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Dynamic DNS Setup

This chapter discusses how to configure your ZyXEL Device to use Dynamic DNS.

14.1 Dynamic DNS Overview

Dynamic DNS allows you to update your current dynamic IP address with one or many
dynamic DNS services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You
can also access your FTP server or Web site on your own computer using a domain name (for
instance myhost.dhs.org, where myhost is a name of your choice) that will never change
instead of using an IP address that changes each time you reconnect. Your friends or relatives
will always be able to call you even if they don't know your IP address.

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CHAPTER 14

First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is
for people with a dynamic IP from their ISP or DHCP server that would still like to have a
domain name. The Dynamic DNS service provider will give you a password or key.

14.1.1 DYNDNS Wildcard

Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the
same IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use,
for example, www.yourhost.dyndns.org and still reach your hostname.

If you have a private WAN IP address, then you cannot use Dynamic DNS.

See Section 14.2 on page 198 for configuration instruction.

14.2 Configuring Dynamic DNS

To change your ZyXEL Device’s DDNS, click Advanced > Dynamic DNS. The screen
appears as shown.

See Section 14.1 on page 198 for more information.

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Figure 109 Dynamic DNS

The following table describes the fields in this screen.

Table 79 Dynamic DNS

LABEL DESCRIPTION

Dynamic DNS
Setup

Active Dynamic
DNS

Service Provider This is the name of your Dynamic DNS service provider.

Dynamic DNS
Type

Host Name Type the domain name assigned to your ZyXEL Device by your Dynamic DNS

User Name Type your user name.

Password Type the password assigned to you.

Enable Wildcard
Option

Enable off line
option

IP Address
Update Policy

Use WAN IP
Address

Select this check box to use dynamic DNS.

Select the type of service that you are registered for from your Dynamic DNS
service provider.

provider.
You can specify up to two host names in the field separated by a comma (",").

Select the check box to enable DynDNS Wildcard.

This option is available when Custom DNS is selected in the DDNS Type field.
Check with your Dynamic DNS service provider to have traffic redirected to a URL
(that you can specify) while you are off line.

Select this option to update the IP address of the host name(s) to the WAN IP
address.

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Table 79 Dynamic DNS (continued)

LABEL DESCRIPTION

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Dynamic DNS
server auto
detect IP
Address

Select this option only when there are one or more NAT routers between the ZyXEL
Device and the DDNS server. This feature has the DDNS server automatically
detect and use the IP address of the NAT router that has a public IP address.

Note: The DDNS server may not be able to detect the proper IP

address if there is an HTTP proxy server between the ZyXEL
Device and the DDNS server.

Use specified IP
Address

Apply Click Apply to save your changes back to the ZyXEL Device.

Cancel Click Cancel to begin configuring this screen afresh.

Type the IP address of the host name(s). Use this if you have a static IP address.

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201 Chapter 14 Dynamic DNS Setup

CHAPTER 15

Remote Management

Configuration

This chapter provides information on configuring remote management.

15.1 Remote Management Overview

Remote management allows you to determine which services/protocols can access which
ZyXEL Device interface (if any) from which computers.

Note: When you configure remote management to allow management from the WAN,

you still need to configure a firewall rule to allow access.

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You may manage your ZyXEL Device from a remote location via:

• Internet (WAN only)

• ALL (LAN and WAN)

• LAN only,

• Neither (Disable).

Note: When you choose WAN only or LAN & WAN, you still need to configure a

firewall rule to allow access.

To disable remote management of a service, select Disable in the corresponding Access
Status field.

You may only have one remote management session running at a time. The ZyXEL Device
automatically disconnects a remote management session of lower priority when another
remote management session of higher priority starts. The priorities for the different types of
remote management sessions are as follows.

1 Telnet

2 HTTP

15.1.1 Remote Management Limitations

Remote management over LAN or WAN will not work when:

• You have disabled that service in one of the remote management screens.

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• The IP address in the Secured Client IP field does not match the client IP address. If it
does not match, the ZyXEL Device will disconnect the session immediately.

• There is already another remote management session with an equal or higher priority
running. You may only have one remote management session running at one time.

• There is a firewall rule that blocks it.

15.1.2 Remote Management and NAT

When NAT is enabled:

• Use the ZyXEL Device’s WAN IP address when configuring from the WAN.

• Use the ZyXEL Device’s LAN IP address when configuring from the LAN.

15.1.3 System Timeout

There is a default system management idle timeout of five minutes (three hundred seconds).
The ZyXEL Device automatically logs you out if the management session remains idle for
longer than this timeout period. The management session does not time out when a statistics
screen is polling.

15.2 WWW

To change your ZyXEL Device’s World Wide Web settings, click Advanced > Remote
MGMT to display the WWW screen.

Figure 110 Remote Management: WWW

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The following table describes the labels in this screen.

Table 80 Remote Management: WWW

LABEL DESCRIPTION

Port You may change the server port number for a service if needed, however you must

Access Status Select the interface(s) through which a computer may access the ZyXEL Device

Secured Client IP A secured client is a “trusted” computer that is allowed to communicate with the

Apply Click Apply to save your settings back to the ZyXEL Device.

Cancel Click Cancel to begin configuring this screen afresh.

