Secure Network Administrationadvanced
When configuring a Source NAT rule on a firewall for outbound Internet access, what are the distinct roles of the Original Packet and Translated Packet settings?
Answer
Original Packet settings define the traffic matching criteria, while Translated Packet settings define how the source IP address and port are altered.
Explanation
### What a good answer covers
- The rule is an IPv4 NAT policy matching Internal-to-Internet traffic.
- It selects `ethernet1/1` as the destination interface and uses the lab's specified broad matching values.
- Dynamic IP and Port is the selected source translation type.
- Interface Address selects the outbound interface address as the translated source.
- Saving and committing the configuration precede the Internet-access test.
### The concept
A NAT rule has conditions for the original packet and a translation for the matching packet. In this case, the original conditions identify outbound Internal traffic, and the translated-packet settings change the source address. The rule does not replace the security policy, which separately permits the traffic.
### Terms
- **IPv4**: Internet Protocol version 4, the packet-address format selected in the lab.
- **Dynamic IP and Port**: The source translation type selected by the lab.
- **Interface Address**: The address assigned to the selected firewall interface.
### Remember
State both what traffic matches and what address the firewall changes.
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