linux-kernel - Re: SO_REUSEADDR not allowing server and client to use same port

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Date:	Thu, 28 Feb 2008 10:30:54 -0800
From:	Phil Oester <kernel@...uxace.com>
To:	Nebojsa Miljanovic <neb@...atel-lucent.com>
Cc:	linux-kernel@...r.kernel.org,
	"Kittlitz, Edward \(Ned\)" <nkittlitz@...atel-lucent.com>,
	asweeney@...atel-lucent.com,
	"Polhemus, William \(Bart\)" <bpolhemus@...atel-lucent.com>
Subject: Re: SO_REUSEADDR not allowing server and client to use same port

On Thu, Feb 28, 2008 at 12:15:06PM -0600, Nebojsa Miljanovic wrote:
> Hello all,
> I have seen similar complaints about this issue before in the list archive, but
> I have not seen any resolution. So, I am posting the question again in hope of
> getting some replies.
> 
> Currently, Linux does not allow reuse of same local port for both TCP server and
> TCP client. I understand that there may be a need to prevent two servers from
> binding to the same local port, but having 1 server and 1 outgoing client use it
> should be allowed. Other Unix like operating systems do allow it. Further more,
> Linux SCTP socket API allows for this to happen. And, I can't imagine why this
> restriction would exists for TCP and not for SCTP.

You'd likely get better response by posting this on the netdev list.

Phil
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