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99 Problems But A Switch Ain’t One

November 2, 2012

Tom Hollingsworth laid down a nice little rap in the Day 1 Wrap-Up Video at Network Field Day 4, but it looks like he may have some competition — from inside Cisco, no less! From the video description: The group of new hires at cisco were told to make a parody music video for fun. […]

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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 Nexus 3548 Switch: 190 nanosecond latency

September 19, 2012

Hot on the heels of the new Arista Networks 7150S series top-of-rack switches that offer latencies as low as 350 nanoseconds, Cisco came out with an announcement of their own, shattering the land speed record in the process. The newest addition to the Nexus line of high-performance datacenter switches, the Cisco Nexus 3548 is a […]

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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 and IOUlive86 now available on Github

December 5, 2011
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From the Cisco IOU FAQ page: Cisco IOS on UNIX (IOU) is a fully working version of IOS that runs as a user mode UNIX (Solaris) process. IOU is built as a native Solaris image and run just like any other program. IOU supports all platform independent protocols and features. Many of you are already […]

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IOU License Generator on Github

November 1, 2011
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NOTE: For clarification, I did not write the IOU License Generator discussed in this article. It was written by someone else; I simply wrote this article about it. If you’re in need of a license key for Cisco IOU, you’re in luck. A new license generator, iougen, has popped up on Github in the last […]

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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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Why Is Cisco Crawling My Website?

August 24, 2011

A while back, I noticed my website was being hit by a new crawler at IP address 72.163.33.126: $ host 72.163.33.126 126.33.163.72.in-addr.arpa domain name pointer srch-prod-170.cisco.com. Cisco has apparently decided to keep an eye on me. Okay, whatever, that’s fine, but since you never know what Cisco’s up to, I decided to keep my eye […]

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