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

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Message-ID: <20080317173021.28e6fd97@core>
Date:	Mon, 17 Mar 2008 17:30:21 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
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 Mon, 17 Mar 2008 11:43:28 -0500
Nebojsa Miljanovic <neb@...atel-lucent.com> wrote:

> Alan,
> thanks. With that additional INFO, I was able to find detailed description of
> this denial of service attack (attached below).
> Just to clarify. Having this port re-use check prevents folks from launching
> this attack as opposed to being victim of it?

Different issue. I can hijack a connection.

Imagine I have a server bound to *.5000, and someone is about to connect.
If on the server box I am able to bind and issue a connect outwards
matching the inbound connection I will get the connection not the server.
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