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DHCP Software Alternatives 4
Two DHCP software alternatives are common to Windows operating systems:
Windows NT
®
4.0 DHCP Server
Windows 2000
®
DHCP Server
Any other DHCP application may work.
It is the customer’s responsibility to install and configure the DHCP server correctly. This document
is limited to describing a generic administration that will work with the 4600 Series IP Telephones.
DHCP Generic Setup 4
Set up of a DHCP server involves the following phases:
1. Installing the DHCP server software according to vendor instructions.
2. Configuring the DHCP server with the following information:
IP addresses available for the 4600 Series IP Telephones.
Lease duration (Infinite is recommended).
The following DHCP options:
— Gateway (router) IP address(es) (Table 4-2, on page 4-6
, item 1). If more than one
address is listed, the total list may contain up to 127 total ASCII characters, with IP
addresses separated by commas with no intervening spaces.
— Subnet mask (Table 4-2, on page 4-6
, item 3).
— Option 6 (DNS server(s) address list). If more than one address is listed, the total list
may contain up to 127 total ASCII characters, with IP addresses separated by
commas with no intervening spaces. At least one address in Option 6 must be a valid,
non-zero, dotted decimal address - otherwise, DNS will fail.
— Option 15 (DNS Domain Name). This string should contain the domain name to be
used when DNS names in system parameters are resolved into IP addresses. This
domain name is appended to the DNS name before the 4600 IP Telephone attempts
to resolve the DNS address. Option 15 is necessary if you wish to use a DNS name
for the TFTP server; otherwise, you may specify a DOMAIN as part of TFTP
customization, as indicated in DNS Addressing
, on page 4-31.
— Option 66 (TFTP Server Name).
Microsoft DHCP servers support only dotted-decimal format for TFTP
addresses, not symbolic names. Option 66 need not be used if the TFTP
server is identified in the Site Specific Option string (Option 176). However, to
simplify configuration, we recommend that you use Option 66. If you use both
Option 66 and Option 176 to identify TFTP servers, the value(s) in Option 176
will override the value(s) in Option 66.