User manual
Chapter 4 - Layer 3 Command Set - IP Networking DHCP Server
Alvarion BreezeNET B130/B300 GigE 224 Operational User Manual
[eth0]
>BOUND_HISTORY 1
(MSOFT) ID:01:00:0F:EA:05:29:C6 BOUND=192.168.177.21
until 02/01/2003 13:25:37
OK
The information about expired leases is saved in the database during 24 hours.
After 24 hours the record is automatically deleted from the database, and the
IP-address becomes a free address (after being <OBIND>).
The server will use <OBIND> addresses for other clients if all the scopes (which
suit new clients) ran out of free addresses. The server will use the oldest records
in "boundhistory" in the first turn.
The server will also cancel an address lease after a client's corresponding request.
4.16.1.8 Admissibility check for IP-addresses lease
The check is made in order to avoid IP-addresses conflicts. After the server
detected the IP-address as being free, it will perform an admissibility check prior
to IP-address lease to the client. In other words, the server makes sure that this
IP-address is not occupied by any host (except, may be, for the target client itself)
on the client's interface. The server makes ARP-requests on the client's interface.
If no one answered the request (may be except for the target client), the IP-address
will be given for a lease.
This check is performed in any case except for case of virtual interfaces when the
check is a client's responsibility.
If IP-addresses conflict is detected, this IP-address will not be given for a lease.
The server will attempt to give a next free IP-address. If, eventually, there is no
free IP-address left, the server looks into boundhistory for the client's interface. If
this step failed, the server puts this client into a database of unleases.
4.16.1.9 Unleases
Clients to which DHCP server failed to give an IP-address for a lease are put to a
special list - unleases. The records in this list are saved for 15 minutes if a client
does not repeat an attempt to get a lease. Each record in the list consists of the
following fields:
1 Name of a network interface from which a client's request for a lease was
received (client's interface).
2 Client's identifier