3Com 10014299 Define a static ARP mapping, Arp static ip-address, Undo arp static ip-address

21 CONFIGURING IP APPLICATION

This chapter contains information on the following topics:

■Configure Address Resolution Protocol (ARP)

■Configure Domain Name Resolution (DNS)

■VLAN Configuration

■DHCP Server Configuration

■Configure DHCP Relay

■Configure Network Address Translation (NAT)

Configure Address ARP is mainly used for resolution from IP address to Ethernet MAC address.

Resolution Protocol Normally, dynamic ARP is used to resolve the mapping relation from the IP address

(ARP)to the Ethernet MAC address. The resolution is completed automatically. At present, the number of dynamic ARP mapping table items supported by the 3Com Router series is up to 2000.

To configure ARP, carry out the following steps:

1Manually add/delete static ARP mapping table item

In some special cases, for example, the LAN gateway is assigned with a fixed IP address and bound to a specific network adapter, so that packets to this IP address can only go out via this gateway. While filtering illegal IP addresses if they are bound to a non-existing MAC address, it is necessary for user to configure mapping items in the static ARP table manually.

In the system view, configure the following commands.

Table 357 Define a static ARP mapping

Operation	Command
Manually add static ARP mapping table item	arp static ip-address
	mac-address
Manually delete static ARP mapping table item	undo arp static ip-address

2Manually add/delete dynamic ARP mapping table item In the system view, configure the following commands.

Table 358 Define a static ARP mapping

Operation	Command
Manually add dynamic ARP mapping table item	arp dynamic ip-address
	mac-address
Manually delete dynamic ARP mapping table	undo arp dynamic ip-address
item