3Com OfficeConnect Remote 812 manual Configuring NAT Static and Dynamic Mappings, Manual Setup

The Network Address Translation field should indicate “RFC 1631 (NAT)”.

The NAT Default Address field will contain the PAT default address if the option is disabled, or a valid workstation IP address on the local LAN if it is enabled.

6-24CHAPTER 6: MANUAL SETUP

Configuring NAT Static and Dynamic Mappings

If you do not configure static or dynamic mappings for NAT (even if they have a default PAT address), the following error message displays on the CLI console when you enable the vc:

When Network Address Translation (NAT, RFC 1631) is enabled, Static Addresses and/or Dynamic pool addresses must be configured.

￿	To configure static mappings for NAT, enter the following command:
	add nat static <vc name> public_address <ip address> private_address
	<ip address>
￿	To configure dynamic mappings for NAT, enter the following command:
	add nat dynamic <vc name> public_address <starting ip address> count
	<size of address pool>

Do not use the public WAN port IP address of the OfficeConnect 812 as one of the NAT static or dynamic public IP addresses.

Monitoring NAT The NAT configuration is displayed when viewing the remote site configuration using the show vc command.

The static and/or dynamic address definitions are appended to the display only

￿when configured.

When the remote site is active, current port mappings and address mappings are displayed with the following commands, respectively:

list nat vc <vc name> port list nat vc <vc name> addr

Super Network Address Typically, the user must decide when to use NAT and when to use PAT, and Translation (Super NAT) switching between address translation modes must then be performed manually

(by the user) as changing network conditions warrant. By contrast, with Super NAT enabled on the OCR 812, the system (not the user) automatically determines when it is best to use NAT, and conversely, when it is best to use PAT. Super NAT makes optimal use of available IP Addresses by enabling the system to automatically switch between PAT and NAT when multiple public addresses are assigned to the site.

Configuring Super NAT You can configure NAT, PAT, or both NAT and PAT.

To use Super NAT, the system must first be configured to use both NAT and PAT, and Super NAT must then be enabled.

The user is not required to add static or dynamic mappings for Super NAT. If no mappings are configured, the address translation mode will automatically be set to PAT.