576 is the mimimum reassembly buffer size to be supported
by all IPv4 hosts. It is *not* the minimum path MTU size.
The miminum link MTU is 68 bytes. RFC 791.
Mark
In message <[email protected]>, Brian E Carpenter writes:
> On 20/08/2014 11:24, Fernando Gont wrote:
> > Hi, Brian,
> >
> > On 08/19/2014 07:58 PM, Brian E Carpenter wrote:
> >>> It does seem kind of silly that we say "you must support MTU >= 1280 to r
> un
> >>> IPv6" and then allow PTB packets with an MTU < 1280. Any reason we can't
> >>> simply say that PTB packets < 1280 are invalid?
> >> Because of SIIT, that is equivalent to saying that the minimum IPv4
> >> MTU is now 1260. That might be a discussion worth having, but 576 has
> >> been around for a long time.
> >
> > Not sure what you meant about 576... that we can assume that to be a
> > minmum MTU,
>
> Yes, that hasn't changed since RFC 791 (although the way fragmentation
> is defined for IPv4 is rather different from IPv6, of course).
>
> Maybe we consider it acceptable that SIIT will break on paths that
> include a shorter-than-Ethernet link MTU. But we need to make that
> statement explicit.
>
> Brian
>
> or something else?
> >
> > Thanks!
> >
> > Cheers,
>
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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: [email protected]
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