How to set up DHCP in Linux

How Linux sets up DHCP

Environment: RH Linux 9.0 uses DHCPD packages that are commonly used under Linux.

Latest Version dhcp3.0.5: Download

1, installation: first copy dhcp-3.0.5.tar.gz software to/tmp directory

#cd/tmp

#gunzip dhcp-3.0.5.tar.gz

#tar XVF Dhcp-3.0.5.tar, you will see a new subdirectory under this directory dhcp-3.0.5

#cd dhcp-3.0.5//Enter the subdirectory

#configure

#make

Installing DHCP #make Install

2. Configuration

The most important configuration of the DHCP service is to configure the/etc/dhcpd.conf content to now post the configuration of the local machine.

/etc/dhcpd.conf:

Default-lease-time 1296000;

#IP最长失效时间

Max-lease-time 4000000;

Option Subnet-mask 255.255.255.0;

#子网的掩码

Option broadcast-address 192.168.0.255;

#网络的广播地址

Option routers 192.168.0.254;

#网关的地址

Option Domain-name-servers 211.151.48.59,211.151.48.47;

#域名解析地址

Ddns-update-style Ad-hoc;

Subnet 192.168.0.0 netmask 255.255.255.0 {

#定义IP池的内容

Range 192.168.0.100 192.168.0.240;

#地址范围为 100-240 A total of 140 IP addresses.

}

#也可以象下面一样按MAC地址指定IP

#host jephe {hardware Ethernet 00:a0:c9:a6:96:33;fixed-address 192.168.1.12;}

Configure the dhcpd.conf file to complete.

3. Start the service

#dhcpd

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

The following command can be added to the boot.

Edit or create a new/ETC/RC.D/INIT.D/DHCPD file to write the following:

#vi/ETC/INIT.D/DHCPD. /etc/rc.d/init.d/functions. /etc/sysconfig/network# Check that networking are up. [${networking} = "No"] && exit 0[-F/USR/SBIN/DHCPD] | | Exit 0[-f/etc/dhcpd.conf] | | Exit 0retval=0# See how we were Called.case "$" 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) stop$0 startretval=$?;; Status) status dhcpdretval=$?;; *) echo "USAGE:DHCPD {start|stop|restart|status}" exit 1esacexit $RETVAL

Where DAEMON/USR/SBIN/DHCPD eth0 This sentence to specify the need for that network card in the IP segment of the machine to parse.

If the second NIC is set to: eth1

Start and stop using the service command

#service DHCPD Start|stop|restart

Error-Free Output the configuration file is correct.

To join the startup service:

#chkconfig--add DHCPD

#chkconfig--level 2345 DHCPD on

#chkconfig--list DHCPD

#dhcpd 0: Off 1: Off 2: Enable 3: Enable 4: Enable 5: Enable 6: Off

How to set up DHCP in Linux