On 8/29/2018 7:58 PM, Joe Touch wrote: > > > On 2018-08-29 18:34, Tom Herbert wrote: > >> >> Joe, >> >> End hosts are already quite capable of dealing with reassembly, > > Regardless, middleboxes shouldn't be avoiding their own effort by > creating work for others. A corollary to the Postal Principle should > be "you make the mess, you clean it up".
Joe's stubborn adherence to the letter of the RFC would be very nice if the protocol police could somehow punish the merchants of NATs... The whole discussion reminds me of Martin Thomson's draft, "use it or lose it" (draft-thomson-use-it-or-lose-it-02). Martin is describing how extension mechanisms that are not actually used get ossified away by the deployment of middle-boxes. The same happened long ago with IP segmentation. With NATs, applications cannot assume that reassembly will work. With Firewalls, transports cannot assume that ICMP will work. -- Christian Huitema
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