Thanks. I have tried this. But today it happen again. When I killed freeswith process and restart it, everything back to normal. So it does seem to be a DOS attack now. Or restarting fs won't make any difference. 

On Sat, Jun 13, 2015 at 1:04 AM, Stanislav Sinyagin <ssinyagin@gmail.com> wrote:

here are iptables rules which do a simple rate limiting for SIP
messages, probably this helps:
https://txlab.wordpress.com/2013/06/29/protecting-a-vpbx-from-dos-attacks/

On Sat, Jun 13, 2015 at 1:46 AM, Eric Ni <xyangni@gmail.com> wrote:
> Hi,
>
> I am using FreeSWITCH Version 1.4.18+git~20150312T185523Z~4eed221b69~64bit
> (git 4eed221 2015-03-12 18:55:23Z 64bit) on ubuntu 14.04, Linode VPS.
> It has been working fine for about 2 months. But recently it stopped working
> with CPU rate above 95% for several times. SIP client got 408 timeout error.
> I have to login system to kill the process and start over again.  Then it
> back to normal for a period. Checked the log file, it seem to be a sudden
> stop. Nothing special before the stop and completely no log starting from
> the issue. May I ask how I should handle this issue? Thanks.
>
> Regards,
> Eric
>

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