Nortel 6220 User Manual page 110

serves as a simple firewall for incoming connections, since only traffic
initiated by an interior computer is permitted through the NAT.
Enable Incoming Network Address Translation
Select this checkbox if you will be using Incoming NAT to multiplex
traffic from the network to all the computers on the internal network.
Incoming Network Address Translations (NAT) is used to redirect
requests to servers in the local address space based on the port of the
request. If, for example, the client at local address 10.0.1.2 is serving
web pages, and a request comes to the access point on that port for a web
session, then the request will be forwarded to the web server on 10.0.1.2.
The server will respond with the web page to the address of the original
request.
Note: Incoming NAT only needs to be configured if servers in the local
(private) Address space needs to connect with clients in the global
(public) address space.
Enable DHCP Server
Select this checkbox if you are using the Secure Data Mode Bridge/
Router to provide DHCP information to the computers on your network.
Note: If you do not check this option, you will not be able to access the
DHCP Server screen.
Enable Secure Data Mode Radius Authentication
Select this checkbox if you wish to enable RADIUS authentication for
your Secure Data Mode stations.
Enable Network Address Translation Redirector
Select this checkbox if you wish to enable network address translation
(NAT) redirection, which is used to forward the packets sent to a
particular port number to a specified IP address, regardless of the original
destination IP address.
Access Control Buttons
The access control buttons determine how authentication is controlled.
There are three possible means of authentication control:
Disable - Selecting Disable turns off MAC authentication entirely.
Legacy Access Control - Selecting Legacy Access Control enables
access to the Access Control Setup screen and disables access to the
Advanced Authentication screen
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