not removed dns entry on a system exit from network

Mohammad Ebrahim Abravi lamp.mia at
Tue Nov 1 12:52:59 MDT 2011

using samba 4.0.17 and bind 9.8.0 and dhcp server

if user login from a machine in my network, automatically add ip and
machine name to zone file. if machine ip changed zone automatically update
but if machine is down or exit from network, name and ip stay in zone file
and if use 'host .... ' cammed show ip. if ip assign to another  machine,
machine not add to dns zone.

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