Dynamic vs static IP allocation w/r known MAC with 2 servers

Niall O'Reilly Niall.oReilly at ucd.ie
Thu Apr 26 10:23:40 UTC 2007

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On 26 Apr 2007, at 10:26, Emmanuel Halbwachs wrote:

>   Is it possible that two DHCP servers (ISC) live together in the same
>   VLAN, where the first always offer an IP address and the second no,
>   but is prioritary when it answers?

	No.  The priority you suggest is a kind of state, which the two
	servers have no way of sharing.

> Goal:
>   Enter in the modern world of DHCP ;-) by allocating:
> 	- fixed address for known MAC addresses
> 	- dynamic IP in another subnet for unknown MAC addresses
> 	  (guest/visitor)

	You can do this with one DHCP server (or a failover pair, I guess).
	I'll retrieve the relevant fragments of how we do it, but I'm busy
	until Monday lunchtime.  Please nag off-list if you don't have
	something from me by Tuesday morning.

	Hint: "deny known" ...

	Best regards,

	Niall O'Reilly
	University College Dublin IT Services

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