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

Jason Rahm

Subscribe to Jason Rahm: eMailAlertsEmail Alerts
Get Jason Rahm: homepageHomepage mobileMobile rssRSS facebookFacebook twitterTwitter linkedinLinkedIn


Top Stories by Jason Rahm

Back in October, my son’s robotics team said “Hey! You work for a software company, can you build us an application that will help us with scouting and competitions?” Foolishly, ego stepped in before a careful outsourced review of my existing skills could take place, so I said “Sure! Not a web developer, but how hard could it be?” Seriously… how hard could this be? I see web application traffic all the time. On the wire. And I can even manipulate that traffic at the protocol level and do amazing things with it programmatically. But…changing application traffic in flight is not development of that application. Nor is it an understanding of all the considerations one must evaluate and handle to get from idea to solution. So yeah, it is hard. Dang hard. Actually, getting to a dynamic web experience "hello world” is easy, but getting to a working application? Not so ea... (more)

Host that Sorry Page on your BIG-IP!

It's not an uncommon problem trying to figure out where to plant that sorry page in the event your farm is down.  It's also not an uncommon solution to just use your BIG-IP to issue a text-only HTTP::respond.  It works, but it's not, how do you say, visually appealing?  You want to say sorry and mean it.  With pictures.  If you take a stroll through the iRules codeshare, you'll notice several solutions to this problem.  All of them work, with a variety of methods, but user kirkbauer's entry takes it to another level.  Kirk's sorry page irule generator (written in perl) takes all ... (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)

A Catch from the Codeshare: Network Translations

On the side of the road in northern Missouri just north of Mark Twain’s stomping grounds, there is a slice of hillside removed just to the side of the highway. In Arkansas, there’s a nondescript field tucked away in a state park. Short of word of mouth and this thing they call the internet, you wouldn’t be any the wiser that buried or surfaced in these two locations are an amazing variety of geodes and diamonds, respectively. In this article series I will explore recent and well-aged gems from the codeshare, highlighting inventive solutions contributed by you, t... (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)