FMC – An internal error is preventing the system from validating this policy.

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Have you ever been working on an access policy in Cisco Firepower Management Center and then seen the following error pop up when you opened or saved a policy: An internal error is preventing the...

Basic Cisco Dot1X Setup Guide for Wired Authentication

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If there is one thing we all know when it comes to network security it is that we need to know just who and what are on our networks. That's a very broad and...

ERROR: TRACER: NP failed tracing packet

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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...

Cisco ASA 9.4 – Policy Based Routing

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It has finally happened: policy based routing is available for the Cisco ASA platform. This comes about from the new version 9.4 of the ASA software. While a lot of the time policy based...

Port Forwarding for Palo Alto Firewalls

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I recently purchased a Palo Alto PA-220 for home use, labbing, and studying as well. Setup went pretty straight forward with a bit of trial and error, but then I started going a little...

Asymmetric NAT rules matched for forward and reverse flows

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I was configuring a basic VPN configuration on my home Cisco ASA firewall so I could monitor a few things locally on my network while I was out with my iPhone. Being a Friday...
firepower 1000 series firewalls

The Cisco Firepower Firewall Everyone is Waiting For

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If you follow Cisco networking and their security products, then you are no stranger to the launch of the Firepower and FTD series of firewalls. It offered products that ranged from small branch-office firewalls...