DHCP & PXE boot workstations
Niall O'Reilly
Niall.oReilly at ucd.ie
Fri Mar 23 14:15:23 UTC 2007
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (Darwin)
iD8DBQFGA+EAeYfkja6ZXtkRAq2hAJ9XDGs5wau89AdqrD0R4mVB54BAvACfWruj
jf3VkRPb0XX+65139ETC++o=
=JXDN
-----END PGP SIGNATURE-----
More information about the dhcp-users
mailing list