[Kamailio-Users] Dealing with REGISTER "retransmissions"

[mayamatakeshi]

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.

>
> 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;
>>        }