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From: Sean McNeil <sean@mcneil.com>
To: SUZUKI Shinsuke <suz@freebsd.org>
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Organization: Sean McNeil Consulting, Inc
Date: Mon, 07 Nov 2005 02:53:33 -0800
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Cc: ume@freebsd.org, current@freebsd.org
Subject: Re: recent MFC code to 6-STABLE kills ipv6
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On Sun, 2005-11-06 at 18:06 +0900, SUZUKI Shinsuke wrote:
> Hello Sean,
> 
> >>>>> On Sat, 5 Nov 2005 14:39:13 -0800
> >>>>> sean@mcneil.com(Sean McNeil)  said:
> 
> > > sean> ping6 does NOT work for
> > > sean> fe80::203:6dff:fe1a:b19b%dc0
> > > sean> 2002:18c7:2d36:0:203:6dff:fe1a:b19b
> > > sean> 2002:18c7:2d36::
> > >
> > > It seems an IPv6 operation for dc0 is disabled entirely.  Don't you
> > > see an error message from your kernel like following?
> > > 	dc0: possible hardware address duplication detected, disable IPv6
> > No, nothing like that in any logs.  I can't see how there could  
> > suddenly be a duplication of hardware addresses.  I agree, though,  
> > that IPv6 is disabled for dc0.  Some change in the kernel has caused  
> > this.
> 
> I tried the same configuration (with the different interface card)
> using the latest RELENG-6 in my environment, but I couldn't reproduce
> your problem.

With a kernel built just moments ago, I still have the same issue.  I
have an older kernel, however, that works perfectly fine:

FreeBSD server.mcneil.com 6.0-STABLE FreeBSD 6.0-STABLE #78: Tue Nov  1 23:07:02 PST 2005     root@server.mcneil.com:/usr/obj/usr/src/sys/AMD64  amd64

With this kernel I can ping6 my dc0 interface just fine.  That should
help narrow things down a bit.

Cheers,
Sean