[CentOS] dhcpd errors

Tue Jan 16 19:36:19 UTC 2007
Ross S. W. Walker <rwalker at medallion.com>

> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Kanwar Ranbir Sandhu
> Sent: Tuesday, January 16, 2007 2:28 PM
> To: CentOS mailing list
> Subject: [CentOS] dhcpd errors
> Hello Everyone,
> I'm running a dhcp server on CentOS 4.4.  It's providing IPs 
> and remote
> booting for a number of thin clients.
> I've recently had problems rebooting a few thin clients.  Here is the
> error I've been seeing:
> Jan 16 14:16:45 at01 dhcpd: DHCPRELEASE from 
> 00:40:63:e5:71:4f specified
> requested-address.
> Jan 16 14:16:45 at01 dhcpd: DHCPRELEASE of from
> 00:40:63:e5:71:4f via eth0 (not found)
> Depending on the thin client, the MAC and the IP changes.  Otherwise,
> the errors are all the same.
> The effect on the thin client end is that it doesn't get an IP, and so
> it doesn't boot.  The usual remedy is to unplug/plug-in the cat5 cable
> at the thin client, or to move the thin client to another 
> network drop.
> This has me thinking there's a problem with the cat5 cabling 
> (the office
> is going through a major renovation).  But, I'm not 100% that is the
> case.  It could be a problem with the dhcp server.
> I don't have easy access to that office - it's remote, and 
> I'm only out
> there once every few months.  It's why I want to make sure it's not a
> software problem first.
> At the moment I have no clue what's going on.  My searching 
> with google
> hasn't turned up anything useful.
> I'd appreciate any comments/suggestions.

If you are using Cisco switches make sure that you have "spanning-tree
portfast" set for each PC/thinclient port, otherwise the spanning-tree
protocol negotiation phase might step on the DHCP offers.


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