Programmatic Router Port Mapping

[124256]

I'm working on some peer-to-peer stuff and I need to make this service available to those behind routers. Two things need to be accomplished:

1. Detect whether or not the user is behind a router.
2. If the user is behind a router, forward port X to the user's network IP.

I've seen this done using COM and C, but I can't translate into C#.

Thanks!

[Plater]

One way to possibly detect if they are behind a router is to see if their local IP address is the same as the ip visible to the outside world. Not a garuntee, but I'd say 9/10 times it will be accurate.

If you program is going to punch a hole through a router firewall, it's probably done with (insert protocol name I can't think of right now, "SNMP" I think?), which not all routers support and most people leave the feature turned off.