased?

No.

A shared data package takes additional operations are required. If you have subscribed to pay-per-use EIPs using bandwidth billed by trac in a region and buy a shared data package in the same region, the EIPs will use the shared data package.

eect immediately after being purchased and no

1.15 What Should I Do If I Cannot Find My Purchased EIP on the Management Console?

Symptom

After I logged in to the management console, I could not

Possible Cause

● Your EIP is not in the current region. For details, see EIP Not in the Current

Region.

● Your EIP was released because it was expired but was not renewed. For details, see EIP Was Released.

EIP Not in the Current Region

nd my purchased EIP.

Method 1

1. Log in to the management console.

2. Change the region to the one that your EIP resides.

Figure 1-5 Changing a region on the management console homepage

Method 2

1. Log in to the management console.

2. On the management console homepage, click View Resources in All Regions under My Resources.

Elastic IP FAQs 1 Product Consultation

Figure 1-6 View Resources in All Regions

EIP Was Released

Yearly/monthly EIPs will be released if they are expired and have not been renewed.

If you need to buy an EIP and bind it to a cloud resource, refer to Assigning an

EIP.

If you want to retrieve an EIP that you have released, refer to How Do I Assign or

Retrieve a

Specic EIP?

NO TE

Elastic IP FAQs 2 Billing and Payments

2 Billing and Payments

2.1 How Is an EIP Billed?

EIPs can be billed on a yearly/monthly or pay-per-use basis.

Table 2-1 EIP billing details

Billing Mode

Yearly/ Monthly

Pay-per-use Bandwidth EIP retention fee is not

● "Not included" indicates that the fee will not be included in the bill. "Included" indicates that the fee will be included in the bill.

● For details about the EIP pricing, see Product Pricing Details.

Billed By EIP Retention Fee Bandwidth

Price

Bandwidth - Included Not

Included Not

included if the EIP is

Trac Not

bound to an ECS, BMS, or load balancer.

EIP retention fee is included if the EIP is unbound but not released.

included

Public Network

Trac

Price

included

Included

NO TE

Elastic IP FAQs 2 Billing and Payments

2.2 How Do I Change the Billing Mode?

Changing the Billing Mode from Pay-per-Use to Yearly/Monthly

You can change the billing mode of pay-per-use EIPs and shared bandwidth billed by bandwidth to yearly/monthly. After the change is successful, the new billing mode will take

You can change the billing mode on the EIP console. Do as follows to change the billing mode of an EIP from pay-per-use to yearly/monthly.

The billing mode of an EIP that is billed by trac on a pay-per-use basis cannot be directly changed to yearly/monthly. Change the EIP to be billed by bandwidth and then change its billing mode to yearly/monthly.

1. Log in to the management console.

2. Under Network, click Elastic IP.

3. On the displayed page, search for the pay-per-use EIP whose billing mode is to be changed.

4. Locate the row that contains the target EIP and click Change Billing Mode in the Operation column.

eect immediately.

Figure 2-1 Changing the billing mode on the EIP console

5. Click Yes.

6. Set specications.

Figure 2-2 Setting specications

Elastic IP FAQs 2 Billing and Payments

7. Click Submit and Pay.

You can also select multiple EIPs and click Change Billing Mode above the EIP list to change all the EIP billing modes at the same time.

Changing the Billing Mode from Yearly/Monthly to Pay-per-Use

The billing mode of yearly/monthly EIPs and shared bandwidth can be changed to pay-per-use. The new billing mode takes eect only after the required duration of the yearly/monthly billing mode expires.

The billing mode of an EIP can be changed from yearly/monthly to pay-per-use in the billing center. Do as follows to change the billing mode of an EIP from yearly/ monthly to pay-per-use:

1. Log in to the management console.

2. Choose Billing > Renewal.

Figure 2-3 Renewal

3. In the search box on the right, search for the EIP whose billing mode you want to change.

4. Locate the row that contains the target EIP and click Change to Pay-per-Use

After Expiration in the Operation column.

