RHEL7 Building DHCP

This experiment uses VMWARE12 environment, the network card is-custom VMnet3

Network environment:

One server (DHCP), two clients, one of which is used as a printer, fixed IP (based on MAC address)

Requirements Description:

The host name of the 1:DHCP server is dhcpsvr.mvp.com IP address: 172.35.35.1/24

2: Automatically assign IP to each host in the network, address range 172.35.35.20-172.35.35.240

3: The default gateway address for each host in LAN is 172.35.35.254

4: The DNS server address used by the LAN is the host name of the 172.35.35.5 and 172.35.35.6,dns servers, respectively, ns1.mvp.com ns2.mvp.com

5: Network printer device, host name print01, requires automatic assignment of fixed IP 172.35.35.10

01. Setting Up DHCP network card information

cd/etc/sysconfig/network-scripts/

Configure default NIC Information

02. Modify the network hostname/etc/sysconfig/network

03, modify the Machine hosts/etc/hosts

04. Restart the Network

Systemctl Restart Network

Install DHCP

Yum install-y DHCP

Refer to DHCP

Find/usr/share/doc-name *dhcpd.conf*

Vim/etc/dhcpd/dhcpd.conf

Authoritative;ddns-update-style interim;subnet172.35.35.0Netmask255.255.255.0{Range172.35.35.20 172.35.35.240; Option Domain-name-servers ns1.mvp.com,ns2.mvp.com; Option Domain-name"dhcpsvr.mvp.com"; Option Routers172.35.35.254;
Default-lease-time 86400; #1day
Max-lease-time 604800; #7day}host print01 {hardware Ethernetxx: -: About: 2D: on: -; fixed-address172.35.35.10;}

05. Setting Up DHCP service

Systemctl Enable DHCPD = = Chkconfig dhcpd on

Systemctl start DHCPD

Log query

Systemctl Status Dhcpd-l

/var/log/messages

The DHCP client information is logged in the/var/lib/dhcpd/dhcpd.leases

06. Test Results

Printer (XP)

Client

Configuration parameter meaning

Modify configuration File/etc/dhcp/dhcpd.conf
As follows:

Supported DHCP dynamic update modes (non: not supported;interim: Interactive update mode ; AD-HOC: Special update mode)
Ddns-update-style Interim;
#ignore client-updates;

#subnet < sub-network number > Netmask < subnet mask;:
Subnet 192.168.1.0 netmask 255.255.255.0 {
#指定地址池, the IP addresses within the 192.168.1.20~192.168.1.254 range are dynamically assigned to the client
range 192.168.1.20 192.168.1.254;

Option routers 192.168.1.1; #客户端默认网关为192.168.1.1
Option Subnet-mask 255.255.255.0; #指定客户端子网掩码

Option Domain-name "example.com"; #指定DNS后缀
Option Domain-name-servers *.*.*.*; #DNS服务器地址
Option broadcast-address 192.168.1.255; #指定广播地址

Default-lease-time 86400; #指定默认租约时间, Unit is seconds default 1 days
Max-lease-time 172800; #指定最长租赁时间, Unit is seconds

#为网络适配器的物理地址为00:0C:29:23:F5:A2 host retains the specified IP address
Host PC1 {
Hardware Ethernet 00:0c:29:d4:e7:58;
Fixed-address 192.168.1.50;
}
}

Set the default NIC IP to the same network segment
Modified:/etc/sysconfig/network-scripts/ifcfg-eth0 "file as follows:
Device= "Eth0"
Nm_controlled= "Yes"
Onboot=yes
Type=ethernet
bootproto= "Static"
ipaddr=192.168.1.1
Prefix=24
gateway=x.x.x.x

dns1=x.x.x.x
Defroute=yes
Ipv4_failure_fatal=yes
Ipv6init=no
Name= "System eth0"

Set parameters:
Default-lease-time Time: Lease time&NBSP;
Max-lease-time time: Longest lease time Option domain-name "domain name": Set the domain name   for DHCP client resolve.conf internal parsing;
Option Domain-name-servers IP1, IP2: Set Ip  for DHCP client Resolve.confneo;
 option Routers: Set Routing information &NBSP;
  Declare IP address pool and related configuration: &NBSP;
Subnet network_ip netmask netmask_ip { 
Range IP1 IP2; set IP range &NBSP;
Host hostname {//static IP settings &NBSP;
hardware Ethernert hardware address; &NBSP;
Fixed-address ip;&NBSP;
};&NBSP;
}

Summary: In fact, many examples of dhcpd.conf.example, it is worth learning more!

Reference article:

Http://www.linuxidc.com/Linux/2013-06/86531.htm

Http://www.linuxidc.com/Linux/2012-08/68884.htm

Http://www.linuxidc.com/Linux/2013-04/82244.htm

RHEL7 Building DHCP