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DHCP
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Grandstream DHCP User manual

Grandstream Networks, Inc.
DHCP Options Guide Using Windows Server 2012
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Table of Contents
SUPPORTED DEVICES ................................................................................................. 5
INTRODUCTION ............................................................................................................. 6
ENVIRONMENT SETUP ................................................................................................. 7
Step 1: Install DHCP via Server Manager .......................................................................................... 7
Step 2: DHCP Server Basic Configuration ........................................................................................ 8
DHCP OPTIONS ................................ ................................ ................................ ........... 11
DHCP Option 2 (Time Offset) ............................................................................................................ 12
DHCP Option 42 (NTP Server) .......................................................................................................... 14
DHCP Option 66 (TFTP Server Name) .............................................................................................. 16
DHCP Option 43 (Vendor Specific Information) .............................................................................. 18
DHCP Option 12 (Host Name) ........................................................................................................... 20
DHCP Option 60 (Vendor Class Identifier) ....................................................................................... 21
DHCP Option 120 (SIP Server) .......................................................................................................... 23
DHCP Option 125 (Vendor-Identifying Vendor Options) ................................................................ 25
DHCP Option 132 (Vlan ID)................................................................................................................ 27
DHCP Option 133 (QoS Priority Level) ............................................................................................ 30
DHCP Option 150 (TFTP Servers List) ............................................................................................. 33
DHCP Option 160 (Configuration Server Address) ........................................................................ 36
DHCP Option 242 (Avaya IP Phones) ............................................................................................... 38
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Table of Figures
Figure 1: DHCP Role Installation .................................................................................................................. 7
Figure 2: DHCP Management ....................................................................................................................... 8
Figure 3: New Scope Wizard ........................................................................................................................ 9
Figure 4: IP Address Range .......................................................................................................................... 9
Figure 5: Completing the New Scope Wizard ............................................................................................. 10
Figure 6: Predefined Options ...................................................................................................................... 11
Figure 7 : Server Options ............................................................................................................................ 11
Figure 8: DHCP option 2 (Time offset) ........................................................................................................ 12
Figure 9: DHCP Discover Request for Option 2 ......................................................................................... 13
Figure 10: DHCP Offer Reply for the Option 2 ............................................................................................ 13
Figure 11: DHCP Option 42 ........................................................................................................................ 14
Figure 12: DHCP Discover Request for Option 42 ..................................................................................... 15
Figure 13: DHCP Offer Reply for the Option 42 .......................................................................................... 15
Figure 14: DHCP Option 66 ........................................................................................................................ 16
Figure 15: DHCP Discover Request for Option 66 ..................................................................................... 17
Figure 16: DHCP Offer Reply for the Option 66 .......................................................................................... 17
Figure 17: DHCP Option 43 ........................................................................................................................ 18
Figure 18: DHCP Discover Request for Option 43 ..................................................................................... 19
Figure 19: DHCP Offer Reply for the Option 43 .......................................................................................... 19
Figure 20: Host Name under web GUI ........................................................................................................ 20
Figure 21: DHCP Discover Advertisement for Option 12 ............................................................................ 20
Figure 22: DHCP Option 60 Predefinition ................................................................................................... 21
Figure 23: DHCP Discover Advertisement for Option 60 ............................................................................ 22
Figure 24: DHCP Option 120 ...................................................................................................................... 23
Figure 25: DHCP Discover Request for Option 120 ............................................................................... 24
Figure 26: DHCP Offer Reply for Option 120 .............................................................................................. 24
Figure 27: DHCP Option 125 ...................................................................................................................... 25
Figure 28: DHCP Discover Advertisement for Option 125 .......................................................................... 26
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Figure 29: Enable DHCP Option 132 under GXV3370 web GUI ................................................................ 27
Figure 30: Disable LLDP under GXV3370 web GUI ................................................................................... 27
Figure 31: DHCP Option 132 ...................................................................................................................... 28
Figure 32: DHCP Discover Request for Option 132 ................................................................................... 28
Figure 33: DHCP Offer Reply for Option 132 .............................................................................................. 29
Figure 34: Enable DHCP Option 133 under GXV3370 web GUI ................................................................ 30
Figure 35: Disable LLDP under GXV3370 web GUI ................................................................................... 30
Figure 36: DHCP Option 133 ...................................................................................................................... 31
Figure 37: DHCP Discover Request for Option 133 ................................................................................... 31
Figure 38: DHCP Offer Reply for Option 133 .............................................................................................. 32
Figure 39: DHCP Option 150 under the IP Phone web interface ............................................................... 33
Figure 40: DHCP Option 150 ...................................................................................................................... 34
Figure 41: DHCP Discover Request for Option 150 ................................................................................... 34
Figure 42: DHCP Offer Reply for Option 150 .............................................................................................. 35
Figure 43: DHCP Option 160 under the IP Phone web interface ............................................................... 36
Figure 44: DHCP Option 160 ...................................................................................................................... 36
Figure 45: DHCP Discover Request for Option 160 ................................................................................... 37
Figure 46: DHCP Offer Reply for Option 160 .............................................................................................. 37
Figure 47: DHCP Option 242 ...................................................................................................................... 38
Figure 48: DHCP Discover Request for Option 242 ................................................................................... 39
Figure 49: DHCP Offer Reply for Option 242 .............................................................................................. 39
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SUPPORTED DEVICES

