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Chapter 6 Traffic Policy
104
know DNS name of your host, use the Resolve button to translate the DNS name to IP
address.
Warning: The IP address must be assigned to an interface (bound by TCP/IP stack) of
the WinRoute host!
Destination address translation (also called port mapping) is used to allow access to
services hosted behind the firewall. All incoming packets that meet defined rules are
re-directed to a defined host (destination address is changed). This actually “moves” to
the outbound interface of the WinRoute host (i.e. IP address it is mapped from). From
the client’s point of view, the service is running on the IP address of the Firewall.
Options for destination NAT (port mapping):
Figure 6.20 Traffic rule — destination address translation
• No Translation — destination address will not be modified.
• Translate to — IP address that will substitute the packet’s destination address. This
address also represents the IP address of the host on which the service is actually
running.
The Translate to entry can be also specified by DNS name of the destination computer.
In such cases WinRoute finds a corresponding IP address using a DNS query.
Warning: We recommend you not to use names of computers which are not recorded
in the local DNS since rule is not applied until a corresponding IP address is found.
This might cause temporary malfunction of the mapped service.
• Translate port to — during the process of IP translation you can also substitute the
port of the appropriate service. This means that the service can run at a port that is
different from the port from which it is mapped.
Note: This option cannot be used unless only one service is defined in the Service
entry within the appropriate traffic rule and this service uses only one port or port
range.
The following columns are hidden by the default settings of the Traffic Policy dialog: