[130784] in North American Network Operators' Group
Re: How to have open more than 65k concurrent connections?
daemon@ATHENA.MIT.EDU (Joel Jaeggli)
Thu Oct 14 12:53:38 2010
Date: Thu, 14 Oct 2010 09:53:21 -0700
From: Joel Jaeggli <joelja@bogus.com>
To: johndole@hush.ai
In-Reply-To: <20101014160323.895591B507A@smtp.hushmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
An incoming connection chews up an file descripter but does not require
an ephemeral port.
You can trivially have more that 65k incoming connections on a linux
box, but you've only got 64511 ports per ip on the box, to use for
outgoing connections.
I've seen boxes supporting more than a million connections with tuning
in the course of normal operation.
On 10/14/10 9:03 AM, johndole@hush.ai wrote:
> 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
>
>
