[Users] openser and rtpproxy on multihomed host

[Ovidiu Sas]

Hi Alex,


It all depends on your routing table.  The OS will choose the src IP
for you unless you force it.

If you receive RTP traffic on one interface and want to send it from
the other one, then you need to run rtpproxy in bridge mode,
otherwise, you can run two rtpproxy in parallel (use -l to specify the
interface) and use openser 1.3 (the trunk version) to choose between
the two rtpproxy servers.

BTW, why do you want to run openSER/rtpproxy in this scenario?


Regards,
Ovidiu Sas

On 6/6/07, Alexander 'Leo' Bergolth <leo at strike.wu-wien.ac.at> wrote:
> On 06/06/2007 07:29 PM, Klaus Darilion wrote:
> > Alexander Bergolth wrote:
> >> I'm experiencing problems using openser and rtpproxy on a multihomed box
> >> (IP addresses are 137.208.89.45 and 137.208.89.65).
> >>
> >> The client (firewalled) contacts the server via the first IP address
> >> (137.208.89.45) but rtpproxy sometimes uses it's second IP
> >> (137.208.89.65) in the "c=" SDP-information. (See below.)
> >> However it _sends_ RTP packets from the _first_ IP address. Those
> >> packets will never pass through the firewall, of course, since the
> >> clients outgoing RTP traffic is sent to another IP address than the
> >> incoming traffic is hitting the firewall from.
> >>
> >> Is there a way to tell rtpproxy to use the same IP-address both for the
> >> c= SDP header and as source address?
> >
> > I guess you need the bridge mode of rtp proxy. Take a look at the "flags":
> > http://openser.org/docs/modules/devel/nathelper#AEN296
>
> Yes, I did already read it but I still didn't get the clue yet. :(
>
> In my configuration, there is no internal and external net, both IP
> addresses are in the same subnet using public IP addresses.
>
> What I'd like to achieve:
> The openser/rtpproxy server has some IP addresses and receives and sends
> SIP traffic on all of those interfaces.
> rtpproxy should simply use that local IP address for its RTP connection
> to the client from which the SIP traffic from the client came in.
>
> I've tried to use force_rtp_proxy("", "$Ri") but that leads to the
> SDP-line "c=$Ri". Maybe the nathelper-module doesn't support
> pseudo-variables?
>
> Cheers,
> --leo
> --
> e-mail   ::: Alexander.Bergolth (at) wu-wien.ac.at
> fax      ::: +43-1-31336-906050
> location ::: Computer Center | Vienna University of Economics | Austria
>
>
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