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DHCP server planning 29
Server 1 information using the same format as the IP Phone 2004. If
the Server 2 information is also present in the option, it is ignored.
•
DHCP Option 151. This option contains the IP address of the WLAN IP
Telephony Manager 2245. If Option 151 is not configured, the wireless
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 30).
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.