Monthly Archives: October 2013

Cisco ASA IPSec Pre Shared Key Recovery

The Cisco ASA firewall is one of the most common firewalls I have encountered while both working in the corporate IT world as well as in the consulting industry with small to medium clients. Most administrators enjoy working with it as it has both a fairly intuitive interface in the form of the ASDM and a powerful CLI as well. One simple but common complaint, however, is that pre shared keys are difficult to recover from the units when working with IPsec tunnels. The solution is quite simple yet often elusive. Continue reading

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Cisco ASA Password Recovery

When inheriting used and abused customer networks it becomes necessary to reset passwords on devices the hard way from time to time. Fortunately with the Cisco ASA it’s still not all that complicated. You will see that with each step I included examples of the commands and the output along the way as well. Continue reading

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Route Summarization Basics

With the advent of Variable Length Subnet Masks (VLMS) and classless networking keeping track of where exactly IP address space physically resides on the network has become a bit more complicated simply because we have the options and the flexibility to break networks into smaller subnets. Chances are you are probably at least somewhat familiar with subnetting but may not be as familiar with route summarization. Summarization is basically reversing the same actions of subnetting. This can also be called supernetting by the way. Really, in today’s world you can basically manipulate the subnet mask in any way you like … Continue reading

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