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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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Authenticating Cisco Devices Against Active Directory

March 30, 2010

Many packets ago, in a network several hops away, I wrote about configuring Cisco devices against FreeRADIUS. Since then, I’ve received many requests for a similar post, but with Active Directory as the backend for authentication. I finally got around to knocking that out this past weekend. Because Windows is “graphical”, I felt it would be […]

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JunOS PSN-2010-01-623 Exploit

January 9, 2010

This code works for me, over and over again. Let me know if it works for you. Sorry about the shitty quality of the video, all I had handy was my Blackberry. UPDATE: I’ve posted a much better video of the PSN-2010-01-623 exploit in action. $ cat junos-crash.pl #!/usr/bin/perl my $host = shift; my $port […]

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Mitigate Latest Adobe Vulns With A GPO

December 16, 2009

Yesterday, December 15th, Adobe posted APSA09-07, “Security Advisory for Adobe Reader and Acrobat”, which is summarized as follows: Adobe has confirmed a critical vulnerability in Adobe Reader and Acrobat 9.2 and earlier versions that could cause a crash and potentially allow an attacker to take control of the affected system. There are reports that this […]

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Configuring Basic HSRP (Video)

September 19, 2009

Quick video demonstration of a basic HSRP configuration on a pair of routers:

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Configuring HDLC over MPLS (Video)

September 15, 2009

Lately I’ve become interested in MPLS and, unfortunately, have stopped studying what I should be studying and started playing around with MPLS instead. One thing that just fascinates me is AToM, or Any Transport over MPLS. From Cisco: “Any Transport over MPLS (AToM) is Cisco’s solution for transporting Layer 2 packets over an IP/MPLS backbone.” […]

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Getting BGP routes into dynamips (with video)

August 21, 2009

UPDATE: If you’re not interesting in doing this yourself and just want to see it in action, check out the video, “Dumping 265k BGP routes into dynamips”. When I went through these steps to document, I ended up with 298,870 prefixes in my dynamips router. When I did it the second time, to record the […]

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Video: Update ProCurve software via TFTP

August 17, 2009

Nothing earth-shattering here, but back in February, I posted “Upgrading ProCurve firmware via TFTP”. Since that time, I’ve started posting video demos of some of the things I write about, so I thought I’d make up a quick one for this task as well. I happen to have a 5412zl switch sitting here next to […]

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Using BGP communities to influence routing, part 2

August 10, 2009

I wanted to write a follow-up to a couple of earlier posts, Using BGP communities to influence routing and Allowing customers to manipulate routing using BGP communities to show some more ways we can use BGP communities to influence routing on the Internet. What we’re going to see today is very common in the real world, […]

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Configuring PPP over Frame-Relay

August 4, 2009

I made a quick video showing how to configure PPP over frame-relay. Well, actually I went a bit farther than that. Here’s the topology: First, we create two loopbacks on each router, then create a PPP connection between R1 and R3 and another between R1 and R4. Just for fun, we then throw OSPF into […]

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