From owner-freebsd-net@FreeBSD.ORG  Sun Jun 17 17:42:02 2007
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Date: Sun, 17 Jun 2007 11:41:33 -0600 (MDT)
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To: net@freebsd.org
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: 
Subject: Issue with huge numbers of connections
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Greetings,

I have a friend who is having problems with a service he's running.
He gets billions and billions of connections to this service a day.
Somewhere between 10^8 and 10^9 connections, he notices that his
servers lose the ability to accept new connections.  These are TCP
connections.

This is with FreeBSD 6.1R.  My first question is: does anybody know if
the fixes to -current/7.0 have fixed this?  Is there a fix that can be
back ported?  He's currently working around the problem by having a
number of different machines that reboot in a round robin fashion, but
would like a better solution.

Warner