On Tue, 2006-04-04 at 17:40 -0600, Mark Butler wrote:
> Rick Jones wrote:
> 
> > Again from RFC 791:
> >
> >> <snip>
> >>     Every internet destination must be able to receive a datagram of 576
> >>     octets either in one piece or in fragments to be reassembled.
> >
> >
> > Hence the minimum IPv4 MTU of 68 bytes.
> >
> >
> Makes sense to me. Does a similar argument apply the IPv6 "minimum" MTU?

IPv6 minimum mtu is mandated to be 1280 bytes.  Routers attempting to
reduce mtu below that number will cause the sending host to continue
fragmenting to 1280.  The only difference is that, even if the IP packet
generated at the host is smaller then 1280, a fragment header is still
inserted.

-vlad
> 
> - Mark B.
> 
> >
> >
> 

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