Option 82 and dhcpd. "No free leases" for second computer

Posted by SaveTheRbtz on Server Fault See other posts from Server Fault or by SaveTheRbtz
Published on 2009-06-19T00:24:33Z Indexed on 2010/04/06 9:23 UTC
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Filed under:

freebsd

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dhcp

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isc-dhcpd

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option82

There is DHCP server in network (isc-dhcpd-server-3.0 on FreeBSD 7.2) than gives one IP per switch port to every user via Option 82

The problem appears when user disconnects one of his computers and connects another(i.e notebook with different MAC address) then DHCPD puts to log "...network net1: no free leases", because there is record in leases file that this IP is already owned by another MAC. That second computer will have his IP only after default-lease-time (that is IIRC minimum 10min, and after 3min he usually calling support) or after deletion of dhcpd.leases file and restart of dhcpd.

Is there a way to turn leases off at all, because we have strict binding between switch-port-ip?

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