Figure 2-4 Changing the billing mode to pay-per-use

5. In the page that is displayed, click the Change to Pay-per-Use button.

Figure 2-5 Conrming the change

NO TE

Elastic IP FAQs 2 Billing and Payments

The EIP remains the same after the billing mode is changed.

2.3 How Do I Change the Bandwidth Billing Option from Bandwidth to Bandwidth?

● The billing option can be changed only when the billing mode is Pay-per-use. For details, see Modifying EIP Bandwidth.

● A yearly/monthly resource can only be billed by bandwidth.

Trac or from Trac to

NO TE

Elastic IP FAQs 3 EIP Binding and Unbinding

3 EIP Binding and Unbinding

3.1 How Do I Access an ECS from the Internet After an EIP Is Bound to the ECS?

Each ECS is automatically added to a security group after being created to ensure its security. The security group denies access (except TCP trac from port 22 through SSH to the Linux OS and TCP trac from port 3389 through RDP to the Windows OS). To allow external access to ECSs in the security group, add an inbound rule to the security group.

You can set Protocol to TCP, UDP, ICMP, or All as required on the page for creating a security group rule.

● If the ECS needs to be accessible over the Internet and the IP address used to access the ECS over the Internet has been does not need to be accessible over the Internet, set Source to the IP address range containing the IP address that is allowed to access the ECS over the Internet.

● If the ECS needs to be accessible over the Internet and the IP address used to access the ECS over the Internet has not been recommended that you retain the default setting 0.0.0.0/0 for Source, and then set Port Range to improve network security.

● Allocate ECSs that have groups.

The default source IP address 0.0.0.0/0 indicates that all IP addresses can access ECSs in the security group.

dierent Internet access policies to dierent security

trac from the Internet by default

congured on the ECS, or the ECS

congured on the ECS, it is

3.2 How Do I Access the Internet Using an EIP Bound to an Extension NIC?

1. After an EIP is bound to an extension NIC, log in to the ECS and run the route command to query the route.

NO TE

Elastic IP FAQs 3 EIP Binding and Unbinding

You can run route --help to learn more about the route command.

Figure 3-1 Viewing route information

2. Run the ifcong command to view NIC information.

Figure 3-2 Viewing NIC information

3. Congure the extension NIC to enable access to the Internet through the extension NIC by default.

a. Run the following command to delete the default route of the primary

NIC:

route del 0.0.0.0 192.168.11.1 dev eth0

This operation will interrupt ECS communication. It is recommended that you perform the

conguration by following step 4.

b. Run the following command to congure the default route for the

extension NIC:

route add default gw 192.168.17.1

4. Congure Internet access from the extension NIC based on your destination address.

Elastic IP FAQs 3 EIP Binding and Unbinding

Run the following command to congure access to a specied network segment (for example,

You can congure the network segment as required.

route add -net xx.xx.0.0 netmask 255.255.0.0 gw 192.168.17.1

xx.xx

.0.0/16) through the extension NIC:

3.3 Can I Bind an EIP to an ECS, to Another ECS?

Yes.

Unbind the EIP from the ECS. For details, see Unbinding or Releasing an EIP.

Then, bind the EIP to the target ECS. For details, see Binding an EIP to Cloud

Resources.

Helpful Links

Change the EIP associated with an ECS. For details, see Changing an EIP.

3.4 Can Multiple EIPs Be Bound to an ECS?

Scenarios

An ECS can be bound with multiple EIPs, though this recommended.

To bind multiple EIPs, you must manually caution when you perform this operation.

Conguration Example

Table 3-1 lists ECS congurations.

Table 3-1 ECS congurations

Parameter

Name ecs_test

Image CentOS 6.5 64bit

EIP 2

Primary NIC eth0

Secondary NIC eth1

conguration is not

congure routing policies. Exercise

Conguration

Example 1:

If you are required to access public network 11.11.11.0/24 through standby NIC eth1, perform the following operations to

1. Log in to the ECS.

congure a routing policy:

Elastic IP FAQs 3 EIP Binding and Unbinding

2. Run the following command to congure a routing policy:

ip route add 11.11.11.0/24 dev eth1 via 192.168.2.1

In the preceding command, 192.168.2.1 is the gateway IP address of standby NIC eth1.

