How to Create NAT Tables (Translation Maps)

NAT Tables are an expanded type of source NAT for a network or IP address range. The NAT Tables connection object rewrites the source IP address to a source NAT IP address range. To rewrite both the destination and the source address of the connection, you can choose to use a NAT Table connection object with a MAP access rule. You can enter multiple rewriting maps, which are processed from top to bottom. The first matching rewrite map is used.

Create a NAT Table Connection Object

1. Go to CONFIGURATION > Configuration Tree > Box > Assigned Services > Firewall > Forwarding Rules.
2. From the left menu, click Connections.
3. Click Lock.
4. Right-click the table and select  New > NAT Table.

5. Enter a Name.

6. (optional) Select Use Same Port to disable port address translation.
7. (optional) Enter the connection Timeout in seconds. Default: 30 seconds
8. Click + to add an entry to the NAT Table list:
   
   • Original Network – Enter the source IP range or network.
     
   • Translated Base IP – Enter the network that you want the source IP address or network to be rewritten to.
   • Proxy ARP – Select the check box unless the destination network is connected by a layer 2 bridge to the source network.
     
   
9. (optional) Use the up and down arrows to sort the entries in the NAT Table.
10. Click OK.
11. Click Send Changes and Activate.

Apply the NAT Table to an Access Rule

To apply a NAT Table object to an access rule, select the object from the Connection Method list in the access rule settings.