I don't know how to do this, so I figured I'd ask here... I've got a /29 from my DSL provider (great little local company) and a few servers I'd like to use as webservers behind the linux box I use as a router. Here's a quick diagram:
ISP ROUTER                        MY ROUTER                    ONE OF MY SERVERS
1.193           >>>>>>>>   1.198   |   2.217  >>>>>>>   2.218
                                          >>>  MY DESKTOPS

The thing is, that 2.x network is a public address block... so I'd like to be able to ping 2.218 from somewhere out in the internet cloud and get that box.

How do I configure my router box to listen for requests to that network and then route them through to it?