Summary of DHCP server configuration under Linux

This blog only demonstrates DNCP server installation and other practices, DHCP theory knowledge points are not described here in detail, want to know about Google, this article includes the installation of the configuration of the DHCP server, and set the DHCP reservation address

1. Install the DHCP package

    yum list all | grep dhcp #  View DHCP Packages          # DHCP: DHCP server-side packages     yum -y  install dhcp    rpm -ql dhcp #  See what files are generated          /USR/SBIN/DHCPD  # DHCP Server Programs          /USR/SBIN/DHCRELAY # DHCP Repeater         #  Generally DHCPD and dhcrelay cannot be used together         /var/lib/dhcpd/dhcpd.leases #   (lease) is used to record which MAC address the address is assigned to the host         /etc/rc.d/init.d/dhcpd #  DHCP Service Scripts         /etc/rc.d/init.d/dhcrelay          /etc/sysconfig/dhcpd #  Service script configuration file          /etc/sysconfig/dhcrelay

2. Edit the DHCP configuration file

Description: After the DHCP installation is complete, DHCP provides a template for the configuration file, where only the template path hint information

A simple description of the DHCP configuration file:

Ddns-update-style interim: How Dynamic DNS is updated

Ignore Client-updates: Ignore client update

Subnet 192.168.134.0 netmask 255.255.255.0: Subnet information, define IP address pool, can allocate multiple

Option routers: Default gateway Address

Option Subnet-mask: Subnet mask

Option domain-name: Domain name, search domain

Option Domain-name-servers:dns server address, multiple uses "," separated, up to three for Linux

Range: Specify an address pool assignable address range

Default-lease-time: Default Lease length

Max-lease-time: Maximum lease length

Host: Define a reserved address

    cat /etc/dhcpd.conf #  View template path information     cp /usr/ share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf #  Copy Template     vim / etc/dhcpd.cof    #  after editing the content as follows:    ddns-update-style interim;     ignore client-updates; (instruction type format)          Option (Options type format)         subnet 192.168.134.0 netmask  255.255.255.0 {        # --- default gateway             option routers                   192.168.134.1;             option subnet-mask               255.255.255.0;                 option nis-domain                 "domain.org";             option domain-name                "tb.com";             option  domain-name-servers      192.168.134.2;                 option time-offset               -18000; # eastern standard  Time    #       option ntp-servers               192.168.1.1;    #        option netbios-name-servers     192.168.1.1;    #  --- Selects point-to-point node  (default is hybrid) .     # don ' T change this unless# -- you understand netbios very  well    #       option netbios-node-type  2;                range  192.168.134.30 192.168.134.40;             default-lease-time 21600;             max-lease-time 43200;                 # we want the nameserver to appear at a fixed address             host ns {                     hardware ethernet  00:0c:20:bb:f2:85;                     fixed-address 192.168.134.36;             }                }

3. Enable DHCP service

Service DHCPD Start

4. Test the DHCP server

1. Set the IP address acquisition mode to dynamic acquisition and restart the network service in another virtual machine

2. View the test results in the DHCP server:

Author test results

Client:

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DHCP server side: It is important to note that there is no record of the use of the reserved address method to obtain IP address information

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3. If the IP address obtained by the client is not an address in the specified range of DHCP address pool, the reserved address can be used.

Due to the high priority of the reservation address, the client that specifies the MAC address after the general setting can obtain the specified IP.

VIM/ETC/DHCPD.CONF # set reserved address instance: Host NS {hardware Ethernet 00:0c:29:f5:41:03;            Fixed-address 192.168.134.37; }

5. View the process of client acquiring IP

Ifconfig eth0 down dhclient-d

Author execution results:

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The above is a personal summary of the DHCP server knowledge points, the omission also hope to point out

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Summary of DHCP server configuration under Linux