exceedingly long time in assigning ip addresses
Massimo Manghi
massimo.manghi at unipr.it
Mon Dec 13 15:41:09 UTC 2010
Hi
I've been lurking on the list for a while now hoping to see someone to
bring up this or a similar problem.
I'm managing a medium size network (a zone of a larger campus size
network) and I've used dhcp for assigning ip addresses for quite a long
time now. During the last year an increasing number of windows clients
are having problems when they are started up. IP address negotiation can
take as long as 30 mins while the dhcp log shows a series of the usual
messages, apparently displaying a flawless exchange
Dec 13 15:15:03 yyyyyy dhcpd: DHCPDISCOVER from 00:26:18:bc:fc:39 via eth0
Dec 13 15:15:03 yyyyyy dhcpd: DHCPOFFER on xxx.xxx.xxx.54 to
00:26:18:bc:fc:39 via eth0
Dec 13 15:15:03 yyyyyy dhcpd: DHCPREQUEST for xxx.xxx.xxx.54
(xxx.xxx.xxx.1) from 00:26:18:bc:fc:39 via eth0
Dec 13 15:15:03 yyyyyy dhcpd: DHCPACK on xxx.xxx.xxx.54 to
00:26:18:bc:fc:39 via eth0
these 4 messages are repeated every second for as long as necessary for
some magic event to eventually overcome the problem.
Since my organization prescribes that every ip must have a physical
person associated to it (to allow fast intervention in case the pc is
taken over by some trojan or virus or p2p software) my server has no
free leases, therefore every ip is statically linked to a mac address.
on this network another dhcp server exists, they manage a very small
group of clients belonging to a different ip zone (though they share the
same lan with my zone) and they too don't serve free leases.
not every client has this problem, this seem restricted to windows
clients located in a specific section of the building. This suggests an
interference between the 2 dhcp servers exists and the problem to be
matter of timing (being a server faster to respond than the other on
that section of the lan). Are there time parameters to be set that can
be adjusted to make the negotiation tolerant of these interferences?
thanks for any suggestion
-- Massimo
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