> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Kanwar Ranbir Sandhu
> Sent: Tuesday, January 16, 2007 2:28 PM
> To: CentOS mailing list
> Subject: 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 10.1.1.150 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.
-Ross
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