B+B SMARTWORK SPECTRE V3, Configuration Manual

Page: 60 / 136

4. CONFIGURATION
4.9 NAT Configuration
To configure the address translation function, open the NAT Configuration page, click on
NAT
in the
Configuration
section of the main menu. The router actually uses Port Address
Translation (PAT), which is a method of mapping a TCP/UDP port to another TCP/UDP port.
The router modifies the information in the packet header as the packets traverse a router. This
configuration form allows you to specify up to 16 PAT rules.
Item Description
Public Port Public port
Private Port Private port
Type Protocol type
Server IP address IP address where the router forwards incoming data.
Table 33: NAT Configuration
If you require more than sixteen NAT rules, then insert the remaining rules into the start
up script. The Startup Script dialog is located in the Configuration section of the main menu.
When creating your rules in the start up script, use the following format:
iptables -t nat -A napt -p tcp --dport [PORT\_PUBLIC] -j DNAT --to-destination
[IPADDR]:[PORT1\_PRIVATE]
Enter the IP address
[IPADDR]
, the public ports numbers
[PORT_PUBLIC]
, and private
[PORT_PRIVATE]
in square bracket.
You use the following parameters to set the routing of incoming data from the PPP to a
connected computer.
Item Description
Send all remaining incoming
packets to default server Activates/deactivates forwarding unmatched incoming
packets to the default server. The prerequisite for the
function is that you specify a default server in the
Default
Server IP Address field. The router can forward incom-
ing data from a GPRS to a computer with the assigned
IP address.
Default Server IP Address Specified the IP address for the default server.
Table 34: Configuration of send all incoming packets
51