Yeah, it seems to be the case that enough traffic was being generated to delay the dhcp leases that the client computers were giving up. I used dhcping to watch and witnessed it in action. Moving dhcp to another server solved the issue. Likely I'll be moving some other services off that server soon to cut down on other "hotspot" related problems.

James Tanis
Technical Coordinator
Computer Science Department
Monsignor Donovan Catholic High School

On Sep 20, 2009, at 10:41 PM, Olivier Nicole wrote:

Hi James,

I have a FreeBSD 7.0 gateway/server with isc-dhcpd 3.1.2p1_2. Late
yesterday I began having some unique and intermittent issues.
Basically, random computers will all of a sudden lose their dhcp
leases and be unable to contact the dhcp server.

I did not see any reply to your question.

It happened to me that a secondary switch was working badly with
DHCP. If I rebooted the switch, it would work for a while, then fail
again. But that was a sort of random failure, some ports would be
affected sometime. The problem would occur a the first lease in the
morning rather than at renewal time.

As it was a cheap switch, unmanageable, I replaced it.

Sep 17 14:03:15 grendel dhcpd: ICMP Echo reply while lease valid.
Sep 17 15:25:19 grendel dhcpd: ICMP Echo Reply for late
or spurious.

which doesn't seem particularly relevant or heinous. Many more
computers than the ones above have been affected.

I don't remember ever seeing such error, but I would think that late
or spurions is not that innocent: it could be the symptom of a switch
not working at its nominal speed.

Of  course you could  also consider  a computer  on that  switch being
infected by some kind of virus and generating so much traffic it takes
your switch out.



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