Garmin HM210DP/DI - Manual (Page 74)

Configuring NAT
66 EN/LZT 108 6492 R2 - October 2003
to a corresponding address in a range of global addresses (which
you specify in the next step).
7. In the “Global Address From/To:” fields, type the starting and
ending IP address that identify the pool of public IP addresses to be
translated to your private IP addresses. Or, type the same IP
address in both fields (if you also specified a single address in the
previous step).
8. Enter a “Destination Address From/To:” ….
9. Enter a starting and ending port number in the “Destination Port
From/To:” fields if incoming traffic destined for these port types
should be redirected to the address(es) ….
10. When you have completed entering all information, click the Submit
button. A page appears to confirm the changes.
11. Click Close to return to the NAT Configuration page. The new rule
should no be displayed in the NAT Rule table.
12. On the NAT Configuration page, ensure that the Enable radio
button is selected and then click the Submit button. A page appears
to confirm your changes.
13. Select Admin > Commit & Reboot and click the Commit button to
save your changes to permanent storage.
8.5.5 The BIMAP Rule
Unlike the other NAT flavors, the BIMAP flavor performs address
translation in both the outgoing and incoming directions.
In the incoming direction, when the specified interface receives a packet
destined to your public IP address, this address is translated to the private
IP address of a computer on your LAN.
In the outgoing direction, the private source IP address in a data packet is
translated to the LAN’s public IP address.
BIMAP rules can be used to provide external access to a LAN device. They
do not provide the same level of security as RDR rules, because RDR rules
also reroute incoming packets based on the port ID. BIMAP rules do not
account for the port number, and therefore allow external access
regardless of the destination port type specified in the incoming packet.
To create a BIMAP rule, proceed as follows: