Re: [tcpm] New Version Notification for draft-touch-tcpm-tcp-edo-01.txt

[Joe Touch <[e-mail]>]

On 5/22/2014 11:58 AM, Wesley Eddy wrote:
> On 5/22/2014 1:58 PM, Joe Touch wrote:
>>> 2) However, I think the main problem is that many important cases will
>>> need as large or larger TCP option space on the SYN as on non-SYNs.
>>
>> Oh, I certainly agree with this. The point of this proposal is twofold:
>>
>>      a) (primary) to put to bed the notion that 'there is a way'
>>      to extend SYN option space without contaminating connections to
>>      legacy hosts
>>
>>      b) (secondary) to do the only extension possible - post-SYN.
>
>
> I agree with this.  In my view, we actually have had consensus
> for a long time that extending the SYN is "really hard" (requiring
> some creativity),

Well, AFAICT we've also known for a long time that it's basically 
impossible when needed - i.e., to new endpoints, without impacting 
legacy endpoints (i.e., making their connections to new systems slow or 
misinterpreting option info as user data).

Yes, there are a few other potential solutions that need to be discussed 
as non-viable, but IMO that's an important part of this doc.

At the very least, even if it's not provably impossible, the obvious 
solutions don't work and it's harder than it looks.

Joe