netdev - Max nr of tcp connections?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html