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Re: [tcpm] Tuning TCP parameters for the 21st century

Joe Touch <touch@ISI.EDU> Wed, 15 July 2009 23:51 UTC

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Date: Wed, 15 Jul 2009 16:50:54 -0700
From: Joe Touch <touch@ISI.EDU>
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To: Jerry Chu <hkchu@google.com>
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Subject: Re: [tcpm] Tuning TCP parameters for the 21st century
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Jerry Chu wrote:
> On Wed, Jul 15, 2009 at 7:25 AM, Joe Touch<touch@isi.edu> wrote:
> 
> 
> Jerry Chu wrote:
> ...
>>>>> We're taking one more look at T/TCP as well (probably need to start a different
>>>>> mail thread on T/TCP too).
> T/TCP is deprecated due to a fairly large security issue that has not
> been solved, AFAIK. It'd be useful to have a solution to that issue
> before proceeding with it as an approach.
> 
>> Understood. On the high level it seems to me a nonce/cookie exchanged
>> over one reqular TCP connection (w/ 3WHS) upfront will always be required
>> but should be sufficient to cover later T/TCP sessions and address the security
>> concern? (Oh perhaps the cookie can be passed around by attackers to mount
>> a DDOS attack?)

Yeah - that's the problem. See http://www.mid-way.org/doc/ttcp-sec.txt

Nonces are addressed in Sec 5, and there doesn't appear to be a solution.

Joe
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