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Security Irules 101: DNS Gravitational Disturbance

Introduction iRules are a powerful tool in the F5 administrators arsenal. They allow administrators to adapt and customize the F5 to their needs. They provide extensive power for security engineers as well. We’ve decided it’s time to revisit... Read more
1 Review

iRules logging to multiple locations with ease

Some months back I was at an account where we were developing some iRules to provide logging detail. One of the complications was that some of the infrastructure to support remote logging was in the process of being implemented and was not... Read more
1 Review

v11.1: DNS Blackhole with iRules

Back in October, I attended a Security B-Sides event in Jefferson City (review here). One of the presenters (@bethayoung) talked about poisoning the internal DNS intentionally for known purveyors of all things bad. I indicated in my write-up tha... Read more
Average Rating: 4.9
3 Reviews

v11.1–Add Signatures or Checksums to iRules via an iApp

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 wha... Read more
1 Review

DNS Resolution via iRules: NAME::lookup vs RESOLV::lookup

There are so many things that you can do with iRules that it can be pretty staggering to narrow down what the "most useful" commands are, but if I were given that task and absolutely had to, I would say that DNS resolution ranks up there... Read more
Average Rating: 4.9
3 Reviews

Multiple Certs, One VIP: TLS Server Name Indication via iRules

An age old question that we’ve seen time and time again in the iRules forums here on DevCentral is “How can I use iRules to manage multiple SSL certs on one VIP"?”. The answer has always historically been “I’m sorry, you can’t.”. The... Read more
0 Reviews

One Time Passwords via an SMS Gateway with BIG-IP Access Policy Manager

One time passwords, or OTP, are used (as the name indicates) for a single session or transaction.  The plus side is a more secure deployment, the downside is two-fold—first, most solutions involve a token system, which is costly i... Read more
Average Rating: 4.9
7 Reviews

Monitor Your iRule Performance with iControl and Google-O-Meter Charts

iRule performance has long been a question our users have asked about.  We get questions all the time about how to determine what impact a specific iRule has on the normal operation of the BIG-IP’s they are running on.  The question is a... Read more
0 Reviews

Laptop Load Balancing For The Developer With BIG-IP LTM VE

Introduction So, you've probably read all about the BIG-IP LTM VE.  You've gone through the download process and got the thing configured and running in VMWare.  You've even gone through the initial configuration steps to ge... Read more
0 Reviews

Unbind your LDAP servers with iRules

LDAP is one of the most widely used authentication protocols around today. There are plenty of others, but LDAP is undeniably one of the big ones. It comes as no surprise then that we often hear different questions about using F5 technology with... Read more
2 Reviews

Can iRules fix my cert mismatch errors?

SSL encryption as a means of security on the web isn't a new concept. We've talked about it here on DevCentral many times, and it's as pedestrian a concept as a corndog on the boardwalk to most internet users. We've talked about... Read more
0 Reviews

Non-English DNS Request filtering via iRules

When talking about iRules there are many themes that come up: application fluency, flexibility, control, high-availability. Among the themes that are often related to iRules one of the most important, in my estimation, is the extremely granular... Read more
0 Reviews

RADIUS Load Balancing with iRules

What is RADIUS? “Remote Authentication Dial In User Service” or RADIUS is a very mature and widely implemented protocol for exchanging ”Triple A” or “Authentication, Authorization and Accounting” information. RADIUS is a relatively simple,... Read more
1 Review

Radius Aware Load Balancing via iRules

RADIUS is very popular authentication method that is being widely used in amongst some of the top service providers around the world, not to mention in deployments ranging from enterprise corporate environments to clustered mail systems and back.... Read more
0 Reviews

iRule Security 101 - #05 - Avoiding Path Traversal

Path Traversal is an attempt to access files and/or directories stored outside web root folder. If successful this could allow malicious users to view content they were not intended to see, execute programs that have lax permissions and were... Read more
0 Reviews

iRule Maintenance Windows

A fun, but not well known, feature on BIG-IP is the Statistics Profile. This tech tip is the second in a series on how the Statistics Profile and iRules, when working together, can save time, productivity, and your sleep! The Scenario: Imagine... Read more
Average Rating: 4.9
3 Reviews

Custom Reporting with iRules

In BIG-IP version 9.2, a new profile type was added that is very powerful but isn't well understood. The Statisitcs Profile enables the creation of custom statistics. What makes it interesting is that it's accessible from within iRules. ... Read more
1 Review

Offload Authentication with iRules

As the applications being driven by webservers become more and more complex, Applications Developers are always looking for ways to increase efficiency or do away with unneeded processing time. One of the ways that I believe that Applications can... Read more
1 Review