Viper User
Manual (001-5008-000 Rev6)
Page
70
Figure 7.16 NAT on Viper: USER1 and USER2 considered private
1.1.46
NAT Port Forwarding
The NAT Port Forwarding table allows the user to specify a particular public port or range of
ports to be forwarded to the private network hidden by the Network Address Translation
Table. The user can also select between TCP and UDP protocols. Figure 7.17 shows the NAT
Eth IP subnet 192.168.205.0 will be hidden from the Public Network. Any TCP packets sent
to the Viper with port number 2000 will be redirected to the Private IP Address and Private
Port Number entered in the NAT Port Forwarding Table as shown in Figure 7.17.
Figure 7.17 NAT on Viper: Port 2000 is redirected to 192.168.205.125:23
Figure 7.18 shows the Private Network 192.168.205.0 being protected from the Public
Network 172.31.5.0. Viper (1) NAT Eth interface is enabled and Viper (2) NAT is disabled.
The Host 172.31.5.2 cannot send packets directly to the Private Network because it is