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184 Appendix B Troubleshooting WLAN IP Telephony installations
DHCP server options
The DHCP server options known to work in almost every situation are 3, 7,
42, 66, 128, 151, and 152:
• DHCP Option 3—the Default Gateway
•
DHCP Option 7—the Syslog Server
•
DHCP Option 42—the Time Server
• DHCP Option 60—the Class Identifier
•
DHCP Option 66—the IP address of the TFTP Server
•
DHCP Option 151—the IP address of the WLAN IP Telephony Manager
2245
•
DHCP Option 152—the IP address for the optional WLAN Application
Gateway 2246
DHCP options have the same format as the BOOTP vendor extensions.
Options can be fixed length or variable length. All options begin with a tag
byte, which uniquely identifies the option. Fixed length options without data
consist of only a tag byte. The value of the length byte does not include the
tag and length fields.
Options containing NVT ASCII data (ideally) do not include a trailing NULL;
however, the receiver of such options must be prepared to delete trailing
NULLs if they exist. The receiver must not require that a trailing NULL be
included in the data. With some variable-length options, the length field is a
constant but it still must be specified.
DHCP options
This section provides the IEEE definitions of the DHCP options. The term
SHOULD, as used in this section, is to be interpreted as described in
[RFC2119].
DHCP option 1: Subnet Mask. Length: 6 bytes
This option specifies the client’s subnet mask. If both the Subnet Mask and the router option are
specified in a DHCP reply, this option MUST be first.
00 01 02 03 04 05 06 07
Code
08 09 10 11 12 13 14 15
Length
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 01.02 Standard
Release 5.0 15 June 2007
Copyright © 2004-2007, Nortel Networks
.