Simple DHCP settings in Linux

Article Title: simple DHCP settings in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

Environment: RH linux 9.0 uses common dhcpd packages in linux.

Latest Version 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 0RETVAL=0# See how we were called.case "$1" instart)# Start daemons.echo -n "Starting dhcpd: "daemon /usr/sbin/dhcpd eth1RETVAL=$?echo[ $RETVAL -eq 0 ] && touch /var/lock/subsys/dhcpd;;stop)# Stop daemons.echo -n "Shutting down dhcpd: "killproc dhcpdRETVAL=$?echo[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/dhcpd;;restart|reload)$0 stop$0 startRETVAL=$?;;status)status dhcpdRETVAL=$?;;*)echo "Usage: dhcpd {start|stop|restart|status}"exit 1esacexit $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!