linux[Base]-34-[DHCP Server]-[Dynamic Host Management Protocol]-[01]

Source: Internet
Author: User
Tags domain server

Dhcp

DHCP Dynamic Host Management protocol based on UDP Protocol and limited to network protocol for LAN

Purpose: Automatic distribution for internal network devices or Internet providers IP Address

Typically applied in a large LAN environment

Benefits: Centralized Management IP addresses to reduce management and maintenance costs and increase efficiency

Common terminology for DHCP service programs:

scope: A complete IP address segment,DHCP manages assigning IP addresses according to scope

superscope: Used to support multiple logic on the same physical network IP Address subnet segment, containing a list of scopes, including management of child scopes

Exclusion Range: set some IP addresses are excluded from the scope and are not obtained by the DHCP client

address pool: Defines a DHCP scope and applies an excluded address to be assigned to the DHCP client

Lease:DHCP client gets IP address usage time

Appointment: Ensure that specific devices in the subnet are always getting the same IP Address

Install the DHCPD service program:

[[email protected] ~]# yum-y Install DHCP

DHCPD Service Program and configuration file :

Master configuration file

/etc/dhcp/dhcpd.conf

Execute the program

/usr/sbin/dhcpd

/usr/sbin/dhcrelay

a standard DHCP configuration file should include global configuration parameters, subnet segment declarations, address configuration options, address configuration parameters

Global configuration parameters are used to define global parameters for the entire configuration file, while the subnet segment declaration is used to configure the address properties of the entire subnet segment

Parameters

Role

Ddns-update-style Type

Defines the type of dynamic update for the DNS service, including:

None(dynamic update not supported),intermi(interactive update mode),Ad-hoc(Special update mode)

Allow/ignore client-updates

Allow / Ignore client update DNS records

Default-lease-time 21600

Default Time-out

Max-lease-time 43200

Maximum timeout time

Option Domain-name-server Ip-addres

Define DHS server addresses

option Domain-name " name "

Define DHS domain names

Range

Define an address pool for assigning IP

Option Subnet-mask

Defining subnet masks for clients

Option routers

Define the gateway for the client

Broadcase-address Broadcast Address

Define the broadcast address of the client

Ntp-servers IP Address

Define the client's network time server (NTP)

Nis-servers IP Address

Define the address of the NIS domain server

Hardware hardware type MAC is in a hurry!

Specify the type of NIC interface and mac address

Server-name Host name

Notifies the DHCP client server of the host name

Fixed-address IP Address

Assigning a fixed IP address to a specified host

Time-offset Offset Difference

Specify the offset difference between the client and Greenwich

Simulation Experiment :

tomorrow, there are about six external colleges bring their own notebooks to our training, please ensure that students can correctly obtain IP address and normal Internet access

The computer room network segment parameters are as follows:

Parameter name

Value

Default Lease Time

21600

Maximum lease time

43200

IP address range

192.168.200.20-192.168.200.100

Subnet mask

255.255.255.0

Gateway

192.168.200.1

DNS Server Address

192.168.200.103

Search domain

Linuxs.com

To configure a DHCP configuration file:

[Email protected] ~]# vim/etc/dhcp/Dhcpd.confddns-update-style none; #设置dhcp服务不自动动态更新Ignore client-updates; #忽略客户机更新dns记录Subnet192.168.200.0Netmask255.255.255.0{#作用域为 192.168.200.0/ 24 Network segment range192.168.200.20 192.168.200.100;#地址池: 20-100option Subnet-mask255.255.255.0;#子网掩码:option Routers192.168.200.1;#网关: 192.168.200.1option Domain-name"linuxs.com"; #默认搜索域option domain-name-servers192.168.200.103; #dns地址default-lease-time21600; #默认租约Max-lease-time43200; #最大租约Host Print {hardware Ethernetxx: 0C: in: FC:FF:B8; #绑定MAC地址
        fixed-address192.168.200.88; #静态IP地址}}

Restart DHCPD service Verification :

[Email protected] ~~'/usr/lib/systemd/system/dhcpd.service' ' /etc/systemd/system/multi-user.target.wants/dhcpd.service '

  

linux[Base]-34-[DHCP Server]-[Dynamic Host Management Protocol]-[01]

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