Nick has helped me simplify this install quite significantly, compared to the original instructions.
A Unix based DHCP Server is straightforward to configure and back up and is much, much less fussy and more reliable than running the Microsoft DHCP Service from a Windows Server. You can take my word for that..
Getting the files
This document has been revised for version 3.0.3 of ISC-DHCP (22.07.2005). Download the source file dhcp-3.0.3.tar.gz or its latest version, from http://www.isc.org/software/dhcp.
Installation
Perform a standard installation..
tar -zxvf dhcp-3.0.3.tar.gz
cd dhcp-3.0.3
./configure
make
make install
Configuration
Create the following files..
touch /var/db/dhcpd.leases
cp /src/dhcp-3.0.3/server/dhcpd.conf /etc
vi /etc/dhcpd.conf
Here's an example dhcpd.conf file..
# Andy's dhcpd.conf
default-lease-time 600;
max-lease-time 7200;
ddns-update-style ad-hoc;
# option definitions common to all supported networks..
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.50 192.168.0.90;
option routers 192.168.0.101;
option domain-name-servers 192.168.0.101;
option domain-name "domain.net";
}
# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
authoritative;
# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;
#Example reserved IP..
host wireless1.domain.net {
hardware ethernet 00:04:23:21:51:50;
fixed-address 192.168.0.100;
}
The above config file will give out IPs from 192.168.0.50 to 192.168.0.90 with a default Class C Subnet Mask of 255.255.255.0. I prefer to express the DNS Server and Gateway as IP Addresses rather than host names. Additionally an example of a reserved IP Address is shown, which would lock the specified IP to the specified MAC Address. Add a 4-5 line entry like this, per reserved IP.
Starting the DHCP service
The dhcpd daemon lives in /usr/sbin/dhcpd, which is in the system path. So to start the service, simply type:
dhcpd
Any configuration errors will be displayed - fix them before you can start the service. Success can be seen with a running dhcpd process..
ps -aux | grep dhcpd
root 1548 0.0 0.5 420 264 p0 D+ 11:08AM 0:00.00 grep dhcpd
To view the DHCP leases, type:
more /var/db/dhcpd.leases
This file can be edited to remove previous leases and will regenerate parts of itself when a lease is given out.
Finally, to run the daemon from startup we put an entry line into
rc.local..
vi /etc/rc.local
- A&N.
