6-24 CHAPTER 6: M ANUAL SETUPConfiguring NAT Static and Dynamic MappingsIf you do not configure static or dynamic mappings for NAT (even if they have adefault PAT address), the following error message displays on the CLI consolewhen you enable the vc:When Network Address Translation (NAT, RFC 1631) is enabled, Static Addresses and/or Dynamicpool addresses must be configured. To configure static mappings for NAT, enter the following command:add nat static public_address private_address To configure dynamic mappings for NAT, enter the following command:add nat dynamic public_address countDo not use the public WAN port IP address of the OfficeConnect 812 as one ofthe NAT static or dynamic public IP addresses.Monitoring NAT The NAT configuration is displayed when viewing the remote site configurationusing the show vc command. The Network Address Translation field should indicate “RFC 1631 (NAT)”. The NAT Default Address field will contain the PAT default address if the optionis disabled, or a valid workstation IP address on the local LAN if it is enabled. The static and/or dynamic address definitions are appended to the display onlywhen configured. When the remote site is active, current port mappings and address mappingsare displayed with the following commands, respectively:list nat vc portlist nat vc addrSuper Network AddressTranslation (Super NAT)Typically, the user must decide when to use NAT and when to use PAT, andswitching between address translation modes must then be performed manually(by the user) as changing network conditions warrant. By contrast, with Super NATenabled on the OCR 812, the system (not the user) automatically determineswhen it is best to use NAT, and conversely, when it is best to use PAT. Super NATmakes optimal use of available IP Addresses by enabling the system toautomatically switch between PAT and NAT when multiple public addresses areassigned 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 nomappings are configured, the address translation mode will automatically be setto PAT.
