On Wed, 2009-05-13 at 23:25 +0200, Michael Thalmann wrote: > I have two sites connected via openvpn. Both routers are running > shorewall. Behind Network A is a SIP Phone which tries to register > with an Asterisk PBX in Network B. > I see in the log of the SIP device, that it is sending SIP packets > with its internal assigned address 192.168.1.11. The router at Network > B logs these SIP packets coming from the external IP address of Router > A, and not 192.168.1.11. > The strange thing is: other devices in net B have no trouble and are > not masqueraded in any way. Could that be a problem with udp vs. tcp? > Any advice I can try?
My guess is that you have a netfilter sip helper on the router for network A. Try removing it and see if that helps. This gets real tricky if you want the single gateway for network A to both help sip packets destined for the wider Internet and also not help packets destined for the other side of the VPN. I don't know if you can have the sip helper work for only some connections or not. b.
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