In DHCP configuration, use of dhcpd

In the course of learning DHCP, we will certainly be exposed to configuration-related content. You will also learn content related to Linux. Many friends also found that dhcpd applications are involved in Linux DHCP configuration. Today, we mainly talk about the use of DHCP and dhcpd packages in Linux. So the test environment: RH linux 9.0 uses the common dhcpd package in linux. The latest version of dhcp3.0.5: download.

1. install the software: Install the/tmp directory first.

 
 

  
  
# Cd/tmp
  
  
# Gunzip dhcp-3.0.5.tar.gz
  
  
# Tar xvf after the dhcp-3.0.5.tar is unlocked, you will see a new sub-directory dhcp-3.0.5 under the Directory
  
  
# Cd dhcp-3.0.5 // enter this subdirectory
  
  
# Configure
  
  
# Make
  
  
# Make install dhcp
 
 

2. Configuration

 
 

  
  
The most important configuration work of the dhcp service is to configure/etc/dhcpd. conf and paste the configuration of the local machine.
  
  
/Etc/dhcpd. conf:
  
  
Default-lease-time 1296000;
  
  
# Maximum IP address expiration time
  
  
Max-lease-time 4000000;
  
  
Option subnet-mask limit 255.0;
  
  
# Subnet Mask
  
  
Option broadcast-address 192.168.0.255;
  
  
# Broadcast address of the Network
  
  
Option routers 192.168.0.254;
  
  
# Gateway address
  
  
Option domain-name-servers 211.151.48.59, 211.151.48.47;
  
  
# Domain name resolution address
  
  
Ddns-update-style ad-hoc;
  
  
Subnet 192.168.0.0 netmask 255.255.255.0 {
  
  
# Define the IP address pool content
  
  
Range 192.168.0.100 192.168.0.240;
  
  
# The IP address range is 100-240, with a total of 140 IP addresses.
  
  
}
  
  
# You can also specify an IP address based on the MAC address as follows:
  
  
# Host Jephe {hardware ethernet 00: a0: c9: a6: 96: 33; fixed-address 192.168.1.12 ;}
 
 

The dhcpd. conf file has been configured.

3. Start the service

 
 

  
  
#dhcpd 
 
 

That is, it can be started in command line mode.

Add the command to the startup.

Edit or create the/etc/rc. d/init. d/dhcpd file and write the following content:

 
 

  
  
#vi /etc/init.d/dhcpd  
  
  
. /etc/rc.d/init.d/functions  
  
  
. /etc/sysconfig/network  
  
  
 
  
  
# Check that networking is up.  
  
  
[ ${NETWORKING} = "no" ] && exit 0  
  
  
[ -f /usr/sbin/dhcpd ] || exit 0  
  
  
[ -f /etc/dhcpd.conf ] || exit 0  
  
  
 
  
  
RETVAL=0 
  
  
# See how we were called.  
  
  
case "$1" in  
  
  
start)  
  
  
 
  
  
# Start daemons.  
  
  
echo -n "Starting dhcpd: "  
  
  
daemon /usr/sbin/dhcpd eth1  
  
  
RETVAL=$?  
  
  
echo  
  
  
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/dhcpd  
  
  
;;  
  
  
 
  
  
stop)  
  
  
# Stop daemons.  
  
  
echo -n "Shutting down dhcpd: "  
  
  
killproc dhcpd  
  
  
RETVAL=$?  
  
  
echo  
  
  
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/dhcpd  
  
  
;;  
  
  
 
  
  
restart|reload)  
  
  
$0 stop  
  
  
$0 start  
  
  
RETVAL=$?  
  
  
;;  
  
  
 
  
  
status)  
  
  
status dhcpd  
  
  
RETVAL=$?  
  
  
;;  
  
  
 
  
  
*)  
  
  
echo "Usage: dhcpd {start|stop|restart|status}"  
  
  
exit 1  
  
  
esac  
  
  
exit $RETVAL 
 
 

The daemon/usr/sbin/dhcpd eth0 clause specifies that the machine in the IP segment of the NIC needs to be parsed.

If the second Nic is set to: eth1

Start and Stop using service commands

 
 

  
  
#service dhcpd start|stop|restart 
 
 

If no error is returned, the configuration file is correct.

Add to the startup service:

 
 

  
  
# Chkconfig -- add dhcpd
  
  
# Chkconfig -- level 2345 dhcpd on
  
  
# Chkconfig -- list dhcpd
  
  
# Dhcpd 0: Disable 1: Disable 2: Enable 3: Enable 4: Enable 5: Enable 6: Disable
 
 

The configuration is complete!