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Entries for March 2009

If you’re new to this series, you can find the complete list of articles in the series on my personal page hereIf you are writing applications to sit behind a Load Balancer, it behooves you to at least have a clue what the algorithm your load balancer uses is about. We’re taking this week’s installment to just chat about the most common algorithms and give a plain- programmer description of how they work. While historically the algorithm chosen is both beyond the developers’ control, you’re the ...
Welcome back for another episode of the ABC's of NSM.  What's NSM you say?  We'll go with Network and System Management, but you could throw Security in there as well.  We'll work our way through the alphabet over the next several weeks looking at  tools and concepts along the way for all the administrators out    there.   By the way, you can thank Joe for the format & Don for the title  (I  couldn't for the life of me come up with one.)   Today's letter Q is for Qcheck.  Qcheck is a free netwo...
Long URLs and variable names increase transfer size which wastes bandwidth and money o3 magazine has a great article on the impact of long URLs on bandwidth; specifically on how much bandwidth is wasted by excessively long URLs and variable names within HTML, JavaScript, and CSS selectors. What the author does not mention, and he really should, is that wasting bandwidth can translate into wasted dollars, as well. This is particularly true of applications that might be hosted in a cloud environme...
articlecloud March 30, 2009 by ichiro
はじめに: 今月のiRuleではBIG-IPでproxy.pacファイルを配布する方法を紹介します。一般的な企業LANではプロキシサーバが利用されているケースが多いと思いますが、 サーバによってはプロキシサーバを介さずにアクセスする必要があるなど、ブラウザのプロキシサーバ設定は複雑になりがちです。 そういった場合、proxy.pac(プロキシサーバの自動構成スクリプト)ファイルを利用していることが多いと思います。しかし、そのためだけにWEBサーバを用意するのもなかなか大変なのが事実です。 proxy.pacファイルが配布できなければ、クライアントのWEBアクセスは止まってしまいますから、このサーバの重要性は侮れません。でも配布するコンテンツはproxy.pacだけ・・・・それならBIG-IPにさせてみたらどうでしょうか。以下でも詳細をご確認いただけます。 https://devcentral.f5.com/wiki/default.aspx/iRules/Proxy_Pacfile_Hosting_without_need_for_Web_servers.html ...
articlefirefoxhttpwatchie8us March 30, 2009 by Jason Rahm
The browser wars don't interest me that much.  Personally, I want my browser to a) present my content in a pleasing intended way and b) not crash.  All the rest is gravy.  That said, I use both IE and Firefox, the former as it is best suited (or required) for some of the administrative tasks on my plate, and the latter because I prefer it.  So I downloaded Internet Explorer 8 this morning because I was curious about how well the touted gains in performance would bear out.  Before installing IE8,...
articleirulesbig-ipdevnewstechtip March 30, 2009 by Colin Walker
iRules is an event driven language. This has been discussed before, but to recap briefly, here’s what “Event Driven” means in iRules terms: iRules code is written inside event blocks. Those event blocks translate to times within the life-cycle of a connection to your LTM. By putting your code inside a given event block you are ensuring that it executes at a particular point in that transaction. I.E. HTTP_REQUEST code is executed once a request has been received, not before, so you’re safe to...
Keep in mind that the time it takes a human being to blink is an average of 300 – 400 milliseconds. I just got back from Houston where I helped present on F5’s integration with web application security vendor White Hat, a.k.a. virtual patching. As almost always happens whenever anyone mentions the term web application firewall the question of performance degradation was raised. To be precise: How much will a web application firewall degrade performance? Not will it, but how much will it, degr...
Taking the rush of content on DevCentral in stride, I'm back again with 5 more items of interest for you that you really shouldn't miss. Hopefully the week's been good for you, whether that means bug-free code, trouble free system patching or happy clients. Things haven't really slowed down here since being turned "up to 11", so there's plenty to do and digest for everyone. Amidst the always churning stream of geeky goodness that DevCentral has to offer, there are rumblings lately of very cool t...
Welcome back for another episode of the ABC's of NSM.  What's NSM you say?  We'll go with Network and System Management, but you could throw Security in there as well.  We'll work our way through the alphabet over the next several weeks looking at tools and concepts along the way for all the administrators out    there.   By the way, you can thank Joe for the format & Don for the title (I  couldn't for the life of me come up with one.)   Today's letter P is for Pyrlshell, my made up word for P...
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