IPv6 over gif(4) broken in 6.2-RELEASE?

Bruce A. Mah bmah at freebsd.org
Tue Jan 23 16:48:09 UTC 2007

If memory serves me right, Dimitry Andric wrote:
> Bruce A. Mah wrote:
>>> and later I found out it was caused by commit
>>> http://lists.freebsd.org/pipermail/freebsd-stable/2006-December/031853.html
>> This isn't consistent with what I'm finding.  For one thing, rev.
>> of nd6.c isn't in 6.2-RELEASE but I saw the problem there
>> anyways.  Also, that's not the change I made to my local sources to get
>> my gif(4) tunnel working.  Are you sure about this?  :-)
> I'm following -STABLE, and is in there.  Since it was
> committed on 29 Nov, I suspected it would end up in -RELEASE, but
> apparently not. :)
> I explicitly tried reverting just this one commit, and for me it solved
> the problem (i.e. the automagical addition of needed routing entries).

I tried this too and it didn't help.  :-(

Just to confirm, you're dealing with a gif(4) interface with an
explicitly-configured destination address and a 128-bit prefixlen, yes?

> So for you, reverting the combination of and .15 works?

Yep.  BTW these two changes really go together, so it doesn't really
make sense to revert just one of them (the commit logs implied that this
 would be fairly broken in other ways).

> Maybe
> there is something else involved too, for example the route command
> itself?

Not sure what you mean by this exactly...???...

Here's what I've tested so far...in the table below, "work" means that
the host route to the destination got installed correctly and "no work"
means that it didn't.

Base		Local Patch			Result
----		-----------			------
6.2-RELEASE	Unmodified			No work
6.2-RELEASE	Revert nd6.c 1.48.2.{14,15}	Work
6.2-STABLE	Unmodified			No work
6.2-STABLE	Revert nd6.c 1.48.2.{14,15}	Work
6.2-STABLE	Revert nd6.c		No work

I'm going to write up an entry for the 6.2-RELEASE errata notes
documenting the existence of a problem and a workaround.  We still need
to figure out exactly what the right fix is.  Testing results from other
users (both 6.2-RELEASE and 6.2-STABLE) would be most welcome.


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