OpenVPN Support Forum

Is it possible to make UPnP work over openvpn? I think the multicast part is what does not work. How do you do it, I have read a lot of misleading stuff out there...

Hello,

Yeah. Multicast. The one time I needed multicast over a vpn link, I ended up going with a bridged connection. I messed with using a routed connection for a couple weeks but to no avail. If you're not using Windows, you might want to play around with the new topology configuration settings. I'm pretty sure the limitation/problem is with the tun driver itself, though.

Anyway...

Good luck.

-Stephen

I couldn't make it work with tap. I don't know why, I couldn't even get the vpn part to work properly. Has anyone configured this and made it work?

Also I heard the openvpn folks are working up a fix for this problem. Is there any way to get the source code and try it out ahead of time?

With a linux client, might it just work with layer3? Do I need to add the multicast subnet to a route table or somewhere else? How? Details please I am totally stuck.

a tap vpn is the same as a tun one, unless you need a bridge
the only difference is using dev tap on both sides of the vpn, instead of dev tun
you need a bridge when you need layer2 to go to a lan behind the vpn endpoint... otherwise tap is fine.

i havnt heard of what you were saying, but weekly dev snapshots are available from ftp://ftp.secure-computing.net/pub/openvpn

I wish I knew what the problem with UPnP is exactly, and who was working on it. I think the only issue with UPnP is the ip multicast traffic. I have gotten a lot of misleading info on this topic. It seems to me that:


#1 - UPnP is all ip multicast ( not ethernet broadcast ), so you shouldn't need anything layer2, correct?

#2 - will ip multicast route correctly through the server? What is needed on a centos server to get the muticast routed correctly to the virtual adapter? What commands add the routes or whatever? Do we need a multicast routing daemon?

#3 - will ip multicast route correctly on a windows client? How to configure this part?

Hi!

Total newbie here. Just wanted to check whether UPNP support has been implemented or if there's any way to make it work when behind OpenVPN connection.

Thanks!