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...

Cisco NX-OS TACACS+ Setup Guide

Quick post here, nothing much to it. This will be a straight forward guide to NX-OS TACACS+ Setup. TACACS+ was developed by Cisco as an extension to TACACS that fully encrypts each packet. This...

Cisco Router IPSec VPN Tunnel Lab (with Video)

This post will cover the creation of an IPSec tunnel between two Cisco routers. If you've ever done one of these on an ASA firewall for instance, you will notice right off the bat...

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....

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...

Cisco Firepower Sees new Resiliency with Updates

If you are in the IT security industry, you know the history of Cisco and their Firepower line of firewalls. In the beginning, Cisco was one of the first to the Next-Gen Firewall market....