On Tue, Sep 3, 2019, 8:58 AM Fernando Gont <[email protected]> wrote:
> On 3/9/19 18:41, Templin (US), Fred L wrote: > > > > > >> -----Original Message----- > >> From: Fernando Gont [mailto:[email protected]] > >> Sent: Tuesday, September 03, 2019 7:50 AM > >> To: Templin (US), Fred L <[email protected]>; Joe Touch < > [email protected]>; Alissa Cooper <[email protected]> > >> Cc: Joel Halpern <[email protected]>; > [email protected]; [email protected]; The IESG < > [email protected]>; > >> [email protected] > >> Subject: Re: [Int-area] Alissa Cooper's No Objection on > draft-ietf-intarea-frag-fragile-16: (with COMMENT) > >> > >> On 3/9/19 17:33, Templin (US), Fred L wrote: > >>> Why was this section taken out: > >>> > >>>> 1.1. IP-in-IP Tunnels > >>>> > >>>> This document acknowledges that in some cases, packets must be > >>>> fragmented within IP-in-IP tunnels [I-D.ietf-intarea-tunnels]. > >>>> Therefore, this document makes no additional recommendations > >>>> regarding IP-in-IP tunnels. > >>> > >>> Tunnels always inflate the size of packets to the point that they may > exceed > >>> the path MTU even if the original packet is no larger than the path > MTU. And, > >>> for IPv6 the only guarantee is 1280. Therefore, in order to robustly > support > >>> the minimum IPv6 MTU tunnels MUST employ fragmentation. > >> > >> Isn't that an oxymoron? If fragmentation is fragile, if you need > >> something robust, you need to rely on something else.... > > > > IPv6 fragmentation is not fragile - only IPv4 fragmentation is fragile. > > * RFC7872. > * https://blog.apnic.net/2017/08/22/dealing-ipv6-fragmentation-dns/ > > These seems pretty fragile to me. YMMV, though. > Fernando, That's fragmentation in DNS, not tunneling which is what Fred's question is about. Besides that, Fred's point is still correct-- fragmentation is not fragile for IPv6, it's broken, non-conformant implementations that are fragile. Tom > Thanks, > -- > 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 >
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