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Well, I've probably taken the wrong way to debug but:

>ping6 -s 1300 my-ipv6-address

gives me icmp packets fragmented to payload 1232 and additional =
fragments
of 76 bytes...

I've tried this with a crossed Ethernet cable to avoid any interaction
with other equipments and the result is still the same...

I can observe this behavior on machines running netbsd from 1.6.1_STABLE
to 2.99.10 ...

Any hints?

Konstantin

>-----Original Message-----
>From: der Mouse [mailto:mouse@Rodents.Montreal.QC.CA]
>Sent: jeudi 2 d=E9cembre 2004 17:15
>To: Konstantin KABASSANOV; tech-net@NetBSD.org
>Subject: Re: ipv6 mtu
>
>> I mentioned that ipv6 packets over Ethernet interfaces are
>> systematically limited to 1280 bytes even if the interface MTU is
>> configured at 1500 (in IPv4 everything is ok).  Is it normal?
>
>No.  I don't even see it; when tcpdumping a v6 connection (over
>Ethernet) I see packets with over 1280 bytes of payload alone (1428, to
>be specific).
>
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