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Why Best Practices Are Important (or: How I Pwn’d The Shit Out Of My ISP)

September 28, 2012
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Note: The events described herein took place many, many years ago (the statute of limitations has long since expired!), but the moral of the story remains the same. This topic came up on IRC a few nights ago and since a) several were interested in the story and b) I’m heading out to DerbyCon shortly, […]

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Cisco ASA: “read-only file system”

March 21, 2012
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Recently, while upgrading a Cisco ASA that belongs to a customer and hasn’t been touched in a long time, the following took place: ciscoasa# copy tftp flash Address or name of remote host []? 10.10.10.42 Source filename []? asa842-k8.bin Destination filename [asa842-k8.bin]? Accessing tftp://10.10.10.42/asa842-k8.bin…!!!!!!!!!!!!!!!!!!!!!!! … Writing file disk0:/asa842-k8.bin… %Error opening disk0:/asa842-k8.bin (Read-only file system) ciscoasa# […]

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How To Upgrade Cisco ASA Software And ASDM

February 15, 2012

After writing about how to upgrade a Cisco ASA license, I received a few messages asking about upgrading the Cisco ASA software. Fortunately, just like upgrading IOS on a Cisco router, it’s an easy, straightforward process that you can knock out in a few minutes. In this walkthrough, we’ll be upgrading the the ASA software […]

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How to Upgrade the License on a Cisco ASA

December 16, 2011
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The different licensing “levels” available on the Cisco Adaptive Security Appliances allow an organization to buy only what they need while retaining the option to upgrade in the future, if necessary. For example, a small business with 15 employees may start out with a Cisco ASA 5505 with a 25-user (or, more correctly, 25-host) license. […]

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iou2net.pl, an IOUlive replacement

September 22, 2011

In the months since Cisco IOU leaked out, many people have began using it for study purposes instead of or in addition to dynamips. One advantage that dynamips has over IOU is the ability to communicate with a physical network which comes in handy sometimes, like when you want to do pointless things like dumping […]

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Announcing Free CCNA Labs (and Giveaway)

September 21, 2011

Those of you studying for the CCIE lab exam have some great resources at your disposal. In particular, there are some excellent lab workbooks with “hands on” exercises to work through to help prepare you for that $1500 lunch with Cisco. One thing that really annoyed me as I was working towards the CCNP certification […]

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How To Make Your Routers Reload Faster

July 22, 2011

When doing labs, one thing that really annoyed me was how long it took some of my routers to reload. After doing a lab exercise, I would always erase the configuration and reload in order to start from a “blank” configuration. I just recently discovered a way to speed up this process. It’s pretty basic […]

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Manage Your WordPress Theme Using Git

July 20, 2011

When I first started this website, my purpose was to simply have a place I could post things that were useful to me and that I could access from anywhere. It didn’t take me long to realize that the things I was documenting were also helpful to lots of other people. This is one of […]

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HP: Changing the rules of networking

February 23, 2011

Yesterday, after having received zero help from the “HP Networking Global Competency Center” over the last three weeks, I managed to discover the cause of an issue I’ve been dealing with. I previously wrote “When isn’t a loopback always reachable?”, describing the issue. Since that time, I’ve loaded a “Premium License” (which costs $2,325.99 from […]

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Using etckeeper with git on Ubuntu

February 18, 2011

Though I think we would all agree that it’s important, the unfortunate fact is that myself and other members of my “team” don’t necessarily document things as well as we always should. I’m fairly certain that a lot of knowledge would be gone forever if one of us fell asleep in a bathtub and drown […]

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