Example 2:

Based on example 1, if you are required to enable routing for default public network congure a routing policy:

1. Log in to the ECS.

2. Run the following command to delete the default route:

3. Run the following command to

trac through standby NIC eth1, perform the following operations to

ip route delete default

congure a new default route:

ip route add 0.0.0.0/0 dev eth1 via 192.168.2.1

In the preceding command, 192.168.2.1 is the gateway IP address of standby NIC eth1.

3.5 Can I Bind an EIP to a Cloud Resource in Another Region?

No. EIPs can only be bound to cloud resources within the same region. For example, an EIP in the CN North-Beijing1 region cannot be bound to a resource in the CN North-Beijing4 region.

Elastic IP FAQs 4 Bandwidth

4 Bandwidth

4.1 What Is the Bandwidth Size Range?

The bandwidth ranges from 1 Mbit/s to 2000 Mbit/s.

The bandwidth in regions LA-Mexico City1 and LA-Sao Paulo1 ranges from 1 Mbit/s to 1000 Mbit/s.

4.2 How Do I Increase a Bandwidth to Be More Than 300 Mbit/s?

Symptom

The EIP billed by

Solution

Currently, the EIP billed by trac can be increased to a maximum of 300 Mbit/s. If a higher bandwidth is required, you need to change the EIP to be billed by bandwidth. Then, your bandwidth can be increased to a maximum of 2000 Mbit/s.

If your bandwidth usage is high, billing by bandwidth is more billing by trac. For details, see Modifying EIP Bandwidth.

trac cannot be increased to be more than 300 Mbit/s.

cost-eective than

4.3 What Bandwidth Types Does the VPC Service Support?

The VPC service supports dedicated bandwidth and shared bandwidth. The dedicated bandwidth can only be used by one EIP, whereas the shared bandwidth can be used by multiple EIPs.

Elastic IP FAQs 4 Bandwidth

4.4 How Do I Buy a Shared Bandwidth?

1. Log in to the management console.

2. On the console homepage, under Network, click Virtual Private Cloud.

3. In the navigation pane on the left, choose Elastic IP and Bandwidth > Shared Bandwidths.

4. In the upper right corner, click Buy Shared Bandwidth. On the displayed

congure parameters as prompted to buy a shared bandwidth.

page,

4.5 Is There a Limit to the Number of EIPs That Can Be Added to Each Shared Bandwidth?

A maximum of 20 EIPs can be added to each shared bandwidth. If you want to add more EIPs to each shared bandwidth, submit a service ticket to request a quota increase.

4.6 What Are the

Dierences Between a Dedicated Bandwidth and a Shared Bandwidth? Can a Dedicated Bandwidth Be Changed to a Shared Bandwidth or the Other Way Around?

Dedicated bandwidth: The bandwidth can only be used by one EIP and the EIP can only be used by one cloud resource, such as an ECS and a NAT gateway.

Shared bandwidth: The bandwidth can be shared by multiple EIPs. You can add multiple pay-per-use EIPs to the bandwidth. Adding an EIP to or removing an EIP from a shared bandwidth does not

A dedicated bandwidth cannot be changed to a shared bandwidth or the other way around. However, you can purchase shared bandwidth for pay-per-use EIPs.

● After an EIP is added to a shared bandwidth, the EIP will use the shared bandwidth.

● After an EIP is removed from the shared bandwidth, the EIP will use the dedicated bandwidth.

aect running services.

4.7 What Are Inbound Bandwidth and Outbound Bandwidth?

Inbound bandwidth: refers to the bandwidth consumed when data is transferred from the Internet to HUAWEI CLOUD. For example, resources are downloaded from the Internet to ECSs in the cloud.

Outbound bandwidth: refers to the bandwidth consumed when data is transferred from HUAWEI CLOUD to the Internet. For example, the ECSs in the cloud provide

NO TE

Elastic IP FAQs 4 Bandwidth

services accessible from the Internet and external users download resources from the ECSs.

