Linux DHCP server

Linux DHCPServer

1.1.installationDhcp

Yum Install dhcp*-y

1.2.Dhcpconfiguration file

[Email protected] ~]# ls/etc/dhcp/

DHCLIENT.D dhcpd6.conf dhcpd.conf

[Email protected] ~]# vi/etc/dhcp/dhcpd.conf

#

# DHCP Server Configuration file.

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

# See ' Mans 5 dhcpd.conf '

# dhcpd.conf

#

# Sample configuration file for ISC dhcpd

#

# option definitions common to allsupported networks ...

optiondomain-name "example.org"; # Configure the domain name of the work

optiondomain-name-servers 202.96.128.86,202.96.134.133; # Configure multiple DNS servers separated by commas

default-lease-time600; # Lease time of ten seconds

max-lease-time7200; # 2H minutes

# Use this to enble/disable dynamic dnsupdates globally.

#ddns-update-style None;

# If This DHCP server was the official dhcpserver for the local

# Network, the authoritative directiveshould be uncommented.

#authoritative;

# Use this to send DHCP log messages to adifferent log file (you also

# has to hack syslog.conf to complete the redirection).

Log-facility Local7; # Log Level

# No Service would be given on this subnet,but declaring it helps the

# DHCP Server to understand the networktopology.

# Specify a network number, a subnet mask, and a range assignment in curly braces .

# multiple segments can write multiple lines

# This is a very basic subnet declaration.

subnet192.168.1.0 netmask 255.255.255.0

{

Range 192.168.1.100 192.168.1.200;

Option Domain-name-servers 192.168.1.10; #

Option Domain-name "hdbattery.cn";

option routers 192.168.1.1; # Gateway

option broadcast-address 192.168.1.255; # broadcast address

Default-lease-time 600;

Max-lease-time 7200;

}

# The following configuration is for fixed allocation of MAC binding

Hostfantasia

{

Hardware Ethernet 08:00:07:26:C0:A5;

Fixed-address 192.168.1.100;

}

# You can declare a class of clients andthen do address allocation

# based on that. The example below shows a case where allclients

# in a certain class get addresses on the10.17.224/24 subnet, and all

# Other clients get addresses on THE10.0.29/24 subnet.

Class "Foo" {

Match if substring (option vendor-class-identifier, 0, 4) = "SUNW";

}

Shared-network 224-29 {

Subnet 10.17.224.0 netmask 255.255.255.0 {

option routers rtr-224.example.org;

}

Subnet 10.0.29.0 netmask 255.255.255.0 {

option routers rtr-29.example.org;

}

Pool {

Allow members of "Foo";

Range 10.17.224.10 10.17.224.250;

}

Pool {

Deny members of "Foo";

Range 10.0.29.10 10.0.29.230;

}

}

To test the configuration file syntax:

Service DHCPD Configtest

# Test if the DHCP syntax is normal

Service DHCPD Restart

# reboot after configuration

########################## Simple configuration file ################################

Ddns-update-styleinterim;

Ignoreclient-updates;

next-server192.168.1.11;

FileName "pxelinux.0";

allowbooting;

ALLOWBOOTP;

subnet192.168.0.0 netmask 255.255.255.0 {

Optionrouters 192.168.0.1

Optionsubnet-mask 255.255.255.0;

Optiondomain-name-servers 8.8.8.8,114.114.114.114;

Range DYNAMIC-BOOTP 192.168.0.100 192.168.0.200;

Hostns {

Hardware Ethernet 00:12:a0:2d:81;

Fixed-address 192.168.0.101;

}

}

##################################################################################### #3

1.3.Services and Ports

DHCP Port:67 68

1.4.Firewall Configuration

turn on the firewall Dhcp

Iptable-i INPUT 1-p TCP--dport 67-jaccept

Iptable-i INPUT 1-p UDP--dport 67-jaccept

Iptable-i INPUT 1-p TCP--dport 68-jaccept

Iptable-i INPUT 1-p UDP--dport 68-jaccept

1.5.ViewDhcpAssigning distribution Information

Cd/var/lib/dhcpd

Cat dhcpd.leases

1.6.Client-sideDhcpGet information

cd/var/lib/dhclient/

Cat dhclient.leases

1.7.whenDhcpwhen a server is multi-interface, a specific interface is limitedDhcpService

Vi/etc/sysconfig/dhcpd

# Command Line Options here

Dhcpdargs= ' eth0 ' # Specify interface

1.8.Remote boot

Ether-wake-i eth0 00:11:22:33:44:55

1.9.Step Essence¡ï ★

1.10.Fault Error:

1: Permissions issues?

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[[Email protected]]# VI/ETC/RC.D/INIT.D/DHCPD

User=root

Group=root

2. Interface Issues

Not configured Tolisten on any interfaces!

1. Configuring a fixed IP address

2. Check if hsot ns {} in dhcpd.cnf is bound

3.vi/etc/sysconfig/dhcpd

This article is from the Linux Technical Exchange blog, so be sure to keep this source http://zhongliang.blog.51cto.com/4507905/1878840

Linux DHCP server