User's Manual

Table Of Contents
409
Users Manual of CS-6306R
interface vlan11
ip address 192.168.15.17 255.255.255.240
ip nat inside
!
ip access-list standard a2
permit 192.168.15.1 255.255.255.0
Configuring DHCP 43.3
43.3.1 Introduction
The Dynamic Host Configuration Protocol (DHCP) provides some parameters of network configuration fro
hosts in the Internet. DHCP will be described in RFC 2131. The most important function of DHCP is to
distribute IP addresses on the interface. DHCP supports three mechanisms of distributing IP addresses.
Automatic distribution
The DHCP server automatically distributes a permanent IP address to a client.
Dynamic distribution
The DHCP server distributes an IP address for a client to use for a certain period of time or until the client
does not use it.
Manual distribution
The administrator of the DHCP server manually specifies an IP address and through the DHCP protocol
sends it to the client.
43.3.1.1 DHCP Applications
DHCP has several kinds of applications. You can use DHCP in the following cases:
You can distribute IP address, network segment and related sources (such as relevant gateway) to an
Ethernet interface by configuring the DHCP client.
When a switch that can access DHCP connects multiple hosts, the switch can obtain an IP address from
the DHCP server through the DHCP relay and then distribute the address to the hosts.
43.3.1.2 DHCP Advantages
In current software version, the DHCP client or the DHCP client on the Ethernet interface is supported. The
function to support the DHCP client has the following advantages:
Reducing the configuration time
Reducing configuration faults
Controlling IP addresses of some device ports through the DHCP server