Category Archives: Cisco

GNS3 and ASA

Recently, I have encountered the need to acquaint myself with the Security world of Cisco and due to an insufficient amount of funds to buy myself a couple of ASAs, I am using simulated ASAs using GNS3. If you have never used GNS3 before, it is an absolutely must-need for any networking student or professional. You can download it here

So, to begin with, you will need to obtain the initrd and kernel files for the ASA ISO (which can be found using your Google skills). When booted, you are more likely than not, going to encounter a nice little issue whereby if you assign an IP address to an interface and issue a “no shut” command, the IP address fails to register when you enter the “show int ip brief” command.

Now, this might be where I show my inexperience with ASAs, and it actually took me a very long time looking on forums for the answer, but the answer was indeed very simple. If you enter the interface configuration mode and enter “nameif xxxx” the interface will auto-magically come online!

I will add screenshots later to clarify this but I hope this helps you out!




CCNA – finally!

So, this week I retook my CCNA exam and passed with flying colours. I narrowly missed out on passing the old 640-802 curriculum on the final day I could take it by 1% due to a mis-configured ACL sim. Monday this week, I retook the shiny 200-120 CCNA exam and passed with 93.1% even with that pesky ACL sim in there to really throw me off. Needless to say, I was absolutely ecstatic to finally be on the Cisco Certified ladder.

I am now in the process of getting my CCNA Voice which is a requirement for my job and I have started to build a little Voice lab at home. The lab consists of a Cisco 2800 Router with IPVoice 12.3 IOS loaded and a Cisco 3500XL Switch with inline power. Running off the switch I have two Cisco 7921 IP phones and a bog standard ATA phone. The idea is to firstly fully configure CME and then do various practical configurations such as Hunt Pilots and Call Pickup Groups.

I shall detail my progress here 🙂