GTM Classless Classes

I love ingenuity.  DevCentral community member wassim asked a question a little more than a month ago that has been asked several times before: How do you build a class in GTM so you don’t have to use a hoard of if statements to account for your addresses?  Well, classes (datagroups) aren’t yet supported in GTM iRules, so the options have been sparse.  One option that could be utilized is to build a list that you can initialize in RULE_INIT: 1:...

IP::addr and IPv6

Did you know that all address internal to tmm are kept in IPv6 format?  If you’ve written external monitors, I’m guessing you knew this.  In the external monitors, for IPv4 networks the IPv6 “header” is removed with the line: IP=`echo $1 | sed 's/::ffff://'` IPv4 address are stored in what’s called “IPv4-mapped” format. An IPv4-mapped address has its first 80 bits set to zero and the next 16 set to one, followed by the 32 bits of the IPv4 address.  The prefix looks like this: 0000:0000:0000:0000:0000:ffff: (abbreviated as ::ffff:, which looks strickingly simliar—ok, identical—to the pattern...

Microsoft Exchange 2010 iRule Workflow Visualized

F5’s own John Alam sent over his latest Visio creation to share with the DevCentral community.  This diagram details the workflow of the comprehensive exchange services iRule described in the Microsoft Exchange 2010 Deployment Guide. Enjoy. For visio, pdf, png, & svg versions of this image, click here. Related Articles Microsoft Exchange 2010: HELO New Architecture Webcast - Microsoft Exchange Server Availability And Scalability Exchange Persistence Duality and iRules > DevCentral > F5 ... How Microsoft deployed Exchange Server...

Networking Options with LTM VE

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 OS such as linux or Microsoft Windows) the supported option is VMWare...