Following table shows Grandstream products supporting DHCP Options:
DHCP
Options
Grandstream Models
GXP16XX
GXP17XX
GXP21XX
GVC320X
GAC2500
GXV33XX
GXW42XX
HT8XX
DP75X
Option 2
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Option 12
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Option 42
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Option 43
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Option 60
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Option 66
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Option
120
✓ ✓ ✓ ✓ ✓ ✓ ✗ ✓ ✓
Option
125
✓ ✓ ✗ ✓ ✓ ✓ ✓ ✓ ✓
Option
132
✗ ✗ ✗ ✗ ✗ ✓ ✗ ✗ ✗
Option
133
✗ ✗ ✗ ✗ ✗ ✓ ✗ ✗ ✗
Option
150
✓ ✓ ✓ ✗ ✗ ✗ ✗ ✗ ✗
Option
160
✓ ✓ ✓ ✓ ✓ ✓ ✗ ✓ ✓
Option
242
✗ ✗ ✗ ✓ ✓ ✓ ✗ ✗ ✗
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INTRODUCTION

Dynamic Host Configuration Protocol (DHCP) is a standardized network protocol used on Internet Protocol (IP) networks for dynamically distributing network configuration parameters, such as IP addresses for interfaces and services. With DHCP, network devices request IP addresses and networking parameters automatically from a DHCP server, reducing the need for a network administrator or a user to configure these settings manually.
DHCP servers can be configured to provide optional data that fully configures TCP/IP on a client. Some of
the most common DHCP option types configured and distributed by the DHCP server during leases include
default gateway, router, DNS, and WINS parameters.
This guide describes advanced DHCP options supported on Grandstream products. Administrators can use
these DHCP options for easy setup, to provide specific configuration per device model, synchronize time
with NTP servers, configure ACS server URL on devices and more…
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ENVIRONMENT SETUP

This chapter provides steps to setup a minimal test environment to run DHCP options described in this
guide using DHCP-server via server manager in Windows server 2012.
Administrators can use other Windows or Linux based DHCP servers at their convenience.
Note: This chapter can be skipped if a DHCP server supporting customizing options is already setup.

Step 1: Install DHCP via Server Manager

Before starting the role installation, make sure the computer has a static IP address. In this guide, we will
use Windows Server 2012 with static IP address: 192.168.1.1.
1. Launch the “Add Roles and features Wizard” from the Dashboard on Server Manager, and select “Role based or feature based installation”.
2. After choosing the server from the “server pool”, select DHCP server from the roles list and go through the installation steps.
3. The installation will be completed, and the last page of the wizard is the following figure:
Figure 1: DHCP Role Installation
4. Complete the steps required for the post-install configuration by clicking on “complete DHCP configuration”.
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Step 2: DHCP Server Basic Configuration

The first step in the installed DHCP server configuration is to create scopes (Ranges of IP addresses) the
administrator wants to lease out to clients.
1. Type: dhcpmgmt.msc Under “Windows Run” to open DHCP Management.
Figure 2: DHCP Management
2. Under the domain name, right click the “IPv4”, and then click on “New Scope” to open the New Scope wizard:
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Figure 3: New Scope Wizard
3. Enter the Name of the new scope and its description, and set the range of IP addresses to lease to DHCP clients. Leave the Length 24 by default and click Next.
Figure 4: IP Address Range
4. The administrator can configure a restricted range of IP addresses by entering the range in “Add exclusions” and setting the lease duration.
5. If you have a Router (Default gateway), set the router IP address and click Next.
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6. Set the domain Name of the DNS server and its IP address, and click Next.
7. Activate the scope by clicking “Yes, I want to activate this scope now”, and click Next.
8. Click on Finish to close the wizard.
Figure 5: Completing the New Scope Wizard
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DHCP OPTIONS

To configure the DHCP options, the method includes the following steps:
1. In the DHCP MMC, right-click on IPv4 and select “Set Predefined Options”.
Figure 6: Predefined Options
• Option Class: Set the Vendor Class serving to enhance DHCP functionalities (The admin can create a vendor class: DHCP MMC /IPv4 /Define Vendor Classes).
• Option Name: Set the option needed.
• Add: Increase the number of options by adding a new one.
• Edit: Modify a specific option.
• Value: Set the value of the chosen option.
2. Just after predefining the options and their values, click on “Server Options” to choose the options.
Figure 7 : Server Options
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DHCP Option 2 (Time Offset)

Description

DHCP option 2 informs the client about the time zone offset (in seconds).
A positive offset indicates a location east of the zero meridian and a negative offset indicates a location
west of the zero meridian.
Please refer to RFC2132 for more details.

Example

Figure 8: DHCP option 2 (Time offset)
In above example, GMT+1 was set as an offset value (one hour * 60 minutes/hour * 60 seconds/minute) = 3600.

Screenshots

Below screenshots of DHCP Discover/Offer for Option 2:
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