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Date: Sat, 17 Jan 2009 12:50:50 +0000 (UTC)
From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
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To: Hiroki Sato <hrs@FreeBSD.org>
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Cc: stable@FreeBSD.org
Subject: Re: IPv6 routing on 7.1R
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On Mon, 12 Jan 2009, Hiroki Sato wrote:

Hi,

> I noticed an odd behavior regarding IPv6 after upgrading my 7.0R box
> to 7.1R.  The situation and symptom are the following:
>
> 1. The box has two NICs.  One has an address 2001:0db8:1::1/64 (NIC
>    A), and another has 2001:0db8:2::1/64 (NIC B).  These addresses
>    are assigned manually ($ipv6_ifconfig in rc.conf).
>
> 2. RA is periodically sent to the network 2001:0db8:1::1/64 (NIC A)
>    by a router on the subnet.  The RA includes a source link-layer
>    address option only.
>
> When setting net.inet6.ip6.accept_rtadv=1 in this configuration, I
> expected the box assigns an autoconf IPv6 address (prefix
> 2001:0db8:1::/64 + EUI64) to NIC A and an default route based on
> source link-layer address in the RA packet.  Actually, these two were
> done as expected.  However, after addresses are assigned, routes for
> NIC B disappeared from the routing table.  More specifically, a
> cloning route "2001:0db8:2::1/64 -> link#2" was removed for some
> reason.
>
> Is this an expected behavior?

I don't think so. Can you file a PR and get it assigned to bz@ and
I'll look in two weeks or so once I am fully back.

/bz

-- 
Bjoern A. Zeeb                      The greatest risk is not taking one.