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[tcpm] timestamp options (was Re: New Version Notification for draft-touch-tcpm-tcp-edo-01.txt)

"Eggert, Lars" <lars@netapp.com> Mon, 26 May 2014 09:38 UTC

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From: "Eggert, Lars" <lars@netapp.com>
To: Joe Touch <touch@isi.edu>
Thread-Topic: timestamp options (was Re: [tcpm] New Version Notification for draft-touch-tcpm-tcp-edo-01.txt)
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Date: Mon, 26 May 2014 09:37:43 +0000
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Subject: [tcpm] timestamp options (was Re: New Version Notification for draft-touch-tcpm-tcp-edo-01.txt)
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Hi,

On 2014-5-23, at 18:55, Joe Touch <touch@isi.edu> wrote:
> Current total for SYN options in widespread concurrent use (as already described in sec 6.4):
> 
> 	2	SACK permitted
> 	10	timestamp
> 	3	window scale
> 	4	MSS
> 	------------------
> 	11 bytes

I think it was Mark Allman who questioned a while ago whether the benefits of the timestamp option are worth spending 10 bytes in every packet. (But I can't find the email now.)

> 	11	widespread basic options
> 	16	TCP-AO
> 	20	MPTCP
> 	--------------------
> 	47

If we could shave those off, we'd be at 37 even with AO. It wouldn't make the option space any bigger for the future, but it would get us out of the current situation, and would make a combination of some crypto and MPTCP be deployable.

Lars

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