Ask Tony
Got a question about load balancing? Considering a few vendors and want some input? Just shoot me an email:tony at lbdigest dot com.
I may even use your question as a post so that it may help others (anonymous, if you so choose).
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Ask Tony Archive
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Web Application Firewall: What’s In A Name?
Posted on November 12, 2008 | 2 CommentsIn my recent review of KEMP’s new LoadMaster software, which includes Web Application Firewall capabilities, Ofer Shezaf (from breach.com) had this to say in the comments section: Systems supporting only snort rules and lacking a positive security model are not usually not considered a web... -
Mega Proxy Not So Mega, Akshually
Posted on September 15, 2008 | 7 CommentsApologies for the LOLcatspeak. I’m incapable of helping myself. The driving force behind Layer 7 persistence (keeping an individual user tied to a specific server in a server group based on HTTP headers instead of IP address) was the dreaded AOL Megaproxy issue. AOL had... -
New Survey
Posted on June 16, 2008 | No CommentsIt’s been about 6 months since the last load balancing/application delivery survey, so I think it’s high time we did another one. So here’s your chance to contribute to the questions: What do you want to know? Put your suggestions in the comments section below,... -
Cisco CSS Replacements
Posted on February 12, 2008 | No CommentsThere was a post today on the lb-l mailing list asking about alternatives to Cisco’s CSS. This is part of a trend I’ve noticed lately, where people who have an existing Cisco CSS installation are looking to replace that gear with new gear. Cisco CSS... -
Troubleshoot Any Load Balancing Ailment: End-to-End Connectivity
Posted on December 20, 2007 | 3 CommentsYou’re stumped. There’s a problem with your infrastructure, and you’re not positive what it is. You checked a few things out, but the symptoms befuddle you. You’re pretty sure it’s not the load balancer, but everyone is pointing at you, and you’ve got no proof.... -
Think You’re Connected? Think Again
Posted on December 16, 2007 | 1 CommentOne issue that trips up people when diagnosing load balancer problems is they see a connection has been made to a virtual service, so it looks like they’re getting through to the real server. That’s not always the case. Depending on how your load balancer... -
BIG-IP V4 Test Script
Posted on December 12, 2007 | 2 CommentsWhen I’m diagnosing load balancing issues, there are three really critical tools I use: TCPDump HTTP Header dump (such as Live HTTP Headers) Telnet Yup, telnet. I don’t know about anyone else, but I use telnet excessively. Basically, I use it to test TCP connectivity,... -
What Application Developers Need To Know About Load Balancers
Posted on November 28, 2007 | 3 CommentsYou’re an application developer. You work in a world of untyped variables, debugging, and hitting reload over, and over, and over, and over again, all in the name of churning out a good web app. You can spot a SQL syntax error from the corner... -
PHP and Load Balancers
Posted on November 27, 2007 | No CommentsI got this email today from Don Keller in New Orleans regarding PHP interacting with a load balancer: I read somewhere that the load balancer you run must support sessions, otherwise you must use cookies.” This is a common type of question that people who... -
How To Choose A Load Balancer
Posted on November 16, 2007 | 4 CommentsI get a lot of questions on what’s the best load balancer to choose. There are currently over 20 vendors too choose from, so buyers can experience a little bit of over-choice shutdown. So, here’s a few tips to help whittle down the vendors. The...