15.3 Telnet

P-660H/HW-D Series User’s Guide

use the same port number in order to use that service for remote management.

using this service.

ZyXEL Device using this service.
Select All to allow any computer to access the ZyXEL Device using this service.
Choose Selected to just allow the computer with the IP address that you specify to

access the ZyXEL Device using this service.

You can configure your ZyXEL Device for remote Telnet access as shown next. The
administrator uses Telnet from a computer on a remote network to access the ZyXEL Device.

Figure 111 Telnet Configuration on a TCP/IP Network

15.4 Configuring Telnet

Click Advanced > Remote MGMT > Tel ne t tab to display the screen as shown.

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Figure 112 Remote Management: Telnet

The following table describes the labels in this screen.

Table 81 Remote Management: Telnet

LABEL

Port You may change the server port number for a service if needed, however you must

use the same port number in order to use that service for remote management.

Access Status Select the interface(s) through which a computer may access the ZyXEL Device

using this service.

Secured Client IP A secured client is a “trusted” computer that is allowed to communicate with the

ZyXEL Device using this service.
Select All to allow any computer to access the ZyXEL Device using this service.
Choose Selected to just allow the computer with the IP address that you specify to

access the ZyXEL Device using this service.

Apply Click Apply to save your customized settings and exit this screen.

Cancel Click Cancel to begin configuring this screen afresh.

15.5 Configuring FTP

You can upload and download the ZyXEL Device’s firmware and configuration files using
FTP, please see the chapter on firmware and configuration file maintenance for details. To use
this feature, your computer must have an FTP client.

To change your ZyXEL Device’s FTP settings, click Advanced > Remote MGMT > FTP
tab. The screen appears as shown.

DESCRIPTION

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Figure 113 Remote Management: FTP

The following table describes the labels in this screen.

Table 82 Remote Management: FTP

LABEL DESCRIPTION

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Port You may change the server port number for a service if needed, however you must

Access Status Select the interface(s) through which a computer may access the ZyXEL Device

Secured Client IP A secured client is a “trusted” computer that is allowed to communicate with the

Apply Click Apply to save your customized settings and exit this screen.

Cancel Click Cancel to begin configuring this screen afresh.

15.6 SNMP

Simple Network Management Protocol (SNMP) is a protocol used for exchanging
management information between network devices. SNMP is a member of the TCP/IP
protocol suite. Your ZyXEL Device supports SNMP agent functionality, which allows a
manager station to manage and monitor the ZyXEL Device through the network. The ZyXEL
Device supports SNMP version one (SNMPv1) and version two (SNMPv2). The next figure
illustrates an SNMP management operation.

use the same port number in order to use that service for remote management.

using this service.

ZyXEL Device using this service.
Select All to allow any computer to access the ZyXEL Device using this service.
Choose Selected to just allow the computer with the IP address that you specify to

access the ZyXEL Device using this service.

Note: SNMP is only available if TCP/IP is configured.

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Figure 114 SNMP Management Model

An SNMP managed network consists of two main types of component: agents and a manager.

An agent is a management software module that resides in a managed device (the ZyXEL
Device). An agent translates the local management information from the managed device into
a form compatible with SNMP. The manager is the console through which network
administrators perform network management functions. It executes applications that control
and monitor managed devices.

The managed devices contain object variables/managed objects that define each piece of
information to be collected about a device. Examples of variables include such as number of
packets received, node port status etc. A Management Information Base (MIB) is a collection
of managed objects. SNMP allows a manager and agents to communicate for the purpose of
accessing these objects.

SNMP itself is a simple request/response protocol based on the manager/agent model. The
manager issues a request and the agent returns responses using the following protocol
operations:

• Get - Allows the manager to retrieve an object variable from the agent.

• GetNext - Allows the manager to retrieve the next object variable from a table or list
within an agent. In SNMPv1, when a manager wants to retrieve all elements of a table
from an agent, it initiates a Get operation, followed by a series of GetNext operations.

• Set - Allows the manager to set values for object variables within an agent.

• Trap - Used by the agent to inform the manager of some events.

15.6.1 Supported MIBs

The ZyXEL Device supports MIB II that is defined in RFC-1213 and RFC-1215. The focus of
the MIBs is to let administrators collect statistical data and monitor status and performance.

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15.6.2 SNMP Traps

The ZyXEL Device will send traps to the SNMP manager when any one of the following
events occurs:

Table 83 SNMP Traps

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TRAP #

0 coldStart (defined in RFC-1215) A trap is sent after booting (power on).

1 warmStart (defined in RFC-1215) A trap is sent after booting (software reboot).

6 whyReboot (defined in ZYXEL-

6a For intentional reboot: A trap is sent with the message "System reboot by

6b For fatal error: A trap is sent with the message of the fatal code if the

TRAP NAME DESCRIPTION

MIB)

15.6.3 Configuring SNMP

To change your ZyXEL Device’s SNMP settings, click Advanced > Remote MGMT >
SNMP. The screen appears as shown.

Figure 115 Remote Management: SNMP

A trap is sent with the reason of restart before
rebooting when the system is going to restart (warm
start).

user!" if reboot is done intentionally, (for example,
download new files, CI command "sys reboot", etc.).

system reboots because of fatal errors.

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