SMC Networks SMC7204BRA manual Bimap rule Performing two-way translations

Configuring Network Address Translation

6.In the [Destination Address From:] and [Destination Address To:] fields, specify a destination address (or range) if you want this rule to apply only to outbound traffic to the address (or range).

If you enter only the network ID portion of the destination address, then the rule will apply to outbound traffic to all computers on network.

7.In the [Destination Port From:] field, type a port ID number

if you want the rule to apply only to outbound traffic to servers of this type.

8.You can specify a range using the From/To fields if you want the rule to apply to a range of port types, or enter the same port number in both fields. See step 6 for creating an RDR Rule on page 71 for an explanation of port IDs.

9.Follow steps 8-12 under The NAPT Rule on page 68 to submit your changes.

The Bimap rule: Performing two-way translations

Unlike the other NAT flavors, the Bimap flavor performs address translations in both the outgoing and incoming directions.

In the incoming direction, when the specified ADSL Barricade interface receives a packet with your public IP address as the destination address, this address is translated to the private IP address of a computer on your LAN. To the external computer, it appears as if the access is being made to the public IP address, when, in fact, it is communicating with a LAN computer.

In the outgoing direction, the private source IP address in a data packet is translated to the LAN's public IP address. To the rest of the Internet, it appears as if the data packet originated from the public IP address.

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