environments where DHCP servers can be reasonably guaranteed to be
"down" when the failover TCP socket is severed, "auto-partner-down".
This parameter is not generally safe, and by default is disabled, so
please carefully review the documentation of this parameter in the
dhcpd.conf(5) manpage before determining to use it yourself.
[ISC-Bugs #19600]
active to free states. Leases that belonged to the failover secondary
are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
If lease rebalancing must move leases, it tries first to move leases
that belong to the peer in need.
- The server no longer sends POOLREQ messages unless the pool is severely
misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
- Pool rebalance events no longer happen upon successfully allocating a
lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
min-balance and max-balance statements for more information.
[ISC-Bugs #13308]
immediately responded to, but are placed on a queue (attached to
the dhcp_failover_state_t structure). Updated leases are committed
only when the queue is drained, giving a significant performance
increase.
The toack queue is drained:
a) when the queue size exceeds half the partner's max-unacked-updates
setting, or
b) two seconds after the last update message is received.
Added 'refcnt' and 'next' fields to the failover_message_t structure,
to allow messages to be placed on the toack queue.
On the sending side, leases are no longer committed immediately after
being acked. Rather, the commit is deferred until no further acks are
pending. This also gives a major gain in performance.
being correctly reference-counted.
- Make and use object-specific allocators.
- Add reference/dereference support to hash functions and to timeout
functions.
