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iRule: react to down pool

The question came up whether it is possible to detect a pool being down and react to that accordingly. If the pool is down, I'd like to be able to redirect to a system down page and send the original URI so I can log it in our application and pe...

iRule: CCN Scrubber

This is a tie-in to my last post regarding a SSN scrubber. How would you go about scrubbing out Credit Card Numbers? This isn't as simple as searching for a nnn-nn-nnnn pattern. CCNs vary in length depending on the issuer of the card. But one thi...

iRule: SSN Scrubber

Want to secure your site from accidentally exposing Social Security Numbers? No problem says the iRules team. This example will show how to, for a given class of uri's, scrub the SSN's from response content replacing them with the blanket "xxx-xx...

iRule: modify uri and response

  I'm trying to find a way with an iRule (or any functionality really) to take a url like https://apple.fruit.com/application/xyz.html and convert it to https://peanut.bean.com/application/xyz.html as it goes through the bigip (running v9) then ...

iRule: modifying the uri without a redirect

In this case the user wants to change the uri of a HTTP request without forcing a redirect from the client. We have a unique situation where a client-based DLL is uploading a file to our website. For reasons beyound my control I need to change t...

iRule: passing client cert to node

In this case, the BIG-IP is terminating SSL connections but the backend web server needs the information from the certificate but doesn't want the BIG-IP to re-encrypt the traffic to the node. We have successfully configured the BIGIP device to ...

iRule: switch vs if-elseif-else

The following question came in regarding optimization of iRules: Do you know whether if-elseif (nested if) or switch (case) is more efficient using the TCL interpreter on v9 ? In his usually verbose self, unRuleY responded as follows: You coul...

iRule: Logging lb failures

The question here was how to log a lb failure (no nodes available) but not on every connection. It would preferably log an error every 50 lb failures. unRuleY responded with the following rule that will go a step further and create an array that w...

You say Luhn, I say mod 10

Some fun stuff has been going on in the iRules forum with regards to security. If you are interested in securing your site from exported social security numbers, you might want to take a look at this Tech Tip derived from an iRule. Most recently ...

DevCentral iRules Contest for BIG-IP v9 Underway

With the introduction of iRules for BIG-IP v9 last fall, we unleashed some pretty powerful technology for influencing IP application flows. We continue to hear about amazing solutions from customers and partners worldwide that simply amaze us. It has...

SSL Trust Provider for Java

I've blogged about Self-signed Server Certificates and how they can cause havoc with client java applications. We'll I put the call out there to provide solutions and a very slick one has arrived!  XTrustProvider.java: /* * The contents of this...

64-bit numbers in perl

A question recently came up in the iControl forums about how to deal with the statistics returned by our iControl interfaces. In 9.0, we changed the interfaces to return true 64-bit values consisting of a structure of a low and high 32-bit value (t...

Seven

Well, today marks year number 7 for me here at F5 Networks. 1998 seems so long ago and F5 has changed so much in those years. I was going to include an image of Seven of Nine in this post but didn't want to imply that I would only be here for 2 m...

Where the heck does the name F5 come from?

I got asked this question today. I've been around here long enough to have heard all the supposedly "true" origins of the company's name. The most frequent assumption I've heard is that the company is named after the "F5" key on a standard keyboard. ...

blogshares

Ok, I've had my blogshares listing for a while now and nobody has purchased even a single virtual share! I figure I could be a rogue and go buy back all my open virtual shares but that wouldn't be any fun. Maybe I'll bring this up at my next sharehol...

Champagne on a Beer Budget

At Gartner Symposium this week, I've been sitting through some very interesting sessions presented by Gartner analysts. One of my favorites was given by Donna Scott and Deb Curtis. Both have some excellent thoughts on how to transform IT operations f...

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