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It's not the Network! Ok, maybe it's the network...

Jason Rahm

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Top Stories by Jason Rahm

Welcome back for another episode of the ABC's of NSM.  What's NSM you say?  We'll go with Network and System Management, but you could throw Security in there as well.  We'll work our way through the alphabet over  the next several weeks looking at  tools and concepts along the way for all the administrators out there.   By the way, you can thank Joe for the format & Don for the title  (I  couldn't for the life of me come up with one.) Today's letter U is for Umbraco, an open-source .NET based content management system.  There are no shortages of CMS platforms. However, thanks to the excellent people behind the CMS Matrix, the heavy lifting is already done for you.  Particularly useful in the matrix is the incredibly detailed feature listings for each of the CMS packages.  This is especially helpful when comparing two packages side by side.  But I digress...back to U... (more)

The Wait Is Over: Edit Your iRules on Linux!

DevCentral has many rock star contributors.  Most are not affiliated officially with F5 Networks, or DevCentral for that matter, but there are several F5ers who believe in the community, and really believe in the F5 story.  One of those F5ers is Matt Cauthorn, or as you know him in the community, L4L7.  You may recognize Matt as the author of pyControl.  Well, not only did he provide this entrance to a better iControl experience, he has also delivered in a major way with his Vim plugin for editing iRules (utilizing pyControl of course to make those calls to BIG-IP).  I had toyed ... (more)

Live from Microsoft Tech Ed: Day Two

It was a little crazy, ok? Just thought I’d start by answering the obvious question, “What happened to Day One?”  I lost the trackball in my blackberry and it’s really hard to use without that.  I can navigate a little, but some things I just haven’t been able to get to.  I wanted to tweet up the event, but alas, my technology has failed me.  But I digress… Tech Ed is my first official show with F5, so I was a little concerned about representing the company well and providing value to the conversations with passersby.  Turns out, there’s no rocket science to this.  If you believe ... (more)

Mitigate Java Vulnerability with iRules

I got a request yesterday morning to asking if there was a way to drop HTTP requests if a certain number was referenced in the Accept-Language header.  The user referenced this post on Exploring Binary.  The number, 2.2250738585072012e-308, causes the Java runtime and compiler to go into an infinite loop when converting it to double-precision binary floating-point.  Not good.  Twitter is ablaze on the issue, and there is a good discussion thread on Hacker News as well.  So how do you stop it?  At first, this appeared to be a no-brainer, just copy that string and drop if found in that... (more)

Networking Options with LTM VE

Virtualization Expo on Ulitzer If you haven’t yet downloaded the  BIG-IP LTM VE trial, I highly suggest you do.  It is a fully-functional LTM, rate-limited to 1Mbps throughput.  If you’re not familiar with virtualized environments, hopefully this blog will fill in some blanks for how to get started on the network front. Getting Started Before downloading your VE image, you need to choose what virtualization environment you’re installing into.  The supported options in the type 1 hypervisor are VMWare ESX version 4 and ESXi version 4.  For the type 2 hypervisor (requiring a host O... (more)