[Serusers] Re: [Users] No rtpproxy when clients are behind the same nat

[Alfred E. Heggestad]

Hi Lada

I found your document about optimizing RTP proxy really useful!
thanks a lot.

my comment is that storing preferences per user about the network
topology is not very scalable. Also the user preference is stored
per user account, and not per location. you might have one user
with two UAs, one behind NAT and the other on the public internet


also can I ask that you update the sample ser.cfg to be more
aligned to the default ser.cfg from CVS, with the same named
routes etc? I found it very hard to "port" the RTPproxy ser.cfg
into the default ser.cfg ..

thanks!


/alfred


Ladislav Andel wrote:
> I just add, try to look at 
> http://www.iptel.org/ser/howtos/optimizing_the_use_of_rtp_proxy
> 
> Feel free to give me any feedback about the document. It is based on SER 
> Ottendorf.
> 
> Lada
> 
> Atle Samuelsen wrote:
>> Hi rafael,
>>
>> I might be wrong.. but it's REALLY hard to know if a user is behind the
>> same nat.. due to that :
>> on sip-proxy you see that user Alice and Bob come from the same IP, and
>> that they have the same "ip-range" in say contact.
>> you say "Oh, we see he's behind the same nat.."
>> but..
>>
>> you dont really know what other equitment the other user has behind
>> his nat. Say a user has 3 routers
>> router 1: 192.168.1.1 on "inside"
>> 193.212.1.10 on "outside"
>>
>> router 2: is conected to inside of router 1: 192.168.9.1 on "inside"
>> 192.168.1.2 on "outside"
>>
>> router 3: is concted to router 2's inside:
>> 192.168.1.1 on "inside"
>> 192.168.9.1 on "outside"
>>
>> one phone is now connected to router 3, and one to router 1.
>>
>> on router 3 the phone gets the "internal" ip: 192.168.1.2. on router 1 
>> the phone gets the ip 192.168.1.3
>>
>> the phone on router 1, can not send rtppackets to the phone on router
>> 3.. and router 3, can not send to router 1.. evenwhilethey are "looking"
>> to be behind the same nat.
>>
>> - Atle
>>
>> ps: if anybody has a working solutio for this, exept ice/turn/stun
>> whatever it's now called.. fel free to update me :)
>>
>> * Rafael J. Risco G.V. <rafael.risco at gmail.com> [070305 22:06]:
>>  
>>> Hi
>>> does anyone has a working example for this escenario?
>>>
>>> thanks
>>> rafael
>>>
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