Simple DHCP server configuration in Red Hat Enterprise 6.5

I. Experiment Topology

Rhel6.5

-------------- Rhel6.5 server (vmnet4) ------------- rhel6.5 client (vmnet4)

Prepare the network service lab environment
1. install two rhel6.5 virtual machines
1) Memory 1 GB, hard disk 80 GB, software package (desktop, development tools)
2) disable the firewall and SELinux Mechanism
Tip: Modify/etc/SELinux/config and set SELinux = permissive.
Getenforce, setenforce
3) install vmware-Tools
Tip: C: \ Program Files (x86) \ VMware Workstation \ Linux. ISO
4) network configuration: vmnet4, svr5.tarena.com 192.168.4.5/24
Tip: Disable the NetworkManager service.
Modify the ifcfg-eth0 file, onboot = Yes, nm_controled = No
5) configure the yum repository to ensure availability
[[Email protected] ~] # Vim/etc/yum. Repos. d/rhel6.repo
[RHEL-packages]
Name = rhel6
Baseurl = file: // MISC/CD
Enabled = 1
Gpgcheck = 1
Gpgkey = file: // etc/pki/rpm-GPG-key-RedHat-release

Tutorial procedure:

1. Set the IP address of the server

[[Email protected] ~] # Cat/etc/sysconfig/network-scripts/ifcfg-eth0// Set the Server IP Address

# Intel Corporation 82545em Gigabit Ethernet controller (copper)

Device = eth0

Bootproto = none

Onboot = Yes

Hwaddr = 00: 0C: 29: 5D: A8: 80

Ipaddr = 192.168.4.5

Prefix = 24

[[Email protected] ~] # Cat/etc/sysconfig/Network// Set the Server Gateway

Networking = Yes

Networking_ipv6 = Yes

Hostname‑ser5.tar ena.com// Host name

Gateway = 192.168.1.254

[[Email protected] ~] # Cat/etc/resolv. conf// Set the DNS server address

Search tarena.com

Nameserver 202.106.0.20, 8.8.8.8

[[Email protected] ~] # Service network restart// Restart the network service

[[Email protected] ~] # Chkconfig network on// Start the network

Note: In Red Hat Enterprise 5.10, changing the host name takes effect immediately. I wonder why the host name takes effect only after the host name is restarted in 6.5.

Verification:

[[Email protected] ~] # Ifconfig eth0// Check whether the IP address is correct

[[Email protected] ~] # Route-n// Check whether the gateway is enabled

[[Email protected] ~] # Hostname// Check whether the host name is correct

2. install the software package

[[Email protected] ~] # Rpm-Q DHCP// Check whether DHCP is installed

[[Email protected] ~] # Yum-y install DHCP// Install DHCP

[[Email protected] ~] # Rpm-Q DHCP

Dhcp-3.0.5-31.el5_8.1

3. modify the configuration file

Note: DHCP master configuration file template location/usr/share/doc/DHCP-*/DHCPD. conf. Sample

[[Email protected] ~] # Vim/etc/DHCPD. conf// Configure the DHCP address pool, gateway, DNS, and address

1 ddns-Update-style none;

2 default-lease-time 21600;// Default lease period

3 max-lease-time 43200;// Maximum lease period

4 Option subnet-mask limit 255.0;// Subnet Mask

5 option domain-name "tarena.com ";// Domain Name

6 Option domain-name-servers 202.106.0.20, 8.8.8.8;// DNS server address

7 subnet 192.168.1.0 netmask 255.255.255.0 {// Declare the CIDR Block

8 option routers 192.168.1.254;// Default gateway address

9 range dynamic-BOOTP 192.168.1.10 192.168.1.20;// Ip address allocation range

}

10 host pc205 {// Set the reserved address and recognize the name

 

11 hardware Ethernet 00: 0C: 30: E1: F5: 25;// Client MAC address

12 fixed-address 192.168.4.250;// Fixed IP Address

13}

4. Start the service

[[Email protected] ~] # Rpm-ql dhcp | grep init. d// View the service name

/Etc/rc. d/init. d/DHCPD

/Etc/rc. d/init. d/dhcrelay

[[Email protected] ~] # Service DHCPD restart// Restart the DHCP service

[[Email protected] ~] # Chkconfig DHCPD on// Set the DHCP service to automatically start upon startup

5. Verify

Linux:

# Dhclient-D eth0// Temporary access

# Dhclient-r eth0// Release

Windows:

Start> RUN> cmd> ipconfig/release// Release the IP address

Start> RUN> cmd> ipconfig/Renew// Obtain the IP address again

Restrict listening interfaces:
[[Email protected] ~] # Vim/etc/sysconfig/DHCPD
Dhcpdargs = "eth1"