On 7/18/2017 4:05 PM, Olivier Bonaventure wrote: >> Although I'm not averse to middleboxes as optional optimizations, I find >> the proposed mechanisms aren't quite optional -- they inject option >> information into the SYN data. That information would poison a >> connection to a legacy receiver if (more to the point, when) that info >> isn't removed by a proxy upstream of the receiver. > > This paragraph refers to earlier documents discussed in the MPTCP > working group. The new design does not inject option information into > the SYN data. It works like an application layer protocol that sends > messages > in the SYN by using the TFO option. There is no risk of poisoning.
OK, in that case: - I'm still not averse to middleboxes that accelerate or enhance TCP - IMO, TCP always needs to be able to fall back (which should be true now) - but I remain concerned with "injection piggybacking" - even if this is restricted to option space, it increases the risk of damaging an otherwise working connection - it flies in the face of TCP being E2E, and won't work with TCP-AO or IPsec, which IMO means it can't be considered part of "TCP" at all Joe
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