TW-H6W1IR ISDN Remote Router
84 Configuration and
Management
CUSeeMe and Diablo) require specific port number translations,
access to a range of port numbers, or no port number translation at all.
The router can be configured for these types of applications using the
Configure NAPT for Special Ap[plication]s submenu which is
further described below.
As with NAT, defining static NAPT entries negates the security inherent
in the NAPT process. However, only the specific port on the computer
associated with the Static NAPT entry is accessible to users outside
your network. In any case, whenever Static assignments are used, we
highly recommend using alternative security measures such as filters
and/or security features in the application software.
Setting Local IP Addresses
When implementing NAT and thus creating a private network that is
isolated from the Internet, you can assign any IP addresses to host
computers without problems. However, the Internet Assigned Numbers
Authority (IANA) has reserved the following three blocks of IP
Addresses specifically for private networks:
Class Beginning Address Ending Address
A 10.0.0.0 10.255.255.255
B 172.16.0.0 172.31.255.255
C 192.168.0.0 192.168.255.255
It is recommended that you choose local IP addresses for use with
NAT from the private network IP addresses in the above list. For more
information on address assignment, refer to RFC 1597, Address
Allocation for Private Internets and RFC 1466, Guidelines for
Management of IP Address Space.