Figure 4-1 Inbound bandwidth and outbound bandwidth

HUAWEI CLOUD only bills for the outbound bandwidth.

Inbound and outbound bandwidths have been adjusted as follows since July 31, 2020 00:00:00 GMT+08:00:

● If your purchased or modied bandwidth is less than or equal to 10 Mbit/s, the inbound bandwidth will be 10 Mbit/s, and the outbound bandwidth will be the same as the purchased or modied bandwidth.

● If your purchased or and the outbound bandwidth will be the same as the purchased or modied bandwidth.

modied bandwidth is greater than 10 Mbit/s, both the inbound

4.8 How Do I Know If My Used Bandwidth Exceeds the Limit?

Symptom

The bandwidth size the upper limit of the outbound bandwidth. If web applications that depend on the Internet freeze, check whether the dedicated bandwidth of the EIP bound to the ECS is greater than the

If the bandwidth exceeds the congured bandwidth size, packet loss may occur. To ensure normal service running, it is recommended that you monitor the bandwidth.

Troubleshooting

The following fault causes are sequenced based on their occurrence probability.

If the fault persists after you have ruled out a cause, check other causes.

congured when you buy a dedicated or shared bandwidth is

congured bandwidth size.

Elastic IP FAQs 4 Bandwidth

Figure 4-2 Troubleshooting

Table 4-1 Troubleshooting

Possible Cause Solution

System processes leading to high bandwidth

Improper Cloud Eye alarm rules

EIP connection failure See Why Does Internet Access Fail Even If My ECS Is

See System Processes Leading to High Bandwidth

See Improper Cloud Eye Alarm Rules

Bound with an EIP?

System Processes Leading to High Bandwidth

If system processes leading to excessively high bandwidth or CPU usage, your ECS will run slowly or be inaccessible unexpectedly

You can visit the following links to locate the processes that lead to excessively high bandwidth or CPU usage, and optimize or stop the processes.

● Troubleshooting High Bandwidth or CPU Usage of a Windows ECS

● Troubleshooting High Bandwidth or CPU Usage of a Linux ECS

Improper Cloud Eye Alarm Rules

When you create alarm rules for bandwidths on the Cloud Eye console, if the maximum outbound bandwidth or the alarm period is set too small, the system will send alarms indicating that the bandwidth exceeds the threshold too frequently.

You need to set an appropriate alarm rule based on your purchased bandwidth. For example, if your purchased bandwidth is 5 Mbit/s, you can create an alarm rule to report an alarm when the maximum outbound bandwidth is greater than or equal to 4.8 Mbit/s in three consecutive periods. You can also increase your

bandwidth.

Elastic IP FAQs 4 Bandwidth

1. Log in to the management console, under Management & Deployment, click

Cloud Eye. On the Cloud Eye console, choose Alarm Management > Alarm Rules.

Figure 4-3 Alarm Rules

2. Click Create Alarm Rule and congure an alarm rule to generate alarms when the bandwidth exceeds the limit.

Figure 4-4 Creating an alarm rule

Submitting a Service Ticket

If the problem persists, submit a service ticket.

4.9 Can I Increase My Bandwidth Billed on Yearly/ Monthly Basis and Then Decrease It?

An increased bandwidth takes eect in the rst billing cycle after the EIP is renewed. For details, see Modifying

EIP Bandwidth.

eect immediately. A decreased bandwidth will take

4.10 What Is the Relationship Between Bandwidth and Upload/Download Rate?

The bandwidth unit is bit/s, which is the number of binary bits transmitted per second. The unit of the download rate is byte/s, which is the number of bytes transmitted per second.

1 byte = 8 bits, that is, download rate = bandwidth/8

If the bandwidth is 1 Mbit/s, the actual upload or download rate is generally lower than 125 kByte/s (1 Mbit/s = 1,000 Kbit/s, upload or download rate = 1,000/8 = 125 kByte/s) in consideration of losses, such as computer performance, network device quality, resource usage, and network peak hours.

