Connect Firewall to FMC Through NAT Device

Normally connecting a firewall to a Firepower Management Center server is a short, simple process. This is because a lot of use cases have the FMC and the FTD firewall on the same network....

Firepower FTD – No Gateway for Management Interface

I was recently working on a Firepower 5506-X that I pulled off the shelf that had had the configuration wizard ran on it already. The management interface had a configuration but had no gateway...
pmtu-d packet

PMTU-D Packet Greater Than Effective MTU

Nothing special about this post, but I ran into an issue today and wanted to pass along the fix. I've noticed some of my posts that revolve around bug fixes are the most popular,...

Basic DHCP Snooping Lab

One very easy thing that I wanted to review was DHCP snooping. There isn't much to it, but it's a good thing to review. Take a look at the lab topology. SW3 is the...

Nat-Traversal (Nat-T) Clarification

There was a recent lab I was working through where Nat-T was the main focus. Basically there was a firewall behind the internet router. It looked a little something like this, but sub our...
Remote-Firepower-Firewall-Example-Topology

Add Remote Firepower Firewall to Firepower Management Center

This guide is something that I have seen requests for in multiple places including the Cisco supportforums. I recently had to complete this process for some new Cisco Firepower FTD firewalls so I am...

ERROR: TRACER: NP failed tracing packet

I recently implemented a couple of Cisco Firepower firewalls and have been using the packet-tracer feature to determine which NAT rules were being used for certain traffic for instance. Then, after troubleshooting an issue...

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