HP-UX TCP/IP Performance White Paper, March 2008

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to set the random timer interval for flushing neighbor cache entries.
The Reachable Time is the time a neighbor is considered reachable
after receiving a reachability confirmation. The Reachable time value
is a uniformly-distributed random value between "ip6_min_random_factor"
and "ip6_max_random_factor" times "ip6_ire_reachable_interval"
milliseconds. [5000, -] Default: 30000 (30 sec)
It is rare that the following IPv6 values should need to be changed. They are related to IPv6 auto-
configuration and the default values are set based on the standard.
ip6_max_random_factor:
The Neighbor Discovery constant MAX_RANDOM_FACTOR, Section 10 of
RFC 2461. For more on this tunable, refer to the discussion of
"ip6_ire_reachable_interval". [100, 200] Default: 150
ip6_min_random_factor:
The Neighbor Discovery constant MIN_RANDOM_FACTOR, Section 10 of
RFC 2461. For more on this tunable, refer to the discussion of
"ip6_ire_reachable_interval" [0, 100] Default: 50
ip6_nd_advertise_count:
The Neighbor Discovery constant MAX_NEIGHBOR_ADVERTISEMENT, Section 10 of
RFC 2461. This tunable specifies how many neighbor advertisements can
be sent. For example, when a node determines that its link-layer
address has changed and it may wish to inform its neighbors of the
new link-layer address quickly. In such case a node may send up
to "ip6_nd_advertise_count" unsolicited Neighbor Advertisement
messages to the all-nodes multicast address. These advertisements
are separated by at least "ip6_nd_transmit_interval" seconds.
[1, 10] Default : 3 transmissions
ip6_nd_dad_solicit_count:
The number of duplicate address detection solicitations that are sent.
[0, 10] Default: 1 transmission
ip6_nd_multicast_solicit_count:
The Neighbor Discovery constant MAX_MULTICAST_SOLICIT, Section 10 of
RFC 2461. If no Neighbor Advertisement is received after
"ip6_nd_multicast_solicit_count" solicitations, address resolution
has failed. The host will return ICMP destination unreachable indications
with code 3 (Address Unreachable) for each packet queued awaiting address
resolution. [1, 10] Default: 3 transmissions
ip6_nd_probe_delay:
The Neighbor Discovery constant DELAY_FIRST_PROBE_TIME, Section 10 of
RFC 2461. The first time a node sends a packet to a neighbor whose entry
is STALE, the sender changes the state to DELAY and sets a timer to