Recent posts

CBAC in Action, Part 1

April 18, 2010 | 3 minute read

In a previous post I talked about CBAC and a few of the ways in which it, in conjunction with NBAR can be used to secure your network. Today I will create a lab to show you how to put it to good use. In this lab we have four routers, R1, R2, R3 and R4 (very original I know). Here are there designations: R1 = Local LAN - Your network R2 = ...

CBAC Firewall

April 17, 2010 | 1 minute read

In my previous post I mentioned the Cisco IOS firewall feature known as CBAC (Context-Based Access Control). Today I will describe it in more detail and explain how you can use it to increase the security of your network. As you may know, a firewall is used to protect your network from the outside world and all of the nasty hackers out there. W...

NBAR and its Many Uses

April 16, 2010 | 1 minute read

NBAR, also known as Network Based Application Recognition is an invaluable tool that many people do not know exists or simply just don’t use it enough. As the name suggests, NBAR reads packets that flow through a router and “recognises” the types of applications that are sending the packets. Examples of applications that can be recognised inclu...

GNS3 + Real Cisco Gear

April 14, 2010 | 2 minute read

For those of you who have never heard of GNS3 before, you are in for a treat! What it does is allow you to run multiple routers on your computer in a virtualised environment, and, because it uses real Cisco IOSes you are not limited to a short group of commands as you are when using simulators, you actually have access to the entire command tre...

Welcome!

April 13, 2010 | 1 minute read

Hello and welcome to my blog. I know what you are thinking, “not another Cisco Blog!”, but this one will be different, I promise :) The point of this blog is to patch up the holes that other blogs/websites leave in the information that they provide. While researching topics in the past, I have found on more than a few occasions that some sites...