RedHat6.2 server configuration solution (III): DHCP

Article Title: RedHat6.2 server configuration solution (III): DHCP. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Author: Tang haijing
　　
Chapter III DHCP
3.1 Introduction
For those who do not know much about network technology, configuring TCP/IP may be a very complicated task. For those who connect a PC to a LAN, they can only concentrate their configurations on the server, this simplifies the complexity of the client. Of course, this will increase the workload of the Administrator to a certain extent, but it is optimal from the overall consideration.
　　
In this chapter, I will introduce how to configure Dynamic IP Address Allocation and Management, and explain how it works in easy-to-understand languages. I hope you can quickly become a qualified network administrator by reading this chapter.
　　
3.2 Required System Resources
3.2.1 configuration file:
　　
File Source
　　
/Etc/dhcpd. conf dhcp-2.0-5.i386.rpm->
　　
/Usr/doc/dhcp-2.0/dhcpd. conf. sample
　　
/Var/state/dhcp/dhcpd. leases administrator create
　　
3.2.2 related tools:
　　
File Source
　　
/Etc/rc. d/init. d/dhcpd dhcp-2.0-5.i386.rpm
　　
3.3 configuration Scheme
/Etc/dhcpd. conf IP Address Allocation master configuration file
　　
Role: contains many configuration commands, both for the server and for the client. It can use the dynamic IP Address Allocation technology to manage the entire subnet, or it can manage a client based on the static IP Address Allocation technology.
　　
Instance:
　　
Option domain-name "mycompany.com ";
　　
# Define the Domain Name of the DHCP server
　　
Option domain-name-servers 192.168.10.1;
　　
# Define the DNS server address
　　
Option subnet-mask limit 255.0;
　　
# Define the Subnet mask. If this option is not defined, use the Subnet mask in the Subnet command.
　　
Default-lease-time 1200;
　　
# If the client cannot request a specified lease period, use this parameter to define the lease duration of the address.
　　
Max-lease-time 87600;
　　
# It is used to specify the maximum lease time, although the lease time is determined by the client's request.
　　
Subnet 192.168.10.0 netmask 255.255.255.0
　　
# Specify the subnet CIDR Block and subnet mask
　　
{
　　
Range 192.168.10.2 192.168.10.110
　　
# Specifying the IP address range of a subnet
　　
Option broadcast-address 192.168.10.255;
　　
# Specify the subnet broadcast address
　　
Option routers 192.168.10.1;
　　
# IP address of the specified vro
　　
}
　　
Host fantasia {
　　
Hardware ethernet 00: 50: BA: CA: 2E: D2;
　　
Fixed-address 192.168.1012;
　　
}
　　
# Assign a permanent IP address to the client
　　
3.4 test and management methods
1. After the Administrator modifies the configuration file, run/etc/rc. d/init. d/dhcpd restart to make the change take effect.
　　
2. on Windows 98 client, you need to configure TCP/IP to automatically search for IP addresses.
　　
3. On the Windows 98 client, you can run winipcfg to dynamically apply for an IP address.
　　
4. The administrator can view the/var/state/dhcp/dhcpd. leases file to supervise the allocation of IP resources.
　　
3.5 summary of this Chapter
After studying this chapter, you must feel that the DHCP configuration is very simple. To a certain extent, this is because I want to introduce a master server with a subnet, which is the simplest network topology. If it is more complex with multiple subnets, it is more troublesome to configure it. Therefore, you need to configure a relay proxy (dhcrelay) for each subnet. Its documentation can be found in Linux.