Strange IPv6 in FreeBSD 9.1RC1

[Mike Andrews]

On 9/19/2012 9:54 AM, Zach Leslie wrote:
> HI Folks,
>
> I've got two boxes that I recently moved from -stable to 9.1rc1.  I did
> them one at a time, with about a week between the upgrades.  After the
> first upgrade, I noticed something strange with networking but didn't
> really dig into it much.  After the second upgrade immediately experiencing
> the same issues, I figured it seemed to be something related to 9.1rc1.
>
How new is your kernel?  There were some weird IPv6 issues a month or 
two back that have since been fixed.  A kernel from 3 days ago (r240583) 
is working well for me here...  so if you installed from the 9.1-RC1 ISO 
image you might try updating.

The specific issue I had then had to do, I think, with checksums getting 
hosed, which might explain what you're seeing if the destination was 
dropping them as bad...