gateway to gateway protocol Raw Socket documentation or Example ???

[SWJust]

I found out that the socket in C# can be set in an GGP mode, but what does
that mean, it is nessary for me to enter at mode where it is possible to
communicate with routers, because my application is going to work as an
software router, but i cannot find any documentation or examples of using
the GGP mode on the socket. Do any of you have any examples, or links to
documentation of this mode ???

I have to forward IP packagedes without destroying them, or altering the IP
header, can i just use rawsockets, show the header, make a lookup in my
routing table for the destination klient, or next router, and then use
sendTo and send the packagedes allong in the system, will the sendTo
function attach an new header, or alter the existing, because the original
communication between routers is based on Mac addresses, i am a little
puzzled if it is possible in C#.

THANKS

/Søren