Date: Fri, 08 Jun 2012 06:59:22 +0100
From: Matthew Seaman <m.seaman@infracaninophile.co.uk>
To: freebsd-questions@freebsd.org
Subject: Re: Configuration problem with IPv6 router ("cannot forward src")
Message-ID: <4FD194BA.3060208@infracaninophile.co.uk>
In-Reply-To: <4FD12CFF.6020205@cran.org.uk>
References: <4FD12CFF.6020205@cran.org.uk>
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On 07/06/2012 23:36, Bruce Cran wrote:
> I'm trying to set up a IPv6 router (running -current) on my home
> network. My ISP gives me a /128 via PPP and I have a /48 allocation,
> which I use to give em0 and tun0 public addresses in different subnets
> (tun0 is assigned the address via ppp.linkup).
> I've added all the IPv6 settings to rc.conf (ipv6_gateway_enable,
> ipv6_network_interfaces, rtadvd_enable etc.) and I can ping IPv6 sites
> from the router.
rtadvd can be limited to operate on a specific interface. Try setting
rtadvd_interfaces="em0"
in /etc/rc.conf
> The problem is that rtadvd continues advertising the default gateway as
> tun0's link-local address - and pinging from a machine on the network
> results in "cannot forward src" messages on the router (strangely,
> despite hisaddr being fe80::205:... in ppp.log, the kernel logs the
> address as fe80:f::205:...).
Try setting:
ipv6_default_interface="tun0"
and possibly also
ipv6_defaultrouter="-interface tun0"
I use a gif tunnel (IPv6 over IPv4) for my IPv6 connectivity -- no
native support for IPv6 in my ADSL router -- so not exactly equivalent
but pretty similar in many ways.
> Is there some extra configuration I've likely missed that's needed when
> using IPv6 via PPP?
Probably. The good news is that once you've got it running the IPv6
support in FreeBSD is rock solid and works like a charm.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
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