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58 SALES: 0870 90 10 750 Dual Trunk E1 Router User’s Guide
Dual Trunk E1 Router
• Static NAT - To map a unregistered IP address to a registered IP address. This is useful to enable
outside hosts to access an internal IP host of server.
• Dynamic NAT - To share dynamically a range of global addresses among internal hosts to access
the internet. Translation occurs when traffic takes place.
• Overloading - If the number of global addresses available is less than number of hosts which
need to access internet at the same time, then the port field also can be used for translation.
Unregistered IP addresses are mapped to one or many registered IP addresses.
NAT Configuration menus
NAT is configurable through the TUI menu $J accessible direcly or remotely via Telnet.
Table 6-5 NAT configuration menus
Menu Description
Menu-$JA Global Map table To configure the global IP address ranges to allocate through NAT.
Select Add command Add the global IP addresses to NAT.
Menu-$JB NAT static table To configure the one-to-one mapping of global IP addresses to local IP
addresses.
Menu-$C-Local address table To configure the networks that require NAT translation. If the table is empty
no NAT translation will take place.
NAT will translate if the packet source or destination IP address is included
in the Local table.
NAT will not translate if both the packet source AND the destination IP
addresses are included in the local table. This is useful for network scenarios
where filtering NAT, based on source and destination addres, is required.
Menu-$JE NAT Interface
configuration
To enable or disable NAT and NAPT per WAN interface.
Menu-$JF NAT Dynamic entries To verify dynamic operations. You can view the dynamic alloction of global
IP addresses to local host as traffic takes place.