3Com 10014299 manual Configure Domain, Name Resolution, Display and Debug ARP

328CHAPTER 21: CONFIGURING IP APPLICATION

By default, the system executes static ARP mapping.

Static ARP mapping items are valid as long as the router works normally, but dynamic ARP mapping items are valid for only 20 minutes.

Display and Debug ARP	Table 359 Display and Debug ARP
	Operation	Command
	Display ARP mapping table	display arp [ verbose [
		ip-address ] ]
	Clear dynamic ARP information	reset arp-cache
	Turn on ARP commission information	debugging arp
Configure Domain	The TCP/IP Extranet not only provides an IP address to locate a device, but also
Name Resolution	designs a specific character-string host naming mechanism. This system uses a
(DNS)	layered naming mode, designating a meaningful name for a device on the
	Internet. There is a domain name resolution server on the network to associate the
	domain name to the corresponding IP address. As a result, the user can use the
	easy-to-remember, meaningful domain name instead of the complex IP address.
	Domain name resolution includes dynamic resolution and static resolution, which
	can supplement each other. In the resolution of a domain name, first use static
	resolution. If it fails, then use dynamic resolution. Some common domain names
	can be put into static domain name resolution table, which greatly increases the
	efficiency of domain name resolution.
	s domain name resolution requests. The server firstly resolves the domain name
	inside its own database, and submits it to superior domain name resolution server
	if the domain name is not within local domain, till the resolution is completed. The
	result can either be an IP address, or a non-existing domain name, which will be
	fed back to the user.
	Static resolution sets relationships between domain names and IP addresses
	manually. When a client requires an IP address corresponding to a domain name, it
	searches the static domain name resolution table for this designated domain name
	to get the corresponding IP address
Configure Static Domain	Static domain name resolution is conducted through static domain name
Name Resolution	resolution table, similar to the host file under Windows 95/98 operating system.
	The router can obtain the IP addresses of common domain names by checking this
	table. Meanwhile, it is easier for the user to remember host names than the highly
	abstract IP address to access the corresponding device.

Domain name resolution configuration include:

■ Add/delete static domain name resolution table item

1Add/delete static domain name resolution table item Perform the following task in system view.

Table 360 Add/delete static domain name resolution table item

Operation	Command
Add static domain name resolution table item	ip host domain-name ip-address