Nortel 6220 User Manual page 166

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Note: The Public IP address is paired with the Public IP mask on the
Incoming Network Address Setup screen, as shown in the screenshots
below.
Public Port-- The public port for the service you wish to use. For a
discussion of the ports on which well known services run, see
http://www.tatanka.com/doc/technote/tn0081.htm.
Note: The public IP address must be the same for different local servers,
but the port will be different (e.g. different ports for SMTP, FTP, web
servers, etc.).
Private Server IP Address-- The local (private) IP address of the server
to which the request should be forwarded.
Private Server Port-- The local (private) port on the server to which the
request should be forwarded.
Set up IP/UDP/TCP Filters-- Select the Firewall option from the Setup
Tab to set up the IP TCP/UDP firewall (filtering) features.
IP Firewalls are used to restrict access between (sub) networks to certain
IP hosts, types of IP packets, or connections to certain ports. You can set
up the firewall to completely block all external IP traffic, or restrict
access to certain machines, ports, or packet types.
Note: You must select the Enable IP/TCP/UDP Security Filters
checkbox on the General Setup screen in order to access this screen.
Remote IP Address and Mask-- This column of the TCP/UDP Filter
List displays the IP Address and Subnet Mask of the (un-trusted) remote
sub network or machine for which you have chosen to set up this IP
UDP/TCP filter.
Local IP Address and Mask-- This column of the TCP/UDP Filter List
displays the IP Address and Subnet Mask of the local sub network or
machine that is being protected by this particular firewall filter.
WLAN Cable Access Point 6220 CSU NTPM99CA Rel 2.0 Issue 5 Dec 2005