Always Networks Blog

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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CCNP, I think so!

Fri 28 June 2013

Well that's that! Passed my TSHOOT this morning so I'm now a CCNP!

Happy as larry - whoever larry is.

It's been a lot of hard work, long evenings and expensive electricity bills, but I'm there.

My summarisation on my experience -

ROUTE: Lab lab lab. There's a lot of material to cover in this topic, and a lot of practical can be done to practice. I …

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ROMMON tftpdnld is my friend

After watching my router go around and around in circles, continually failing to boot, I decided enough was enough. Time to break out ROMMON tftpdnld.

I've used ROMMON before to download a TFTP image, but it's never something I remember off the top of my head. In the interests of this being my own personal wiki, and so it's here for anyone else it benefits …

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The Importance of Cisco Feature Navigator

The other day I was implementing BGP when I was presented, much to my horror, with a message stating that BGP was not available in this image.

Strange, because I had two identical routers, both the same model, and it worked fine on the other one! When I looked, one had and advancedIP image, and one had a baseIP image.

No problem, I thought. Set …

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