Always Networks Blog - GNS3

MTU / Fragmentation / ACL Tests….Part 2

Now that ICMP traffic is fragmenting across the network, it's time to change and start using TCP traffic.

This is a follow on from MTU / Fragmentation / ACL Tests….Part 1 and I am aiming to find out what happens to fragmented packets when matched to static extended access lists.

I'm going to use a program called Ostinato for this. It's a freeware tool for generating …

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MTU / Fragmentation / ACL Tests....Part 1

There was a throwaway line in a book I was reading (the CCNA: Security Official Certification Guide), that said that a disadvantage of ACL's is:

Does not filter fragmented packets with the same accuracy as non fragmented packets.

I have no idea why this is true, and after a post on techexams.net, I decided to just set up a lab and have a go …

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Cisco Configuration Professional (CCP) on Windows 7 with GNS3

Sun 14 July 2013

I've just set up CCP on Windows 7, connecting it to a 7200 series router in GNS3. It's a simple enough process, but there were a few "features" along the way.

I thought I'd share my experiences and maybe help someone out along the way.

I started with downloading CCP. It's freely available from the Cisco website, as long as you have a valid Cisco …

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AAA Server with freeradius, Ubuntu, Virtualbox and GNS3

I've spent a fair few hours now trying to get a AAA Radius server working with GNS3, so I thought I'd share my experiences.

Just so you know, I'm using Windows 7.

First off, I installed VirtualBox. You can get this here: Oracle VM VirtualBox

Next, I downloaded Ubuntu Desktop. You can get this here: Download Ubuntu

I created a new VM, with 512MB RAM …

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