On Monday 29 December 2003 11:43, Antony Gelberg wrote: > Hi all, > > I've dealt with quite a few LANs over the years. I'd like to try > something that I never have done before... > > I work with ADSL providers who allocate 5 public IP addresses (sometimes > 1) to a connection. If I have a LAN of, say, 20 workstations, I can use > NAT, and give them private addresses - no problem. > > I usually have an ADSL router / modem, hooked up to a Linux box > configured as a bridging firewall, which connects to a switch. > > But if they wanted to run a public email server as well, clearly that > needs a public IP address. Fine, but how does the routing aspect work? > Do I need to ditch the bridging configuration on the firewall and > reconfigure it as a router with 3 NICs? One connected to the WAN, one > to the private LAN switch, and one to the public server(s) switch?
There is ANOTHER way - one that I use. My router allows port forwarding. In other words a mail connection request on port 25 (SMTP) is forwarded by the router from its WAN side IP address to a designated IP address on the Lan side (10.0.10.100 in by case). I can do the same on other ports as well - so for instance to make the web site available externally I forward port 80 to the same machine. -- Alan Chandler [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
