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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

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 the guess work out of the process for you.  Dump the perl script in /var/tmp, give execute permissions to root, and off you go.  Here's a sample configuration, just taking Google's main page: [root@ltm01:Active] mibs # /var/tmp/sorrygen.pl Welcome to the F5 Sorry Page iRule Generator This s... (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)

Mr. “Persistently Different” Moving Over, Not On

The leagues of @dmacvittie followers are surely aware, but for the benefit of the rest of the community, I’d like to share that DevCentral’s own, Don MacVittie, has moved over to another team within the F5 family.  Fear not (or be more afraid, take your pick!) as Don will continue to display his wit and charm through his series of information blogs.  Don has been a consummate professional since I joined the team.  Even through his final days, which happened to coincide with the launch of the new DevCentral, he was intimately concerned with the quality of the product and worked t... (more)

Live from Microsoft Tech Ed: Final Day

So I guess I’m on the even days plan here at Tech Ed, today being the fourth and final day of Tech Ed…  Yesterday I got the chance to walk around the exhibitor hall and take a look at the exciting offerings on the floor.  Microsoft had three very large sections with breakout booths for all their product offerings.  I stopped and chatted with a few experts in the Server 2008 R2 virtualization offerings, and watched a couple System Center demos as well.  Speaking of System Center, did you know F5 has a management pack for System Center?  I talked to several booth visitors yesterday... (more)

Let iRules Work Around that ASP.NET Padding Oracle Attack

Microsoft released advisory 2416728 on Friday after researchers Thai Duong and Juliano Rizzo demonstrated the attack on ASP.NET with their Padding Oracle Exploit Tool.  The attack itself preys on a bug in ASP.NET’s AES implementation, which you can read about over here at threatpost.  So what’s the reward for a successful attack?  It’s not going to allow the attacker to execute code or elevate rights, but it does all the attacker to read potentially sensitive data that could then be further used to compromise the system. The mitigation for this attack is to obfuscate the server ... (more)