kern/115413: [ipv6] ipv6 pmtu not working

[Jacek Zapala]

On Tue, 2007-08-21 at 15:50 +0200, Daniel Hartmeier wrote:
> Since you're using TCP window scaling, could you try disabling that
> (sysctl net.inet.tcp.rfc1323=0 on either peer), and see if it affects
> things? Just to make sure that's not a part of the problem. 

Good guess!
I have disabled this on sending side (FreeBSD) and it started to work!

Btw, how can I examine the route mtu cache? In older FreeBSD 
netstat -ranW showed cloned routes and their mtus, but this is no longer
the case with FreeBSD 6.2.

	Jacek