NO TE

Elastic IP FAQs 4 Bandwidth

4.11 What Are the Dierences Between Static BGP and Dynamic BGP?

The dierences between static BGP and dynamic BGP are as follows:

Table 4-2 Dierences between static BGP and dynamic BGP

Aspect Static BGP Dynamic BGP

Denition Static routes are manually

congured and must be

manually recongured any time the network topology or link status changes.

AssuranceWhen changes occur on a

network using static BGP, the manual conguration takes some time and high availability can't be guaranteed.

NOTE

If you select static BGP, your application system must have the disaster recovery capability.

Service availabilit y

99% 99.95%

Dynamic BGP provides automatic failover and chooses the optimal path when a network connection fails.

When a fault occurs on a carrier's link, dynamic BGP will quickly select another optimal path to take over services, ensuring service availability.

Currently, carriers in China that support dynamic BGP routing include China Telecom, China Mobile, China Unicom, China Education and Research Network (CERNET), National Radio and Television Administration, and Dr. Peng Group.

Billing Their price from least to most expensive: static BGP, dynamic BGP.

For details, see EIP Pricing Details.

For more information about service availability, see Huawei Cloud Service Level

Agreement.

Elastic IP FAQs 5 Connectivity

5 Connectivity

5.1 What Are the Priorities of the Custom Route and EIP If Both Are Congured for an ECS to Enable the ECS to Access the Internet?

The priority of an EIP is higher than that of a custom route.

5.2 Why Does Internet Access Fail Even If My ECS Is Bound with an EIP?

Symptom

You have an ECS that has an EIP bound, but the ECS cannot access the Internet.

Troubleshooting

Figure 5-1 shows the process for an ECS to access the Internet using an EIP.

Figure 5-1 EIP network diagram

Locate the fault based on the following procedure.

Elastic IP FAQs 5 Connectivity

Figure 5-2 Troubleshooting procedure

1. Step 1: Check Whether the ECS Is Running Properly

2. Step 2: Check Whether the Network Conguration of the ECS Is Correct

3. Step 3: Check Whether an EIP Has Been Assigned and Bound to the ECS

4. Step 4: Check Whether the EIP Is Bound to the Primary NIC of the ECS

5. Step 5: Check Whether Required Security Group Rules Have Been

Congured.

6. Step 6: Check Whether Trac from the ECS Subnet Is Blocked

Step 1: Check Whether the ECS Is Running Properly

Check whether the ECS is running properly.

If the ECS state is not Running, start or restart the ECS.

Elastic IP FAQs 5 Connectivity

Figure 5-3 ECS status

Step 2: Check Whether the Network Conguration of the ECS Is Correct

1. Check whether the ECS NIC has an IP address assigned.

If an ECS runs the Window OS, run the ipcong command.

2. Check whether the virtual IP address is correctly congured on the ECS NIC.

Log in to the ECS, and run the ifcong or ip address command to check the ECS NIC IP address. If the ECS NIC does not have an IP address congured, run a command to congure an IP address for the ECS NIC. For example, run the ip addr add

192.168.1.192/24 for the NIC.

Figure 5-4 Virtual IP address of a NIC

virtual IP address

eth0 command to congure IP address

Check whether the default route exists. If no default route exists, run the ip

route add command to add the default route.

Figure 5-5 Default route

Step 3: Check Whether an EIP Has Been Assigned and Bound to the ECS

Check whether an EIP has been assigned and bound to the ECS. (If the EIP has not been assigned, assign an EIP and bind it to the ECS.)

The ECS shown in Figure 5-6 has no EIP bound and only has a private IP address bound.

Figure 5-6 EIP status

Elastic IP FAQs 5 Connectivity

Step 4: Check Whether the EIP Is Bound to the Primary NIC of the ECS

Check whether the EIP is bound to the primary NIC of the ECS. If the EIP is not bound to the primary NIC of the ECS, bind it.

You can view the NIC details by clicking the NICs tab on the ECS details page. By default, the primary NIC as shown in the following gure.

