Configuration of N:N mapping succeeds with only few information. Since a LAN can be coupled with several other networks via N:N, different destinations can have also different address translations for a source IP range. The NAT table can contain 64 entries at maximum, including the following information:
- Index: Unambiguous index of the entry.
- Source address: IP address of the workstation or network that should get an alternative IP address.
- Source mask: Netmask of source range.
- Remote station: Name of the remote station over that the remote network is reachable.
- New network address: IP address or address range that should be used for the translation.
For the new network address, the same netmask will be used as the source address already uses. For assignment of source and mapping addresses the following hints apply:
- Source and mapping can be assigned arbitrarily for the translation of single addresses. Thus, for example, it is possible to assign the mapping address 192.168.1.88 to a LAN server with the IP address 10.1.1.99.
- For translation of entire address ranges, the station-related part of the IP address will be taken directly, only appended to the network-related part of the mapping address. Therefore, in an assignment of 10.0.0.0/255.255.255.0 to 192.168.1.0, a server of the LAN with IP address 10.1.1.99 will get assigned the mapping address 192.168.1.99.
Note: The address range for translation must be at minimum as large as the source
address range.
Note: Please notice that the N:N mapping functions are only effective
when the firewall has been activated.