[Kamailio-Users] Dealing with REGISTER "retransmissions"

[Daniel-Constantin Mierla]

On 03/24/2009 07:03 PM, mayamatakeshi wrote:
> On Tue, Mar 24, 2009 at 6:43 PM, Klaus Darilion
> <klaus.mailinglists at pernau.at> wrote:
>   
>> try this one:
>> http://www.kamailio.org/docs/modules/devel/htable.html#id2454064
>>     
>
> Thanks. I can't use this right now as I'm still working with branch 1.4.
> I'll go with it when we migrate to a newer branch.
>   

if one really needs htable, then you can just copy from 1.5 to 1.4, 
compile&install. I am using it in may 1.4 deployments.

Cheers,
Daniel

>   
>> mayamatakeshi schrieb:
>>     
>>> Hello,
>>> we are running kamailio 1.4.
>>> Some days ago one of our subscribers SIP phone went crazy and
>>> bombarded our proxy with thousands of REGISTER requests. Actually, it
>>> didn't wait for any response of the proxy, it just kept sending
>>> REGISTER messages (same packet always). Since we are running with
>>> nonce_reuse disabled, it stalled the server due to "auth:challenge:
>>> failed to generate nonce".
>>> I don't have the whole figure but the packet capture I inspected
>>> showed that the terminal sent more than 200 thousand REGISTER messages
>>> in 15 seconds.
>>> We may not be able to replace those terminals at this moment. So to
>>> avoid this problem to happen again, we enabled nonce_reuse. However
>>> this only will solve the nonce problem but still we will have a lot of
>>> hits to database.
>>> So I was thinking, maybe I should create a transaction before sending
>>> the challenge so that REGISTER retransmissions would be absorbed. I
>>> was thinking in doing something like this:
>>>
>>>        if (!proxy_authorize("", "subscriber")) {
>>>                t_newtran();
>>>                proxy_challenge("", "0");
>>>                exit;
>>>        }
>>>       
>
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>   

-- 
Daniel-Constantin Mierla
SIP Router Masterclass - Kamailio (OpenSER) Training
http://www.asipto.com/index.php/sip-router-masterclass/