In a scenario where a DST-NAT rule sends HTTP traffic to an internal server, how would you specify a firewall rule to block communication from a specific external address?

To block communication from a specific external address in the context of a DST-NAT rule that forwards HTTP traffic to an internal server, it’s essential to correctly define the source and destination addresses in the firewall rule.

The scenario involves incoming HTTP traffic from an external source, which is being directed to an internal server via a DST-NAT rule. To effectively block that traffic from a particular external address, the source address in the firewall rule should match the address you want to block. In this case, if the external address you wish to block is 159.148.20.30, the firewall rule must specify this address as the source.

The destination address in the rule should correspond to the internal server’s address. If the internal server’s address is 80.232.50.100, the rule correctly blocking traffic would have 159.148.20.30 as the source address and 80.232.50.100 as the destination. This would effectively prevent traffic from the specified external address from reaching the internal server, thus achieving the desired security objective.

In summary, correctly identifying the source of the unwanted traffic (159.148.20.30) and specifying the corresponding destination IP (80.232.50.100) ensures