In the NAT port forwarding configuration for SSH, which destination IP is used?

In the NAT port forwarding configuration for SSH, which destination IP is used?

• A. 172.16.1.5
• B. 172.16.1.100
• C. 172.16.0.6
• D. 172.16.1.6

Answer: (D)

Port forwarding with NAT routes an external connection to a specific internal host by using the private destination IP in the rule. For SSH, the traffic that arrives on the router’s public IP and port 22 is forwarded to the machine inside the network that runs the SSH daemon. The internal address used as that destination must be the SSH server’s private IP. In this scenario, the SSH server is at 172.16.1.6, so that is the destination IP the NAT rule should point to. The other internal addresses would forward to different devices or services, so they wouldn’t receive the SSH traffic.

Port forwarding with NAT routes an external connection to a specific internal host by using the private destination IP in the rule. For SSH, the traffic that arrives on the router’s public IP and port 22 is forwarded to the machine inside the network that runs the SSH daemon. The internal address used as that destination must be the SSH server’s private IP. In this scenario, the SSH server is at 172.16.1.6, so that is the destination IP the NAT rule should point to. The other internal addresses would forward to different devices or services, so they wouldn’t receive the SSH traffic.