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articleirulesbig-ipdevnewstechtip December 11, 2012 by Colin Walker
F5 is the creator of and home to many different, powerful technologies. We offer some of the most powerful, advanced application delivery technology in the world. As with any advanced technology, however, there are often times terms and names flying around in documentation, publications or online communities that aren’t necessarily part of your daily speech. Until you’re a bit “in the know” some of these things can be confusing or even daunting. As such, we’ve gone ...
iApps, introduced in v11, have a primary function in controlling the object creation and management for an application delivered by BIG-IP. As discussed previously, however, anything that can be accomplished in TMSH can be done in an iApp, so what better way to quickly generate checksums on iRules than via an iApp. New in v11.1, you can add either a checksum or a digital signature to an iRule (but not both). For iRules that have been signed or had a checksum applied, there will be a line immedia...
Introduction Ever wanted to “failover” a virtual server to an LTM that is not part of the same HA (high availability) pair? This is a common occurrence for any engineer that has ever had to upgrade their BIG-IP hardware platform or been part of a “consolidation” project. If the virtual is being addressed via DNS this can be as simple as creating the virtual server (using a different IP) and its dependencies on an adjacent unit, then cutting over by updating the A record. Most of us know that it...
Sometimes I need to log information from iRules to debug something. So I add a simple log statement, like this: when HTTP_REQUEST {   if { [HTTP::uri] equals "/secure" } {     log local0. "[IP::remote_addr] attempted to access /secure"   } } This is fine, but it clutters up the /var/log/ltm log file. Ideally I want to log this information into a separate log file. To accomplish this, I first change the log statement to incorporate a custom str...
I recently completed a successful major LTM hardware and software migration which accomplished two high-level goals: ·         Software upgrade from v9.3.1HF8 to v10.1.0HF1 ·         Hardware platform migration from 6400 to 6900   I encountered several problems during the migration event that would have stopped me in my tracks had I not (in most cases) encountered them already during my te...
articleiappstmshdevnewstechtip May 14, 2010 by Jason Rahm
The BIG-IP GUI is pretty slick and there have been massive improvements in function and efficiency since my first exposure in version 4.2.  As good as it is, however, some tasks are just better suited to the CLI.  Take maintenance, for example.  How long will it take you to remove an iRule from a virtual server?  A quick attempt from login to removal was about 14 seconds.  While already logged in, it took me about nine seconds.  So assuming you know exactly what vir...
articlevirtualizationdevnewstechtip February 17, 2010 by Colin Walker
The already impressive flexibility and power of the BIG-IP takes a giant leap forward with the announcement of the BIG-IP LTM VE. This Virtual Edition of LTM not only allows for extremely easy trial of the technology and an easily attainable resource for local development or testing, but it also shows that no matter how many tricks LTM might have, there's likely one more around the corner. If you're like me then you're already an F5 user. I use F5 gear just about every day while wri...
articleiappstmshdevnewstechtip January 12, 2010 by Jason Rahm
With the release of v10.1, tmsh has added a scripting language to accompany the shell introduced in v10.  To steal Yoda's linguistic skills...Powerful, this will be.  So powerful in fact that we here at DevCentral have created a wiki namespace and a forum for tmsh related content and questions. Last Spring when v10 was released, I wrote an article on how to use the new traffic management shell to configure GTM.  In this article, we’ll build the same configuration from a questionn...
Security extensions were added to the DNS protocol as a means of countering malicious attacks such as cache poisoning, domain hijacking, and man-in-the-middle attacks.  The extensions are described in detail in RFC 4033 (Introduction and Requirements), RFC 4034 (Resource Records), and RFC 4035 (Protocol Modifications).  Understanding what DNSSEC is and why it's important is well covered elsewhere -- whitepapers, research, etc at http://www.dnssec.net and there's a nice implementat...
articlebig-ipnewstechtip April 21, 2009 by Jason Rahm
A couple weeks ago I blogged about the enhancements that v.10 brought to GTM,  the most anticipated being that GTM now has a command line for object configuration!  The Traffic Management Shell, or tmsh, can be set as the default shell for your users, or if you have administrative access to the console, you can enter the shell with the tmsh command (go figure!).  This tech tip will work through a wideIP configuration shown in the image below, built out exclusively in the tmsh...
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