Common proxy ARP configuration example
Network requirements
As shown in Figure 8, Host A and Host D have the same IP prefix and mask (IP addresses of Host A and Host D are 192.168.10.100/16 and 192.168.20.200/16 respectively), but they are located on different subnets separated by the switch (Host A belongs to VLAN 1 while Host D belongs to VLAN 2). As a result, Host D cannot receive or respond to any ARP request from Host A.
You must configure proxy ARP on the switch to enable communication between the two hosts.
Figure 8: Network diagram
Configuration procedure
# Create VLAN 2.
<Switch> system-view [Switch] vlan 2 [Switch-vlan2] quit
# Specify the IP address of interface VLAN-interface 1.
[Switch] interface vlan-interface 1 [Switch-Vlan-interface1] ip address 192.168.10.99 255.255.255.0
# Enable proxy ARP on interface VLAN-interface 1.
[Switch-Vlan-interface1] proxy-arp enable [Switch-Vlan-interface1] quit
# Specify the IP address of interface VLAN-interface 2.
[Switch] interface vlan-interface 2 [Switch-Vlan-interface2] ip address 192.168.20.99 255.255.255.0
# Enable proxy ARP on interface VLAN-interface 2.
[Switch-Vlan-interface2] proxy-arp enable
After completing preceding configurations, use the ping command to verify the connectivity between Host A and Host D.