Re: [Linphone-users] Problem when using linphone with VPN

[Vladimir Kudrya]

Proper source address can be derived from local routing table with 
simple one-liner:

ip r get $SIP_SERVER_IP| sed -n 
's/.*src[[:space:]]\+\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\).*/\1/p'

On 2016-04-08 17:50, Vladimir Kudrya wrote:
> Perhaps some clues can be found in Twinkle's code. It somehow manages 
> to find the right address.
>
> 2016-04-08 17:08, Michael Richardson пишет:
> > Vladimir Kudrya <address@hidden> wrote:
> >      > Confirming this. It is hitting users connecting to office via 
> > VPN with
> >      > dynamic address allocation.
> >      > Dumping SIP traffic reveals that linphone sends wrong address 
> > (takes it from
> >      > ethernet device) when registering on SIP server, while the 
> > route to SIP
> >      > server lies clearly via ppp interface.
> >
> >      > Tricking linphone with 'nat_address' helps, but only until 
> > address gets
> >      > changed.
> >
> > Yeah.
> > We have this problem in many places: webrtc, IKE and a bunch of other 
> > places.
> > We really need a system call that says:
> >     "pretend to send this packet to target X, and tell me what source 
> > IP you'd use"
> >
> > Otherwise, applications wind up having to read all the interfaces and 
> > all the
> > ipv4,ipv6 and the ip rules, etc. and emulate all of the kernel 
> > stuff.  It's impossible.
> >
> > --
> > ]               Never tell me the odds!                 | ipv6 mesh 
> > networks [
> > ]   Michael Richardson, Sandelman Software Works        | network 
> > architect  [
> > ]     address@hidden  http://www.sandelman.ca/        |   ruby on 
> > rails    [
> >
> >
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