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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org,
 Pieter Donche <Pieter.Donche@ua.ac.be>
Date: Sat, 9 May 2009 23:13:45 +0200
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Cc: Derek Ragona <derek@computinginnovations.com>
Subject: Re: isc-dhcpd server, HOSTNAME
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On Saturday 09 May 2009 15:09:45 Pieter Donche wrote:

> case DHCP server             DHCP client       HOSTNAME env. var.
>
>   1   isc-dhcp30-server       FreeBSD7-i386     not set
>        on FreeBSD-amd64
>   2   isc-dhcp30-server       SuSE Linux 10.3   set
>        on FreeBSD-amd64
>
>   3   some DHCP server        FreeBSD7-i386     set
>        on unkown serverOS
>   4   some DHCP server        SuSE Linux 10.3   set
>         on unkown serverOS

Judging from this, you have a hostname set in /etc/rc.conf on freebsd 7 client 
and/or dhcpd isn't configured to send one as it receives one from the client 
and perhaps you have dynamic DNS configured?

If that's not the case, then you should add some debugging to /sbin/dhclient-
script in the check_hostname function.

-- 
Mel