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[Tsvwg] Fwd: WGLC for Port Randomization starts now (April 1st)

Lars Eggert <lars.eggert@nokia.com> Mon, 11 May 2009 15:41 UTC

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Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Subject: [Tsvwg] Fwd: WGLC for Port Randomization starts now (April 1st)
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Forwarded with permission. Discussion is at http://thread.gmane.org/gmane.linux.network/127652/focus=127679

Begin forwarded message:

> From: Stephen Hemminger <shemminger@linux-foundation.org>
> Date: May 10, 2009 1:50:40 GMT+03:00
> To: "James M. Polk" <jmpolk@cisco.com>,         "Eggert Lars (Nokia- 
> NRC/Espoo)" 	<lars.eggert@nokia.com>
> Subject: Re: WGLC for Port Randomization starts now (April 1st)
>
> One issue with port randomization which is not covered in the draft,  
> but
> just showed up as a surprise to a Linux user is that port  
> randomization
> increases the frequency of port reuse (see Birthday Paradox).  For  
> correctly
> behaving endpoints, this no problem. But in this user's case there  
> was some
> old firewall (non-conforming middlebox), that rejected the new  
> connections.
> It is another case of a new protocol change breaks assumptions made  
> by intermediate
> devices.
>
> --

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