IPv6 MTUs smaller than 1280 bytes?

[bmanning at vacation.karoshi.com]

	i will admit to truting what my tools tell me, and 
	they report an MTU of 1220.  It appears to be from a
	single vendors kit.

--bill


On Fri, Sep 10, 2010 at 06:40:19PM -0300, Fernando Gont wrote:
> Hi, Bill,
> 
> Thanks so much for your response. Just to double-check: is this the
> actual MTU, or do you infer such MTU as a result of he advertised TCP
> MSS option?
> 
> Thanks!
> 
> Fernando
> 
> 
> 
> 
> bmanning at vacation.karoshi.com wrote:
> > yes - we see MTUs of 1220 with some regularity.
> > 
> > --bill
> > 
> > 
> > On Fri, Sep 10, 2010 at 05:36:52PM -0300, Fernando Gont wrote:
> >> Hi,
> >>
> >> I'm told that in some scenarios, IPv6 operates over link-layers that do
> >> not provide an MTU gretear than or equal to 1280 bytes (the IPv6
> >> required minimum MTU).
> >>
> >> Has anybody seen such a thing?
> >>
> >> P.S.: Yes, I'm aware of what RFC 2460 requires.
> >>
> >> Thanks,
> >> -- 
> >> Fernando Gont
> >> e-mail: fernando at gont.com.ar || fgont at acm.org
> >> PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1
> >>
> >>
> >>
> >>
> > 
> 
> -- 
> Fernando Gont
> e-mail: fernando at gont.com.ar || fgont at acm.org
> PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1
> 
> 
>