3Com 812 manual Address, Translation

Address Translation 6-9

The route will appear in the IP routing table. You can display all IP routes with the list ip routes command.

To delete an IP Static route, use the command:

	delete￿		ip route <ip network address>
		To add a Framed route that will be installed in the IP routing table when a
		connection is established, use the command:
	add framed_route vc <vc name>
			ip_route <ip network address>
			metric <metric>
	where gateway is the address of the remote router.
	The route will be removed from the routing table when the VC profile is disabled.
		To delete a Framed route so that it no longer will be installed in the routing
		table when the connection is established use the command:
	delete framed_route vc <vc name>
			ip_route <ip network address>
	Remember to disable and then re-enable the VC profile for the change to take
	effect.
IP Tools	The OfficeConnect Remote 812 CLI provides a standard set of IP utility programs
	including Ping, TELNET and RLOGIN.
Address	Public IP addresses are registered and can be used within a public network (e.g.,
Translation	the Internet). Due to the limitation of IP version 4 address space and the growth of
	the Internet, public addresses are becoming more scarce. One solution to this
	problem is to use private addresses on small LANs and to use Address Translation
	when accessing devices on the public network. Address Translation changes an IP
	frame’s private address to a public address at the gateway of a public network (i.e.
	the￿	OfficeConnect Remote 812 router).
	The router maintains a table of active port numbers in order to support
	simultaneous connections from different workstations on the LAN with one public
	IP address. The public address is the WAN interface address of the Remote Site
	profile, which can be statically configured or dyanmically learned (PPP).
Network Address	NAT is used when several privately addressed workstations share a single public
Translation (NAT)	address. NAT uses the TCP and UDP port numbers to map multiple private
	addresses to the single public address. For normal applications such as Web
	browsing and FTP transfers, NAT can be configured by just enabling the feature.
	When accesses are originated from the private addressed LAN, a mapping is
	established between the source port number and the source private address.
	When the response is received on the public addressed WAN port, the destination
	port is mapped back to the private address.