H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – DHCP
H3C S7500 Series Ethernet Switches Chapter 2
DHCP Server Configuration
2-16
To do… Use the command… Remarks
Enter system view
system-view
—
interface interface-type
interface-number
dhcp server option code { ascii
ascii-string | hex hex-string&<1-10> |
ip-address ip-address&<1-8> }
Configure
the current
interface
quit
Configure
customize
d options
Configure
multiple
interfaces
in system
view
dhcp server option code { ascii
ascii-string | hex hex-string&<1-10> |
ip-address ip-address&<1-8> }
{ interface interface-type
interface-number [ to interface-type
interface-number ] | all }
Required
By default,
no
customized
option is
configured
2.4 DHCP Security Configuration
DHCP security configuration is needed to ensure the security of DHCP service.
2.4.1 Prerequisites
Before configuring DHCP security, you should first complete the DHCP server
configuration (either global address pool-based or interface address pool-based
DHCP server configuration).
2.4.2 Configuring Private DHCP Server Detecting
A private DHCP server on a network also answers IP address request packets and
assigns IP addresses to DHCP clients. However, the IP addresses they assigned may
conflict with those of other hosts. As a result, users cannot normally access networks.
This kind of DHCP servers are known as private DHCP servers.
With the private DHCP server detecting function enabled, when a DHCP client sends
the DHCP-REQUEST packet, the DHCP server tracks the information (such as the IP
addresses and interfaces) of DHCP servers to enable the administrator to detect
private DHCP servers in time and take proper measures.
Follow these steps to enable detection of a private DHCP server: