3Com 3C13636 Configuration Manual page 421

3Com Router 3000 Ethernet Family
Configuration Guide
Ethernet1/0/1, that is, the interface for accessing the Internet has an IP address of
10.1.2.1/24. The DHCP server is configured with global address pool 10.1.1.0/24.
The DHCP server acts as the proxy gateway server for clients to access the
Internet at the same time.
II. Network diagram
Client
Figure 2-4 Network diagram for authorized ARP
III. Configuration procedure
# Enable DHCP.
[3Com] dhcp enable
# Configure interfaces to operate in DHCP server mode, and assign IP addreses from a
global address pool.
[3Com] dhcp select global interface ethernet 1/0/0 to ethernet 1/0/1
# Configure the network parameters and address pool on the DHCP server.
<3Com> system-view
[3Com]interface Ethernet 1/0/0
[3Com-Ethernet1/0/0] ip address 10.1.1.1 255.255.255.0
[3Com-Ethernet1/0/0] quit
[3Com] interface Ethernet 1/0/1
[3Com-Ethernet1/0/1] ip address 10.1.2.1 255.255.255.0
[3Com-Ethernet1/0/1] quit
[3Com] dhcp server ip-pool 0
[3Com-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0
# Enable authorized ARP for the DHCP global address pool.
[3Com-dhcp-pool-0] synchronize arp
[3Com-dhcp-pool-0] quit
# Enable ARP security, and configure an aging time of 120 seconds for authorized ARP
entries.
[3Com-Ethernet1/0/0] arp security
[3Com-Ethernet1/0/0] arp security time-out 120
Client Client
LAN
Ethernet1/0/0
10.1.1.1/24
Client
3Com Corporation
DHCP server
Ethernet1/0/1
10.1.2.1/24
2-15
Chapter 2 ARP Configuration
Internet