On Wed, Jul 25, 2018 at 7:14 PM, Joe Touch <[email protected]> wrote: > Hi, all, > > I still think it would be useful for this doc to describe how tunnels > interact with fragmentation (per draft-ietf-intarea-tunnels), which seems to > be something I’ve noted several times before. > > I’m also still not thrilled with the title I’d be happier with “IP > fragmentation still not supported per requirements”, and I’d have to see > where this goes with final recommendations. > > But I agree *some* statement is worthwhile here. My primary concern is that > if we’re not careful, endorsing the status quo will only ensure nothing > changes. > > So I sincerely hope that some of the strongest recommendations here are that > both direct IP devices and tunnel ingress/egress devices need to do a better > job of supporting fragmentation, and that protocol/device designers SHOULD > avoid mechanisms that are not compatible with fragmentation (e.g., NAT or DPI > without doing reassembly first). > I agree.
Specifically, I think there should be a requrement that intermediate devices don't rely on doing DPI into transport layer, or if they need it then they should do some sort of pseudo reassmbly as Joe alludes to. Note that section 4.4 describes the problem of of fragmentation going through a load balancing (e.g. ECMP) where transport ports are used in the algorithm. This is solved in IPv6 by using flow label in the hash instead of transport layer ports, so I think that use of flow label for this purpose should be recommended somewhere in section 7. Tom > Joe > >> On Jul 24, 2018, at 12:42 PM, Wassim Haddad <[email protected]> >> wrote: >> >> Dear all, >> >> We would like to start a WG adoption call for >> draft-bonica-intarea-frag-fragile (“IP Fragmentation Considered Fragile”). >> >> https://www.ietf.org/id/draft-bonica-intarea-frag-fragile-03.txt >> >> >> Please indicate your preferences on the mailling list. The deadline is >> August 10th. >> >> >> Thanks, >> >> Juan & Wassim >> _______________________________________________ >> Int-area mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/int-area > > _______________________________________________ > Int-area mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/int-area _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
