client request preferred IP address

Simon Hobson dhcp1 at
Wed Jul 18 22:38:48 UTC 2007

Jeff Weber wrote:

>I _usually_ have the same IP address assigned by the DHCP server.  Where is
>this "memory" that tries to give me the same IP address?

It depends on the combination of server and client. The RFC says that 
the server should try and give the same address to a client even if 
it's last lease has expired - the ISC server does that while the 
Microsoft one (and the 'basic' ones in consumer grade routers) do 
not. Windows clients on the other hand are very 'sticky' (requesting 
their last address even if the lease has expired) and it can be hard 
to get them to change address - which means that the deficiencies in 
their server are not obvious in a Windoze only environment.

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