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NAT 81
Connect the private interface of the VPN Router to the trusted side of
the network. Make sure that client DHCP traffic flows through the VPN
Router. If a network path around the VPN Router exists for the handsets
to get DHCP assignments, the routing requirements on the VPN Router
become much more complicated. To support such a scenario, you must
configure static routes on the public interface as well as inject those
routes into the routing protocol on the private interface. Therefore, Nortel
recommends that you do not use the network design shown in Figure 20
"Not recommended VoWLAN design" (page 81) as a design for the VPN
feature.
Figure 20
Not recommended VoWLAN design
If you deploy the VPN feature of the WLAN Handset 2212 in a mixed
network where WLAN Handsets 2211/2210s are also in use, the design
recommendation becomes a little more complex. If you place a WLAN IP
Telephony Manager in the subnet with the WLAN Handsets 2210/2211,
and place a WLAN IP Telephony Manager in the subnet with the VPN
Router to support the WLAN Handset 2212, admission control problems
for the telephony WLAN can occur. Each WLAN IP Telephony Manager
counts the number of their own devices placing calls over APs, but does
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
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