[SR-Users] provoke delay?

["Nicolas Rüger"]

Hello,

thank you. I see the problem with the worker processes now. I had a look at PIKE module and RATELIMIT module as well.

My idea was to delay the call WITHOUT sending any reply-message to the caller, as I wanted to save performance and I can identify suspicios users by a reputation that I compute before.

It seems the only way to do so, might be to store the INVITE information somewhere and keep on routing it again after a certain timeout.

Do you agree?

Regards,

Nicolas


> On 10/26/2010 05:09 PM, Alex Balashov wrote:
> > Pike or ratelimit modules may facilitate this; otherwise, no.
> >>
> >>      


> Hello, It is not a good design practice to do it synchronously, mainly 
> because the worker process will remain blocked for 30s . Imagine an 
> attacker sending 30 requests and DoS the whole server , because of the 
> limited number of worker process (not to mention that 30s delay means 
> retrasmits from the TM layer- so these need to be handled by tm before 
> the "sleep").
> 
> Anyway I wouldn't recommend a design like this.  As others suggested 
> pike and ratelimite (mostly ratelimit) will allow you to drop calls from 
> attackers. You could add a Retry-After header so to inform a normal UA 
> to retry the request after a number of seconds.
> 
> Marius

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