On 6/9/19 19:03, Ole Troan wrote: > Joe, > > edited to focus on the two added "recommendation sentences". > >>>>> 1) It introduces something new and undescribed in paragraph 2. >>>>> "unless they also include mechanisms to detect that IP fragmentation >>>>> isn't working >>>>> reliably." >>>>> That seems like hand-waving to me. Suggest deleting. >>>> >>>> Fragmentation success or failure is directly testable. Any feedback >>>> mechanism will work and specific ones are mentioned elsewhere (PLPMTUD). >>>> >>>> This differs from ICMP black-holing in path MTU detection. >>> >>> Can you please point me to where in the PLPMTUD document testing for IP >>> fragmentation is described? >> >> Any feedback mechanism will detect when fragmentation - or anything else - >> prevents delivery. > > Any pointer to such a mechanism in any IETF protocol? > Would be interesting to get transport/application perspective on this. > But unless there is a reference I would claim this is hand-waving.
FWIW, I don't remember seeing anything like this at the network layer. (One might guess that in theory you *could* get feedback from upper layers, but...) This kind of thing is easier at *higher* layers -- such as trying to do the 3WHS with the ECN bits set, and if you don't hear from the other end, try with those bits cleared. But IMO for IP it is easier said than done... -- Fernando Gont SI6 Networks e-mail: [email protected] PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
