Datagram source address question

[Pontus Lidman <pontus@lysator.liu.se>]

Hello,

I'm having some serious trouble with my IPv6 socket programming.

I create a datagram socket in my client application, and bind() it to the 
'any' address. The server binds its socket to an explicit global scope
IPv6 address.

The client sends a datagram to the server, with a source address of
::1, which is reasonable since the client and server executes on the same 
machine. The server responds to ::1 with a reply. Now the problems start:

Even though I used bind() to bind the server socket to an explicit
address, the source address of the server->client datagram turns out to be
::1, as determined from what recvfrom() puts in the from address argument.
So when the client in turn replies, it will send to ::1, which is an
address the server is not listening to, and the communication comes to a
halt.

Is this a bug in the IPv6 stack, or have I misunderstood something?

Thanks in advance,

Pontus

-- 
Pontus Lidman, pontus@lysator.liu.se, Software Engineer
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