![]() 4, one of the first things network engineers noticed was that the NAT configuration on the new code had changed drastically. Destination NAT traffic from external IP address (198. What’s happening here is something called “twice NAT” and is used to identify both the source and destination address in a single rule. Pay close attention to the SOURCE and DESTINATION used here. This means for example that a routing device can receive a packet and look at its source IP address (instead of destination) and route the packet according to its PBR policy. Confirm the ACL Manager NOTE: With the Cisco ASA 5505 there are no fixup protocols to configure however, common issues noted with many Cisco ASA models relate to their use of fixup protocols. You should only specify both the source and destination ports if your application uses a fixed source port (such as some DNS servers) but fixed source ports are rare. ![]() ![]() The source configuration also has a firewall rule that matches the static NAT rule and its destination is a member of the group Group_Destination. I cannot expose the ASA's transit network to the internal routing tables behind each ASA, so therefore need to NAT into and out of the ASA. When referring to the packet flow through any device, it can be easily simplified by looking at the task in terms of these two interfaces.
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