Figure 5-7 Checking whether the EIP is bound to the primary NIC of the ECS

rst record in the list is the primary NIC and the EIP is bound to the

Step 5: Check Whether Required Security Group Rules Have Been

Congured.

For details about how to add security group rules, see Adding a Security Group

Rule.

If rules have not been congured, congure them based on your service requirements. (The remote IP address indicates the allowed IP address, and

0.0.0.0/0 indicates that all IP addresses are allowed.)

Step 6: Check Whether

Check whether trac ltering has been congured on the network ACL of the subnet used by the ECS NIC.

You can congure the network ACL on the VPC console, and make sure that the network ACL rules allow the

Trac from the ECS Subnet Is Blocked

trac from the ECS subnet.

Submitting a Service Ticket

If the EIP still fails to communicate with the Internet after performing the preceding steps, submit a service ticket.

Provide the following information to the technical support engineer.

Item

VPC CIDR block

Description Example Value

Required for gateway

conguration

Example: 10.0.0.0/16 N/A

Elastic IP FAQs 5 Connectivity

Item Description Example Value

VPC ID N/A Example:

120b71c7-94ac-45b8-8e d6-30aafc8fbdba

CIDR block of subnet 1 (can be the same as the VPC CIDR block)

ECS ID N/A N/A N/A

ECS IP address N/A Example:

ECS route information

EIP Required for the

EIP bandwidth Maximum

N/A Example: 10.0.1.0/24 N/A

192.168.1.192/24

N/A N/A N/A

Example: 10.154.55.175 N/A ECS to access the Internet

Example: 1 Mbit/s N/A bandwidth size used by the ECS to access the Internet

N/A

EIP ID N/A Example:

b556c80e-6345-4003-

b512-4e6086abbd48

5.3 Why Cannot an EIP Be Pinged?

Symptom

After I purchased an EIP and bound it to an ECS, pinging the EIP failed, or the ECS failed to access the Internet.

Fault Locating

The following fault causes are sequenced based on their occurrence probability.

If the fault persists after you have ruled out a cause, check other causes.

N/A

Elastic IP FAQs 5 Connectivity

Figure 5-8 Method of locating the failure to ping an EIP

Table 5-1 Method of locating the failure to ping an EIP

Possible Cause Solution

ICMP access rules are not added to the security group.

Ping operations are prohibited on the

rewall.

Ping operations are prohibited on the ECS.

Network ACL is associated.

A network exception occurred.

Routes are incorrectly congured if multiple NICs are used.

Add ICMP access rules to the security group. For details, see Checking Security Group Rules.

Allow ping operations on the rewall. For details, see

Checking Firewall Settings.

Allow ping operations on the ECS. For details, see

Checking Whether Ping Operations Have Been Disabled on the ECS.

If the VPC is associated with a network ACL, check the network ACL rules. For details, see Checking ACL Rules.

Use another ECS in the same region to check whether the local network is functional. For details, see Checking

Whether the Network Is Functional.

If the network is inaccessible due to an extension NIC, the fault is generally caused by incorrect route congurations. To resolve this issue, see Checking the

ECS Route Conguration If Multiple NICs Are Used.

Checking Security Group Rules

The ping operations use the ICMP protocol. Check whether the security group accommodating the ECS allows ICMP trac in the inbound direction.

1. Log in to the management console.

2. Click in the upper left corner and select the desired region and project.

3. Under Computing, click Elastic Cloud Server.

4. On the Elastic Cloud Server page, click the name of the target ECS.

The page providing details about the ECS is displayed.

Elastic IP FAQs 5 Connectivity

5. Click the Security Groups tab, expand the information of the security group, and view security group rules.

6. Click the security group ID.

The system automatically switches to the Security Group page.

7. On the Inbound Rules tab, click Add Rule. In the displayed dialog box, set required parameters to add an inbound rule.

Figure 5-9 Setting an inbound rule

Table 5-2 Security group rules

Transfer Direction

Inbound IPv4 ICMP/Any 0.0.0.0/0

8. Click OK to complete the security rule conguration.

Checking Firewall Settings

If a rewall is enabled on the ECS, check whether the rewall blocks the ping operations.

