From: Eric Dumazet <eric.dumazet@gmail.com>
To: Chris Friesen <chris.friesen@genband.com>
Cc: netdev@vger.kernel.org
Subject: Re: any way to let host act as TCP server OR client on same IP/port?
Date: Wed, 13 Jul 2011 19:52:00 +0200 [thread overview]
Message-ID: <1310579520.2509.17.camel@edumazet-laptop> (raw)
In-Reply-To: <4E1DC83C.3020506@genband.com>
Le mercredi 13 juillet 2011 à 10:30 -0600, Chris Friesen a écrit :
> I've been asked an interesting question about TCP. We have some people
> that want to set up a TCP socket that can listen for connections on a
> given IP/port, but also initiate connections from that same IP/port.
> (Only one at a time, of course.)
>
> The TCP state machine seems to allow this (moving from LISTEN to
> SYN_SENT) but it's not a normal transition.
>
> Is there any way to do this using the socket API?
>
> I thought up a hack whereby we could use NFQUEUE to detect an incoming
> SYN and delay it while we call listen() on the socket. Is there any
> better way to do this?
Could you try SO_REUSEADDR, on both listener and connect attempt ?
next prev parent reply other threads:[~2011-07-13 17:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-13 16:30 any way to let host act as TCP server OR client on same IP/port? Chris Friesen
2011-07-13 17:52 ` Eric Dumazet [this message]
2011-07-13 18:05 ` Rick Jones
2011-07-13 19:16 ` Chris Friesen
2011-07-13 20:36 ` Rick Jones
2011-07-13 22:28 ` Chris Friesen
2011-07-14 14:55 ` Chris Friesen
2011-07-14 16:45 ` Rick Jones
2011-07-14 17:33 ` Chris Friesen
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