[Kamailio-Users] Having problems using RTPProxy to bridge internal/external networks

[Alex Balashov]

Klaus Darilion wrote:
> 
> 
> Alex Balashov wrote:
>> Alex Balashov wrote:
>>> Daniel-Constantin Mierla wrote:
>>>
>>>> IIRC, I use:
>>>>
>>>> if(dst_ip==private_ip)
>>>>       force_rtp_proxy("ocfaei");
>>>> else
>>>>       force_rtp_proxy("ocfaie");
>>>>
>>>> rtpproxy started with: -l external_ip/private_ip
>>>>
>>>> Probably is rtpproxy 1.1 -- cannot check right now.
>>>
>>> I just tried this and it works, from the point of view of SDP.  We 
>>> were already able to obtain this result.
>>>
>>> The problem is that the actual rtpproxy does not seem to forward the 
>>> packets that come into one interface toward the other, so no media is 
>>> exchanged.
>>>
>>
>> An additional note:  if I turn OFF /proc/sys/net/ipv4/ip_forward and 
>> then start the proxy in bridging mode, the following happens when it 
>> is invoked:
>>
>> DBUG:handle_command: received command "8725_4 UAIEc0,101 
>> 5f1690462d84b3814915b05f65c626bd at 208.52.173.7 208.52.173.7 11832 
>> as214288b6;1"
>> INFO:handle_command: new session 
>> 5f1690462d84b3814915b05f65c626bd at 208.52.173.7, tag as214288b6;1 
>> requested, type strong
>> Segmentation fault
>>
>> In other words, it seems to require ip_forward to be on in order to 
>> not crash, but when it is on, no packets are exchanged between the 
>> interfaces.
> 
> 
> That's strange, rtpproxy is in usermaode, thus the ip_forward setting 
> should not cause any influence.

That's what I thought too.  It does not call any kernel IP forwarding 
APIs.

But it seems to make a difference!

-- 
Alex Balashov - Principal
Evariste Systems
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