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DHCP server planning 37
handset performs a DNS lookup of the name SLNKSVP2, if Options 6
(DNS Server) and 15 (Domain Name) are configured.
•
DHCP Option 152. If an optional WLAN Application Gateway 2246 is
used in the system, its IP address can be specified with this option.
Each wireless handset effectively uses two IP addresses in the wireless
subnet: one for the physical wireless handset and a second alias IP address
that is used on the WLAN IP Telephony Manager 2245. When allocating
addresses in a subnet scope on the DHCP server, a contiguous block of IP
addresses as large as the number of wireless handsets supported must be
marked as unavailable for distribution for other uses by the DHCP server.
When multiple WLANs are connected to a single Nortel Wireless Security
Switch (WSS), the DHCP server can require specific configuration
modifications. For a specific WSS that is used for special DHCP
configuration requirements, see the WSS documentation.
The WLAN handsets support numerous DHCP extensions for assigning
various configuration options. The WLAN handsets supply a vendor class
identifier string, which in this case is Nortel-221x-A and Nortel-61xx-A.
The WLAN handsets do not accept these options from the DHCP server
encapsulated in a 43 Vendor Type option (which is the normal way vendor
classes work). Consequently, you do not define these options as part of a
vendor class on the DHCP server. Instead, you define them as new options
that are assigned using the native code numbers that you give them.
The WLAN handsets specifically request a list of options in the DISCOVER
message. The list of options (aside from the IP address and subnet mask)
needed by a WLAN handset is:
• Class Identifier (60)
•
TFTP Server (66)
•
Signaling Server Address and other parameters (43, 128, 144, 157,
191, or 251)
•
WLAN IP Telephony Manager 2245 Address (151)
•
WLAN Application Gateway 2246 Address (152)
For an example, see Figure 2 "Sample DHCP reservation showing assigned
parameters" (page 38).
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
.