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How to configure the AT-AR450S Firewall using the Graphical User Interface (GUI) 9
C613-16011-00 REV A
13 February 2004
The policy options screen enables you to set the following options on each firewall policy:
Responding to pings.
Proxying ident requests.
Forwarding ICMP packets.
The respond to ping checkbox allows users on the Internet and on the private side of
the firewall to ping the router. The private interface will always respond to pings.
The enable ICMP forwarding checkboxes specifies which ICMP messages the router
will forward and respond to over the policy’s interfaces in both directions; Public-to-
Private AND Private-to-Public.
The ident proxy is a very specific feature that is required to enable successful sessions to
some external FTP and SMTP servers - those which send back an ident request to the
client before accepting the connection. The ident proxy checkbox enables the firewall to
respond to these requests on behalf of the client device on the Private side of the firewall.
Refer to the GUI help for more information.
Configuring firewall Network Address
Translation (NAT)
The next item in the Firewall submenu is NAT, or Network Address Translation.
Clicking NAT displays the screen shown in Figure 8, which allows you to view, add and
remove the configured Network Address Translations for your LAN.
Figure 8: An example of the Firewall NAT LAN screen
Each firewall policy appears as a separate tab in this window. You can apply NAT to
individual interfaces within both the LAN and DMZ interface groups.
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