Cisco 877 IPv6 issue

Discussion in 'Cisco' started by Mike Zanker, Oct 17, 2009.

  1. Mike Zanker

    Mike Zanker Guest

    I've set up my Cisco 877 to route IPv6 to/from my LAN to my ISP. Routing
    works fine - I can access IPv6 addresses on the Internet without any
    problems. However, I can't talk to the router's global IPv6 address on
    the ethernet interface (Vlan1) and this seems to be because the Cisco is
    ignoring neighbour solicitation messages from other IPv6 hosts on the
    LAN. Doing a packet trace I see lots of, e.g.

    2001:8b0:f:1:217:f2ff:fe0c:2e20 -> ff02::1:ff00:1 ICMPv6 Neighbor
    solicitation

    but no neighbour advertisement back from the Cisco. Pinging the Cisco's
    link local address works fine (hence being able to route through to the
    Internet - it's just the global address that doesn't respond.

    Is this a bug in Cisco's IPv6 implementation? I'm running 12.4(24)T1.

    Thanks,

    Mike
     
    Mike Zanker, Oct 17, 2009
    #1
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  2. Mike Zanker <> writes:
    >I've set up my Cisco 877 to route IPv6 to/from my LAN to my ISP. Routing
    >works fine - I can access IPv6 addresses on the Internet without any
    >problems. However, I can't talk to the router's global IPv6 address on
    >the ethernet interface (Vlan1) and this seems to be because the Cisco is
    >ignoring neighbour solicitation messages from other IPv6 hosts on the
    >LAN. Doing a packet trace I see lots of, e.g.


    >2001:8b0:f:1:217:f2ff:fe0c:2e20 -> ff02::1:ff00:1 ICMPv6 Neighbor
    >solicitation


    >but no neighbour advertisement back from the Cisco. Pinging the Cisco's
    >link local address works fine (hence being able to route through to the
    >Internet - it's just the global address that doesn't respond.


    >Is this a bug in Cisco's IPv6 implementation? I'm running 12.4(24)T1.


    I've got exactly the same problem my Cisco 877W. It works fine with
    12.4(24)T but not with 12.4(24)T1 or 12.4(24)T2. Unfortunately the
    later is required to fix security problems. :-(

    Kind regards
     
    Matthias Scheler, Oct 25, 2009
    #2
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  3. Mike Zanker

    waydot Guest

    On Oct 25, 4:47 am, Matthias Scheler <> wrote:
    > I've got exactly the same problem my Cisco 877W. It works fine with
    > 12.4(24)T but not with 12.4(24)T1 or 12.4(24)T2. Unfortunately the
    > later is required to fix security problems. :-(


    I can confirm this same issue on 12.4(24)T1 and also on 12.4(15)T10.

    This worked on 12.4(6)T, but alas that version has other problems, and
    I cannot use it.
     
    waydot, Oct 30, 2009
    #3
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