DHCP & PXE boot workstations

[Niall O'Reilly]

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On 23 Mar 2007, at 12:44, DOYLE FOSTER wrote:
> SIMON HOBSON wrote:
>> That doesn't sound right, can you post the leases in question ?
> Here is the output from the leases file for this mac address:

	Some parts of what's shown in your selected fragment from the lease  
file are
	unsurprising; others appear really strange. I suspect bizarre client  
behaviour,
	but can't be sure.

	The client presents with 2 "instances": uid respectively present or  
missing.
	Separate treatment of the two is to be expected

	The leases given for the instance with uid are "normal" in that they  
don't overlap.
	Distinct IP addresses are surprising unless you have so much churn  
and so little
	headroom that between 20:02:27 and 20:17:37 (just over 15 minutes),  
another client
	has already been given the address leased earlier.

	The leases given for the instance where the uid is missing show  
stranger behaviour.
	The first two leases are for consecutive, but contiguous time  
periods, yet are for
	different addresses.  This should only happen if your churn/headroom  
characteristic
	is such that in less than 1 second, another client has acquired the  
address.  The
	second and third leases overlap by 5 seconds.

	More is going on here than is apparent from the lease file.
	Can you extract the log entries for the addresses and corresponding  
times shown
	in your lease-file fragment?  This may help.


	Best regards,

	Niall O'Reilly
	University College Dublin IT Services

	PGP key ID: AE995ED9 (see www.pgp.net)
	Fingerprint: 23DC C6DE 8874 2432 2BE0 3905 7987 E48D AE99 5ED9



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