[Freeswitch-users] INVITE DoS Prevention

Steven Ayre steveayre at gmail.com
Wed Feb 23 19:02:27 MSK 2011

That's be within the Sofia stack and it had to acknowledge the INVITE with a
100 Trying otherwise the INVITE either resends or gives up the same as a
packet drop. Sleeping would mean keeping the INVITE in memory for longer
while starting the session before accepting/rejecting it, increasing memory
usage under a DOS attack and therefore making FS fall over faster. It'd also
increase the complexity of the code starting up a session while it puts new
invites aside and schedules them to be processed shortly afterwards. You
couldn't just do a sleep as it'd probably lock Sofia up. Doesn't seem worth

Iptables is a much better way of handling it. You can rate limit per-host.


On 23 February 2011 15:10, mazilo <Nabble at slickdeals.endjunk.com> wrote:

> jay binks wrote:
> > as for rate-limiting responses you can have iptables drop packets over X
> > number of invites per sec ...
> Just a thought. Perhaps, we should contemplate to add a feature on FS to
> set
> maximum of invites/sec/host. When the invites max out, add some sleep to
> slow down the response to the requested host. This will probably slow down
> the bot, especially if the bot is trying to hit a lot of FS servers out
> there.
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