[root@router dl]# rpm -q dhcp 
dhcp-3.0pl1-2 
 
The post install script, when going to dhcp-3.x from a  
dhcp-2.x series setup is not obvious on the position where the: 
 
   ddns-update-style ad-hoc; 
 
statement goes.  If present (understanding that /etc/dhcpd.conf is not present by default as a matter of policy  
from reading some of the prior Bugzilla, in which I concur) -- I suggest pre-pending the following; 
 
[ -e /etc/dhcpd.conf ] && { 
	cat - << END > /etc/dhcpd.conf.tmp 
# 
#	The following added, due to changed  /etc/dhcpd.conf syntax in dhcp, v. 3.0 and 
#	later.  See:   man dhcpd.conf 
ddns-update-style ad-hoc ; 
END 
	cat /etc/dhcpd.conf >> /etc/dhcpd.conf.tmp 
	mv /etc/dhcpd.conf.tmp /etc/dhcpd.conf  
	} 
 
--------------------------------------------------- 
 
[root@router dl]# service dhcpd restart 
Shutting down dhcpd: [FAILED] 
Starting dhcpd: Internet Software Consortium DHCP Server V3.0pl1 
Copyright 1995-2001 Internet Software Consortium. 
All rights reserved. 
For info, please visit http://www.isc.org/products/DHCP 
 
** You must add a ddns-update-style statement to /etc/dhcpd.conf. 
   To get the same behaviour as in 3.0b2pl11 and previous 
   versions, add a line that says "ddns-update-style ad-hoc;" 
   Please read the dhcpd.conf manual page for more information. ** 
 
If you did not get this software from ftp.isc.org, please 
get the latest from ftp.isc.org and install that before 
requesting help. 
 
If you did get this software from ftp.isc.org and have not 
yet read the README, please read it before requesting help. 
If you intend to request help from the dhcp-server 
mailing list, please read the section on the README about 
submitting bug reports and requests for help. 
 
Please do not under any circumstances send requests for 
help directly to the authors of this software - please 
send them to the appropriate mailing list as described in 
the README file. 
 
exiting. 
[FAILED] 
[root@router dl]# man dhcpd.conf 
[root@router dl]# joe /etc/dhcpd.conf 
Processing '/etc/joe/joerc'...done 
 
File /etc/dhcpd.conf not changed so no update needed. 
[root@router dl]# service dhcpd restart 
Shutting down dhcpd: [FAILED] 
Starting dhcpd: [  OK  ] 
[root@router dl]# head -20  /etc/dhcpd.conf 
# 
#       basement 
# 
        ddns-update-style ad-hoc; 
       shared-network basement { 
#       ddns-update-style ad-hoc; 
         subnet  172.16.33.0 netmask 255.255.255.0 { 
            option domain-name "basement.lan"; 
            option domain-name-servers 172.16.33.2, xx.xx.xx.xx, yy.yy.yy.yy ; 
            option routers 172.16.33.2; 
#               ddns-update-style ad-hoc; 
            allow unknown-clients; 
            max-lease-time 120000; 
            default-lease-time 12000; 
<snip>