Re: IPv6 day and tunnels

[bmanning () vacation karoshi com]

On Sun, Jun 03, 2012 at 10:05:40PM -0400, Joe Maimon wrote:
> Joe Maimon wrote:
>
> > Looks like a tunnel mtu issue. I have not as of yet traced the
> > definitive culprit, who is (not) sending ICMP too big, who is (not)
> > receiving them, etc.
>
> The culprit is the v6 tunnel, which wanders into v4 ipsec/gre tunnels, 
> which means the best fix is ipv6 mtu 1280 on the tunnels, and possibly 
> on the hosts. PMTUD works fine, just comes up with the wrong answer.
>
> 1280, the new 1500.
>
>
> > Joe


        actually, to be safe,   1220.


/bill