Nortel 6220 User Manual page 122

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Enable DHCP Server on Interface-- Select the interface on which you
wish to enable the DHCP server.
Set Up Outgoing Network Address Translation (NAT)
Outgoing Network Address Translation (NAT) allows multiple
computers to share a single IP address to connect to an IP network,
including the Internet. This allows homes, small businesses, and Internet
Service Providers to have Internet service for all of their computers
without having to pay for additional IP addresses. The NAT feature
serves as a simple firewall for incoming connections, since only traffic
initiated by an interior computer is permitted through the NAT.
In the screen shown below, when the client 10.0.1.1 wants to send data to
the Internet, the access point will take the packet, replace the return
address of 10.0.1.1 with 140.254.5.147, and then send the packet to the
Internet. When a response comes from the Internet, the access point
sends it to the correct client in the local address space.
Note: This screen is only available when the Enable Outgoing NAT
checkbox has been selected on the General Setup screen.
Note: You do not need to turn on Outgoing NAT if you are using
Incoming NAT, and vice versa. Incoming NAT only needs to be
configured if servers in the local (private) address space need to connect
with clients in the global (public) address space.
Figure 4-63
Outgoing NAT Setup window
WLAN Cable Access Point 6220 CSU NTPM99CA Rel 2.0 Issue 5 Dec 2005