[Freeswitch-users] A real puzzler for you guys... (perpetual registration causes denial of service.)

[Karl Vesterling]

Folks;

I give credit where credit is due, and I thank Brian K. West

What For:
This was found to be a compounded problem.  (Cisco was part of it...   
But the real problem was the linux kernel...)
Suffice it to say, without the kernel bug, the cisco bug wouldn't have  
been easily found.

What Kernel Bug:
It's a kernel bug that corrupted the sqlite database.
This caused Freeswitch to refuse the phones registration request.
This in turn caused the phones to re-register.
Problem was, with 10 phones, 6 lines each, perpetually registering on  
a 100Mbps LAN, well, you can imagine the overhead.
This created severe latency with Freeswitch, and manifested as dropped  
calls, one way audio, and the more phones you had, the worse the  
problem was.

Workaround for problem was to use a ramdisk (tmpfs)  for the database  
- (Big Thanks to bkw!)

So far, it's been 24 hours, and all systems are nice and stable.  (no  
negative reports yet (fingers crossed)).

Brian (and Folks);
If this is stable through Friday (and there's no reason to think it  
won't be),  I will take the time to document the problem, basic  
configuration,  and the workaround for the problem on the Wiki this  
weekend.

Best Regards,
Karl J. Vesterling
kjv at ken-ton.com
202-461-3231 x0

On Sep 14, 2009, at 9:22 AM, Brian West wrote:

> HAHA I couldn't have said this better!
>
> /b
>
> On Sep 14, 2009, at 8:17 AM, Anthony Minessale wrote:
>
>> The first hint was when the firmware rev began with the letters POS
>
>
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