If ports need to be forwarded then this needs to be done in the router and the Mac OS firewall (if it is active).

To forward a port in the router the IP address of the computer needs to be static. You can do this by going into System Preferences -> Network -> Ethernet -> TCP/IP. Make sure "Configure IPv4:" is set to "Using DHCP with manual address". Then in "IP Address:" put in something that will coincide with the "Client IP Pool Starting Address" in the router (should be something like 192.168.1.101). Things might be a little different with different versions of OS X (I'm on 10.4.1)

Once the IP address of the computer is static go into NAT in the router and edit details of what ever NAT is selected (SUA Only or Full feature, if None is selected here then this email is completely useless to you so ignore it). Once in edit details you can forward all ports (not advisable due to security risk) by adding in the computers IP address in the top right hand text box. You can forward specific ports or a range of specific ports by adding in start and end points for the ports that you want to forward and by adding the IP address of the computer in the same row. To forward only 1 port simply use an "End Port No." that is identical to a "Start Port No.".

Took me a bit of time to figure out port forwarding on the Billion 5100. Hope this is helpful to you.
Ruben A. Franke

Hi, does anyone have details of how to configure a Billion 5100 ADSL router to work with iChat AV?

Thanks in advance for any tips you can provide. BTW I've read Apple's pages on port forwarding too...
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Andrew Nielsen  <mailto:[EMAIL PROTECTED]>