Implementing port forwarding with IOS commands is similar to the commands used to configure static NAT. Port forwarding is essentially a static NAT translation with a specified TCP or UDP port number.
Figure 1 shows the static NAT command used to configure port forwarding using IOS.
Figure 2 shows an example of configuring port forwarding using IOS commands on router R2. 192.168.10.254 is the inside local IPv4 address of the web server listening on port 80. Users will access this internal web server using the global IP address 209.165.200.225, a globally unique public IPv4 address. In this case, it is the address of the Serial 0/1/0 interface of R2. The global port is configured as 8080. This will be the destination port used, along with the global IPv4 address of 209.165.200.225 to access the internal web server. Notice within the NAT configuration, the following command parameters:
local-ip = 192.168.10.254
local-port = 80
global-ip = 209.165.200.225
global-port = 8080
When a well-known port number is not being used, the client must specify the port number in the application.
Like other types of NAT, port forwarding requires the configuration of both the inside and outside NAT interfaces.
Similar to static NAT, the show ip nat translations command can be used to verify the port forwarding, as shown in Figure 3.
Implementing port forwarding with IOS commands is similar to the commands used to configure static NAT. Port forwarding is essentially a static NAT translation with a specified TCP or UDP port number.Figure 1 shows the static NAT command used to configure port forwarding using IOS.Figure 2 shows an example of configuring port forwarding using IOS commands on router R2. 192.168.10.254 is the inside local IPv4 address of the web server listening on port 80. Users will access this internal web server using the global IP address 209.165.200.225, a globally unique public IPv4 address. In this case, it is the address of the Serial 0/1/0 interface of R2. The global port is configured as 8080. This will be the destination port used, along with the global IPv4 address of 209.165.200.225 to access the internal web server. Notice within the NAT configuration, the following command parameters: local-ip = 192.168.10.254 local-port = 80 global-ip = 209.165.200.225 global-port = 8080When a well-known port number is not being used, the client must specify the port number in the application.Like other types of NAT, port forwarding requires the configuration of both the inside and outside NAT interfaces.Similar to static NAT, the show ip nat translations command can be used to verify the port forwarding, as shown in Figure 3.
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