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How to have open more than 65k concurrent connections?

daemon@ATHENA.MIT.EDU (johndole@hush.ai)
Thu Oct 14 12:03:31 2010

Date: Thu, 14 Oct 2010 12:03:23 -0400
To: nanog@nanog.org
From: johndole@hush.ai
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org

Hi,

I am somewhat new to networking. I have interest in running a 
Bittorrent tracker. I ran one for a bit, and my one Linux box 
running Opentracker gets overloaded. My connection is good, and 
most of it isn't being used. Just a lot of people connect, and use 
up all the 65k "free connections". I tried messing with the 
sysctls, but it didn't help too much (and just degraded the 
connection quality for everyone). It is not a malicious attack 
either as there is only a few connections per IP and they are 
sending proper Bittorrent tracker requests...

So what can I do? How can I have have open more than 65k concurrent 
connections on standard GNU/Linux?

Thanks for any ideas and suggestions.

-John



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