netdev - Max nr of tcp connections?

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Message-ID: <9948385e1002211018g5e50a006v96bea9ed4623fda8@mail.gmail.com>
Date:	Sun, 21 Feb 2010 19:18:41 +0100
From:	David Balažic <xerces9@...il.com>
To:	netdev@...r.kernel.org
Subject: Max nr of tcp connections?

Hi!

In theory, a tcp connection is identified by the tuple (src-addres,
src-port, dest-address, dest-port) so a lot of connections could exist
on on host.
But in practice I observed, that each outgoing connection is assigned
a new, unique local (src) port is assigned. If I try to create a new
connection
to a new host using a "used" local port, I get an error. (tested with
socat on kernel 2.4.30).

Does this mean only 64k (outgoing?) connections can exist at the same time?

What if the host is a (P)NAT router? Is it limited to max 64k outgoing
connections?

Regards,
David
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