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Neighbour table overflow error related to ipv6 tunnel maybe?

Discussion in 'Tomato Firmware' started by LanceMoreland, May 21, 2012.

  1. LanceMoreland

    LanceMoreland Network Guru Member

    All of a sudden I am getting a lot of "Neighbour table overflow" enteries in my logs" Anyone know what this means. I've never seen this before and it just started. I noticed it after I deleted my HE ipv6 tunnel and created one that used a server closer to me. Related maybe? I am running Toastman's latest on an E4200 v1.

    Edit: Before the "Neighbor table overflow" errors there is always "printk: 107 messages suppressed"

    Example:
    May 20 13:00:01 Tomato-1 syslog.info root: -- MARK --
    May 20 14:00:01 Tomato-1 syslog.info root: -- MARK --
    May 20 15:00:01 Tomato-1 syslog.info root: -- MARK --
    May 20 15:14:17 Tomato-1 user.warn kernel: printk: 107 messages suppressed.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 15:14:17 Tomato-1 user.warn kernel: Neighbour table overflow.
    May 20 16:00:01 Tomato-1 syslog.info root: -- MARK --
    May 20 17:00:01 Tomato-1 syslog.info root: -- MARK --
     
  2. LanceMoreland

    LanceMoreland Network Guru Member

    No ideas on what might be causing these warnings?
     
  3. mstombs

    mstombs Network Guru Member

    This used to be a problem with Linux based routers and IPV4 a long time ago - for example when my local cable modem company used wide netmasks making every local user in the same local network which could fill the 'arp table', was fixed by a CISCO system upgrade. Could also happen with certain types of half-bridge modem where the modem pretended to be the owner of every MAC address! Don't know about IPV6 but the equivalent of the arp table is going to be bigger simply because each IP address can be twice as long.
     

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