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From: Nebojsa Miljanovic <>
To: Alan Cox <>
Cc:, "Kittlitz,
	Edward (Ned)" <>,, "Polhemus,
	William (Bart)" <>
Subject: Re: SO_REUSEADDR not allowing server and client to use same port
Date: Thu, 13 Mar 2008 14:18:15 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <20080228201926.558c4e7c@core>

I would appreciate it if you could elaborate on the security issue. Can you
describe the simultaneous connect scenario?

We have a system we are migrating to Linux from Lynx. We have always had the
ability to re-use ports. We are wondering if this security issue is something we
should take seriously. Or, maybe it is not likely to be seen with our system
running well defined set of applications (i.e. not a PC where anybody could run


On 2/28/2008 2:19 PM, Alan Cox wrote:
>>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
> Think about what happens for simultaneous connect (that obscure little
> corner of the tcp/ip spec). Now think about what it means for security.
> ALan

  parent reply	other threads:[~2008-03-13 19:18 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-28 18:15 Nebojsa Miljanovic
2008-02-28 18:30 ` Phil Oester
2008-02-28 20:19 ` Alan Cox
2008-02-28 20:41   ` Willy Tarreau
2008-03-13 19:18   ` Nebojsa Miljanovic [this message]
2008-03-15 13:34     ` Alan Cox
2008-03-17 16:43       ` Nebojsa Miljanovic
2008-03-17 17:30         ` Alan Cox
2008-03-17 18:17           ` Nebojsa Miljanovic
2008-03-18  5:48             ` Willy Tarreau
2008-02-28 20:36 ` Willy Tarreau
2008-02-28 20:44   ` Nebojsa Miljanovic

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