Adding an ISC DHCP server with DDNS (CentOS 5.5)

Adding an ISC DHCP server with DDNS (CentOS 5.5)

Ref. http://dnsknowledge.com/tutorials/centos-tutorials/bind-9/howto-setup-dynamic-dns-ddns/

BIND (DDNS) server is already in place and running.

Built server with server package only.

Install DHCP package:

yum update dhcp

Create rndc.key:

touch /etc/rndc.key

Edit rndc.key to use the same key being used by BIND:

key "rndckey" {

       algorithm hmac-md5;

       secret "h7mAgf+HKPCSzBCBW4Wjiw==";

};

Edit dhcpd.conf as follows:

vi /etc/dhcpd.conf

#

# DHCP Server Configuration file.

#   see /usr/share/doc/dhcp*/dhcpd.conf.sample 

#

authoritative;

ddns-update-style interim;

allow client-updates;

include "/etc/rndc.key";

zone mydomain.local. {

       # Set the IP address of the name server whose zone information is to be updated

       # 192.168.1.103 == is your primary master bind 9 server

       primary 192.168.1.103;

       # and the key to use

       key rndckey;

}

# update the reverse lookup zone

zone 1.168.192.in-addr.arpa. {

       primary 192.168.1.103;

       key rndckey;

}

subnet 192.168.1.0 netmask 255.255.255.0 {

# --- default gateway

       option routers             192.168.1.1;

       option subnet-mask         255.255.255.0;

#      option nis-domain          "domain.org";

       option domain-name         "mydomain.local";

       option domain-name-servers 192.168.1.103, 192.168.1.104;

       option time-offset         -21600;       # Central Standard Time

#      option ntp-servers         192.168.1.1;

#      option netbios-name-servers 192.168.1.1;

# --- Selects point-to-point node (default is hybrid). Don't change this unless

# -- you understand Netbios very well

#      option netbios-node-type 2;

       range dynamic-bootp 192.168.1.10 192.168.1.20;

       default-lease-time 21600;

       max-lease-time 43200;

       # we want the nameserver to appear at a fixed address

#      host ns {

#             next-server marvin.redhat.com;

#             hardware ethernet 12:34:56:78:AB:CD;

#             fixed-address 207.175.42.254;

#      }

}

Configure DHCP for automatic startup:

/sbin/chkconfig –level 35 dhcpd on

/sbin/chkconfig –list dhcpd

Start dhcpd daemon:

/sbin/service dhcpd start

Test:

tail –f /var/log/messages

Add dhcp  A record to dns1 (don’t forget to change serial number)

rndc freeze mydomain.local

vi /var/named/chroot/var/named/slaves/mydomain.local.zone.db

rndc thaw mydomain.local

rndc reload