Linux

1. Run the following command to check the an example:

rewall-cmd --state

If running is displayed in the command output, the

Type Protocol/Port

Range

Source End

0.0.0.0/0 indicates all IP addresses.

rewall status, taking CentOS 7 as

rewall has been enabled.

2. Check whether there is any ICMP rule blocking the ping operations.

iptables -L

If the command output shown in Figure 5-10 is displayed, there is no ICMP rule blocking the ping operations.

Elastic IP FAQs 5 Connectivity

Figure 5-10 Checking rewall rules

If the ping operations are blocked by an ICMP rule, run the following commands to modify the rule for unblocking:

iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT

iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT

Windows

1. Log in to the Windows ECS, click the Windows icon in the lower left corner of the desktop, and choose Control Panel > Windows Firewall.

2. Click Turn Windows Firewall on or

o.

View and set the rewall status.

3. If the rewall is On, go to 4.

4. Check the ICMP rule statuses in the rewall.

a. In the navigation pane on the Windows Firewall page, click Advanced

settings.

b. Enable the following rules:

Inbound Rules: File and Printer Sharing (Echo Request - ICMPv4-In)

Outbound Rules: File and Printer Sharing (Echo Request - ICMPv4Out)

If IPv6 is enabled, enable the following rules:

Inbound Rules: File and Printer Sharing (Echo Request - ICMPv6-In)

Outbound Rules: File and Printer Sharing (Echo Request - ICMPv6Out)

Figure 5-11 Inbound Rules

Elastic IP FAQs 5 Connectivity

Figure 5-12 Outbound Rules

Checking Whether Ping Operations Have Been Disabled on the ECS

Windows

Enable ping operations using the CLI.

1. Start the Run dialog box. Enter cmd and press Enter.

2. Run the following command to enable ping operations:

netsh

Linux

Check the ECS kernel parameters.

1. Check the net.ipv4.icmp_echo_ignore_all value in the /etc/sysctl.conf Value 0 indicates that ping operations are allowed, and value 1 indicates that ping operations are prohibited.

2. Allow ping operations.

– Run the following command to temporarily allow the ping operations:

– Run the following command to permanently allow the ping operations:

Checking ACL Rules

By default, no ACL is VPC, check the ACL rules.

1. Check whether the subnet of the ECS has been associated with a network ACL.

If an ACL name is displayed, the network ACL has been associated with the ECS.

rewall set icmpsetting 8

le.

#echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all

net.ipv4.icmp_echo_ignore_all=0

congured for a VPC. If a network ACL is associated with a

NO TE

Elastic IP FAQs 5 Connectivity

Figure 5-13 Network ACL

2. Click the ACL name to view its status.

Figure 5-14 Enabled network ACL

3. If the network ACL is enabled, add an ICMP rule to allow trac.

Figure 5-15 Adding an ICMP rule

The default network ACL rule denies all incoming and outgoing packets. After the network ACL is disabled, the default rule still takes

Checking Whether the Network Is Functional

1. Use another ECS in the same region to check whether the local network is functional.

eect.

Use another ECS in the same region to ping the

aected EIP. If the EIP can be pinged, the VPC is functional. In such a case, rectify the local network fault and ping the

aected EIP again.

2. Check whether the link is accessible.

A ping failure is caused by packet loss or long delay, which may be caused by link congestion, link node faults, or heavy load on the ECS.

For details, see Troubleshooting a Ping Failure or Packet Loss Using a Link

Test.

NO TE

Elastic IP FAQs 5 Connectivity

Checking the ECS Route Conguration If Multiple NICs Are Used

The default route of an OS preferentially selects the primary NIC generally. If an extension NIC is selected in a route and the network malfunctions, this issue is generally caused by the incorrect route conguration.

● If the ECS has multiple NICs, check whether the default route is available.

a. Log in to the ECS and run the following command to check whether the

default route is available:

ip route

Figure 5-16 Default route

b. If the route is unavailable, run the following command to add it:

XXXX

ip route add default via

dev eth0

In the preceding command,

XXXX

species a gateway IP address.

