The Codes of ICMP

In today’s post I wanted to talk about the widely used Ping command. Which is one of the best methods (I think) to begin network troubleshooting. When part of the network goes down it is sometimes hard to figure out why? When you issue the ping command or the extended ping command in a Cisco router several ICMP codes can come up on the router. Let’s discuss them! Continue reading “The Codes of ICMP”

Advertisements

Understanding CBAC

Although using hardware firewalls are an excellent step forward when securing your network. They can cost money and are not cheap to set up and configure. Using CBAC is built-into the Cisco IOS router and helps filter those unwanted protocols that are in your network. When setting up routers as firewalls you have some choices like using CBAC the “Classic” firewall, or zone based policy (ZBF). Today we will talk about CBAC and how to understand the core components of what make CBAC possible. Continue reading “Understanding CBAC”