User manual

Firewall
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This rule is applied to packets that match the critera described by the next four fields.
Destination Address The destination address of the request, this is the
address that is altered
Protocol The protocol of the packet
Ports The destination service port or ports of the request,
note that many public ports may be forwarded to a
single internal port
The next two fields describe how matching packets should be altered.
To Destination Address The address to replace the Destination Address
(this is typically the private address of a host on the
LAN)
Optional To Ports The port to replace Ports, if you leave this blank the
port remains unchanged, otherwise enter the port
on the host at To Destination Address to service
the request
Click Advanced if you want to specify the incoming interface and source address,
otherwise this rule is applied to all WAN interfaces and all source addresses are
matched.
Incoming Interface The interface that receives the request
Source Address The address from which the request originated (for
port forwarding you may specify this to restrict the
internal service to be only accessible from a specific
remote location)
Note
When adding a rule, you may either use Predefined addresses or services that have
been added under Definitions, or click New to manually enter an address or service.
Port forwarding to an internal mail server
The following is an example of using port forwarding to allow hosts on the Internet to
send and receive mail using a mail server on your LAN.