Ok my question is,

After I do an accept is there a way to tell if a socket has come thru a NAT.
My problem is I want to do multiple connections from behind the NAT,
and I need to know the local address(192.168...)so I can tell they are
comming from different clients. I know I could send that local address
as a message after connection, but I need it at connection, can I get
that from the socket somehow?

Here is the code I use to get the ipaddress of a socket, but that
gives me back the ip address of the router, not the local address.
	
sockaddr_in addr1;
sockaddr_in *addr2 = 0;
int nVal =  0;

int len = sizeof(SOCKADDR_IN);
nVal = getpeername(nSocket,(struct sockaddr *)&addr1,&len);

return inet_ntoa(addr1.sin_addr);

Thanks
David

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Request for Question Clarification by keystroke-ga on 18 Aug 2006 00:10 PDT

Do you actually need to do this?

It is the router's job to handle NAT work and IP conversions from LAN
to WAN IP addresses.

--Keystroke-ga

Yes I need to do this, my client connect to a server and creates a
client based off of the ip address.

Now if a person starts 2 clients from diff computers behind the
firewall, I will get 2 connections from the same ip address causing a
conflict.

Only programing in client or server is not enough.
You should see this page http://www.brynosaurus.com/pub/net/p2pnat/
If you want to soucercode you may touch me.