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    SubjectRe: Generic neighbour manipulatoin

    /default/ are default values, which are copied to
    any newly created device. They may be overriden by device
    driver or manually.

    All these variables and neighbour state machine
    are superbly described in IPv6 NDISC RFC
    (f.e. new one appeared last week, I forgot number)

    * mcast_solicit

    Number of broadcast ARPs (or multicast NDISC probes)
    before neighbour is considered unreachable.

    * ucast_solicit

    If address is known, linux periodically probes neighbour
    with unicast ARPs. If ucast_solicit requests are not answered,
    it falls to broadcasting.

    * app_solicit

    If not zero and CONFIG_ARPD is defined, request is sent to user level
    daemon before broadcasting to network.

    * retrans_time

    Interval between probes.

    * unres_qlen

    Maximal number of packets in queue of unresolved packets.

    * gc_stale_time

    Unused entries are removed after this period.

    * base_reachable_time

    reachable_time := random number in the interval

    If for this time no neighbour reachibility confirmations
    (f.e. from TCP) were received, the entry is marked as STALE.

    * delay_first_probe_time

    If entry is STALE, the first attempt to send data
    to the neighbour starts timer delay_first_probe_time.
    If no neighbour reachibility confirmations will arrive
    during this timeout, we will start unicast probes.

    * locktime

    [ ARP/IPv4 specific ] When an entry is modified,
    it is locked for period "locktime", so that attempts
    to change it during this time are ignored.

    * anycast_delay

    [ IPv6 specific ] Maximal delay before answering to request for
    anycast address.

    * proxy_delay

    Maximal delay before sending proxy ARP reply.

    * proxy_qlen

    Maximal number of requests, waiting in proxy arp queue.

    Alexey Kuznetsov

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