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642 DHCP server configuration

CAUTION

Although, Windows NT 4 also has the Vendor Encapsulation

Option (option code 43), do not use it to encode the

Voice Gateway Media Card information needed by the IP

Phones. Windows NT 4 enables only 16 bytes of data to be

encapsulated, which is not enough to encode all the information

needed.

Window NT 4’s DHCP server transmits any user-defined option

associated within a scope if the client requests it. It does not

have the ability to distinguish among different types of clients,

therefore it cannot make decisions based on this information. It

is impossible to create a client-specific IP address pool/scope.

Conﬁgure ISC DHCP Server

To configure ISC’s DHCP server, a text-based configuration process is

used. Configuration is done by adding definitions and declarations in

the dhcpd.conf file located at /etc/. Various "man" files are provided on

how to configure the server, configure the lease system, use options and

conditions, and run the server. Obtain the dhcpd.conf.man5 file in the

server directory and read it carefully. It provides explanations on relevant

topics, as well as the location of other man files to read for additional

information.

Conﬁgure ISC DHCP to work with the IP Phones

There is a particular format for encoding the Voice Gateway Media Card

information. In addition to the configuration statements provided, other

network and subnet declarations must also be included in the configuration

file.

As indicated in the beginning of this section, read the main files and use

<Example 1: Configuration files> to configure ISC’s DHCP server to work

with the IP Phones. Also, a copy of the configuration file used for this

project is provided at the end of this section.

Use the following procedure to configure the ISC’s DHCP to work with the

IP Phones.

Procedure 166

Conﬁguring ISC DHCP server

Step Action

1 Configure the server to identify a client correctly as an IP Phone

2001, IP Phone 2002, IP Phone 2004, or IP Phone 2007. This

is done using a match statement with a conditional if enclosed

inside a class declaration, as follows:

class "i2004-clients"{

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010