how dhcp-server select a ip-address to client?

18905913309 18905913309 at
Mon Mar 5 11:58:52 UTC 2012


i have noticed that the dhcp-clientst's ip address will keep same in most time,even if it released ip-address,then send dhcp-discover in i think if server will watch the dhcpd.leases to find if has a mac-address record in it,then offer the associated ip-address to client. 

but i do observed that client's ip-address changed in some time even if it's dhcp-server's configration remained unchanged and the pools has only been used 60%.

can anybody know in which condition that the dhcp-server will offer a different ip-address to client?


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