if_bridge and IPv6?

From: Bruce A. Mah (bmah_at_freebsd.org)
Date: 08/29/05

  • Next message: Andrew Thompson: "Re: if_bridge and IPv6?" 
    To: freebsd-net@freebsd.org
Date: Mon, 29 Aug 2005 13:17:23 -0700

    Hi folks--

    Can anyone tell me if I should be able to run IPv6 over an if_bridge
    interface?

    I'm running RELENG_6 from a few days ago on a Soekris net4801 and have
    created a bridge0 interface with two of the physical network interfaces
    (sis0 and sis1) as members.

    IPv4 seems to work fine over this; I can assign an IPv4 address to
    bridge0 and everything seems normal. If I assign an IPv6 address to the
    interface, no IPv6 packets seem to go in or out, and ping6-ing a machine
    on the same subnet yields:

    hornet# ping6 other_address
    PING6(56=40+8+8 nbytes) (net4801_address) --> (other_address)
    _storelladdr: something odd happens
    ping6: sendmsg: Invalid argument
    ping6: wrote tomcat.kitchenlab.org 16 chars, ret=-1
    nd6_storelladdr: something odd happens

    Note that the output above is slightly mangled; I wonder if this has to
    do with some buffer related to the net4801's serial console being
    overrun. Anyways.

    tcpdump-ing in various places shows that ICMPv6 neighbor solicitation
    packets aren't leaving the net4801. If I try to ping the net4801 from
    other machines on the subnet, I can see *their* neighbor solicitation
    packets arrive at the net4801 with tcpdump, but it never (as far as I
    can tell) sends a response.

    I wonder if this has to do with IPv6 ND packets being sent as multicast,
    but that's just a guess. Googling showed that at least on NetBSD 1.6,
    this didn't work, but I wasn't able to find anything immediately
    applicable to FreeBSD 6.0-BETA3. :-)

    Any ideas?

    Thanks!

    Bruce.

  • Next message: Andrew Thompson: "Re: if_bridge and IPv6?"

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