Question

I have been trying to develop a peer to peer application that uses Micosoft s Peer to Peer Group library. Basing my work on the Creating a Group Chat Application acrticle on msdn. This works fine for local groups and will also work for global groups if I have a thrid party tunnel adapter installed such as the gogo6 client. However from a few things I have read it seems like I should be able to get things working through the Teredo tunnel adapter that comes built into Windows.

I have tried various things and can now access ipv6 only sites (eg ipv6.google.com) without the gogo6 tunnel running, but I can t seem to find any other peers in my global group through this method.

I have added a rule allowing trafic (including edge traversal) for the application in the Windows Firewall and also opened the following ports to incoming and outgoing trafic.

tcp 3587
udp 3540, 1900

From the samples I have read it seems like it should just work, but it doesn t. I did read that to use teredo in an application you had to specificaly enable it. The only way I have found to do this is when opening the socket, but the group api does all of that for you so I have no known way of controlling that.

Answer 1

Some Teredo clients are unreachable due to symmetric router problem. Teredo can work only behind 90% of routers. Gogo6 uses TSP which tunnels the packet to gogo6 infrastructure from where it reaches ipv6 internet.

Answer 2

I don t think Teredo supports IPv6 multicast. If the Peer to Peer Group library uses multicast under the hood, I think that s the problem. I could never find any confirmation that multicast is unsupported by Teredo; but in my own testing setsockopt(ADD_GROUP_MEMBERSHIP) would always fail when the interface ID was a Teredo interface.

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