Option 82 fast change

[Niall O'Reilly]

On Thu, 11 Sep 2008 15:41:04 +0100, Anders Rosendal <anders at rosendal.nu>  
wrote:

> Then we are at least three.
> Have a public network where customers are assigned one "static ip"  
> through dhcp, and when they change equipment on there ports they don't  
> get the IP for the "new" equipment.
> Would like to see some kind of leasetime-override.

	Be careful what you wish for.
	Over-riding leases is likely to be a source of problems.

	Can you depend on the customer to set the Client ID of the
	equipment to a site-specific string chosen by you?  This may
	be an immediate work-around, as the ISC DHCP server (IIUC)
	heeds a Client-ID string in preference to a MAC Address.

	IIRC, there has been some discussion on this list about the
	desirability of a configuration option to force the MAC address
	(rather than the Client ID string) to be the key for the lease.
	If this idea reaches the top of the work-list, it might be
	useful to consider providing an additional flavour of this
	option which would allow the lease key to be derived from
	Option-82 data.

	Best regards,

	Niall O'Reilly
	University College Dublin IT Services