Network Address Translation & Port Forwarding --------------------------------------------- When a customer has a server on their internal network behind the Pro which accepts connections from the outside internet (eg. mail server, web server), these will be denied by the router. To overcome this, we need to forward the port on the external IP to a port on an internal IP. This is due to the ADSL modems being assigned one IP Address, thus all internal servers that need to communicate with the internet have have port forwarding setup through that IP Address. Example ------- An SMTP server is running on a machine with an internal IP of 10.0.0.2. We would need to forward port 25 of the external IP address (given over PPP) to port 25 of 10.0.0.2. Telnet to the Pro (the default gateway 10.0.0.138 or otherwise specified in the network) or attach a crossover/console cable to the back of the Pro modem (the console port may have a red cover protecting it). To set up NAT, type the following: => nat [nat]=> create protocol = tcp inside_addr = 10.0.0.2 [inside_port] = 25 outside_addr = 0.0.0.0 [outside_port] = 25 [nat]=>save This will set up a port forward as per the above example. ***Please Note*** You must set the "outside_addr" to 0.0.0.0 The Alcatel Pro and NAT is not like Cisco/3Com/Netgear routers, the Pro recognises the 0.0.0.0 address and automatically maps the address to the external address. If you have successfully saved the the NAT table you should run a list command to make sure it is OK. This will display a list of forwarding rules: [nat]=>list Indx Prot Inside-address:Port Outside-address:Port Foreign-address:Port Flgs Expir State Control 1 6 10.0.0.2:25 0.0.0.0:25 0.0.0.0:0 template Other Ports ----------- If you have set up a webserver set up the NAT table to use port 80 Deleting NAT Entries -------------------- If you wish to delete the entry, type: => nat [nat]=>delete protocol = tcp inside_addr = 10.0.0.2 [inside_port] = 25 outside_addr = 0.0.0.0 [outside_port] = 25 [nat]=>save [nat]=>list [nat]=> Errors ------ Failed to create static NAT entry This is due to the Active Software Version you have on the Pro modem - it will be more than likely to be the following version: KHDSAA.132 You will need to upgrade to version KHDSAA.134 http://adsl.cutw.net/firmware-stpro/KHDSAA.134 Lalor McMahon 20010319