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

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expire in "ip6_nd_probe_delay" seconds. If the entry is still in
the DELAY state when the timer expires, the entry's state changes to
PROBE. If reachability confirmation is received, the entry's state
changes to REACHABLE. [5000, -] Default: 5000 (5 sec)
ip6_nd_transmit_interval:
The Neighbor Discovery constant RETRANS_TIMER, Section 10 of
RFC 2461. This tunable specifies the time between retransmissions
of Neighbor Solicitation messages to a neighbor when resolving the
address or when probing the reachability of a neighbor.
[1000, -] Default: 1000 (1 sec)
ip6_nd_unicast_solicit_count:
The Neighbor Discovery constant MAX_UNICAST_SOLICIT, Section 10 of
RFC 2461. A node sends a unicast Neighbor Solicitation message to
the neighbor using the cached link-layer address. While in the PROBE
state, a node retransmits Neighbor Solicitation messages every
"ip6_nd_transmit_interval" milliseconds until reachability
confirmation is obtained. Probes are retransmitted even if no
additional packets are sent to the neighbor. If no response is
received after waiting "ip6_nd_transmit_interval" milliseconds after
sending the "ip6_nd_unicast_solicit_count" solicitations, retransmissions
cease and the entry will be deleted. Subsequent traffic to that
neighbor will recreate the entry and performs address resolution
again. [1, 10] Default: 3 transmissions
ip6_rd_solicit_count:
The Neighbor Discovery constant MAX_RTR_SOLICITATIONS, Section 10 of
RFC 2461. When an interface becomes enabled, it may not be desirable
to just wait for the next unsolicited Router Advertisement to locate
default routers or learn prefixes. In order to obtain Router
Advertisements quickly, a host can transmit up to "ip6_rd_solicit_count"
Router Solicitation messages each separated by at least
"ip6_rd_transmit_interval" seconds. [1, 10] Default: 3 transmissions
ip6_rd_solicit_delay:
The Neighbor Discovery constant MAX_RTR_SOLICITATION_DELAY, Section 10 of
RFC 2461. Before a host sends an initial solicitation, it delays the
transmission for a random amount of time between 0 and
"ip6_rd_solicit_delay". This serves to alleviate congestion when
many hosts start up on a link at the same time, such as might happen
after recovery from a power failure. [1000, -]
Default: 1000 (1 sec)
ip6_rd_transmit_interval:
The Neighbor Discovery constant RTR_SOLICITATION_INTERVAL, Section 10 of
RFC 2461. This tunable specifies the interval of sending Router
Solicitation messages. See a related tunable "ip6_rd_solicit_count"
for more detail discussion. [1000, -] Default: 4000 (4 sec)