● If the ECS has multiple NICs and the EIP is bound to an extension NIC, congure policy routing on the ECS for network communication with the extension NIC.

For details, see How Do I Congure Policy-Based Routing for ECSs with

Multiple NICs?

Checking Domain Name Resolution If the Domain Name Cannot Be Pinged

If the EIP can be pinged but the domain name cannot be pinged, the possible cause is that the domain name has not obtained an ICP occurred in domain name.

1. Check the ICP

ling of the domain name.

According to the Regulation on Internet Information Service of the People's Republic of China released by the Ministry of Industry and Information Technology (MIIT), publicly accessed websites cannot be hosted on servers in the Chinese Mainland until an ICP

ling number from the MIIT is obtained.

– If you want to use a server in the Chinese mainland to provide Internet

services, you need to submit an ICP ling request to the server provider to obtain an ICP

ling number for the domain name.

– If you use a server outside the Chinese mainland to provide Internet

services, no ICP ling is required.

2. Check the domain name resolution.

If your domain name has obtained an ICP ling number but the domain name resolution is not correctly congured, the domain name may fail to be pinged.

Switch to the DNS management console to view details about the domain name resolution.

ling number or an error

Elastic IP FAQs 5 Connectivity

3. Check the DNS server conguration.

If the system shows no server found after you ping a domain name, this issue may be caused by slow response from the DNS server. In such a case, see

Troubleshooting Slow Access of a Website Outside the Chinese Mainland over an ECS.

5.4 How Do I Unblock an EIP?

When the bandwidth of an EIP exceeds the threshold or an attack (usually a DDoS attack) occurs, the EIP will be blocked.

Blocked EIPs will be automatically unblocked 24 hours later if no attack occurs. It is recommended that you use Advanced Anti-DDoS to prevent attacks.

HUAWEI Elastic IP User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

1 Product Consultation

1.1 What Is a Quota?

1.4 Can an EIP That Uses Dedicated Bandwidth Be Changed to Use Shared Bandwidth?

1.5 Can I Bind an EIP to Multiple ECSs?

1.7 What Is the EIP Assignment Policy?

1.9 Does an EIP Change Over Time?

1.10 How Do I Query the Region of My EIPs?

1.11 Can a Bandwidth Be Used by Multiple Accounts?

1.12 How Do I Change an EIP for an Instance?

1.15 What Should I Do If I Cannot Find My Purchased EIP on the Management Console?

2 Billing and Payments

2.1 How Is an EIP Billed?

2.2 How Do I Change the Billing Mode?

3 EIP Binding and Unbinding

3.1 How Do I Access an ECS from the Internet After an EIP Is Bound to the ECS?

3.2 How Do I Access the Internet Using an EIP Bound to an Extension NIC?

3.3 Can I Bind an EIP to an ECS, to Another ECS?

3.4 Can Multiple EIPs Be Bound to an ECS?

3.5 Can I Bind an EIP to a Cloud Resource in Another Region?

4 Bandwidth

4.1 What Is the Bandwidth Size Range?

4.2 How Do I Increase a Bandwidth to Be More Than 300 Mbit/s?

4.3 What Bandwidth Types Does the VPC Service Support?

4.4 How Do I Buy a Shared Bandwidth?

4.5 Is There a Limit to the Number of EIPs That Can Be Added to Each Shared Bandwidth?

4.7 What Are Inbound Bandwidth and Outbound Bandwidth?

4.8 How Do I Know If My Used Bandwidth Exceeds the Limit?

4.9 Can I Increase My Bandwidth Billed on Yearly/ Monthly Basis and Then Decrease It?

4.10 What Is the Relationship Between Bandwidth and Upload/Download Rate?

5 Connectivity

5.2 Why Does Internet Access Fail Even If My ECS Is Bound with an EIP?

5.3 Why Cannot an EIP Be Pinged?

5.4 How Do I Unblock an EIP?