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Archive for December, 2007
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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... -
Telnet For SSL
Posted on December 15, 2007 | No CommentsI mentioned I used telnet quite a bit a few posts ago. I don’t use it to log into anything (plain-text passwords over the wire anyone?), instead I use it as a basic TCP connection utility. I see if I can establish a TCP connection,... -
Microsoft.com: Used To Use NLB, Now Uses NetScaler
Posted on December 13, 2007 | 1 CommentAs seen on Slashdot, a Microsoft tech blog outlines their hosting environment for microsoft.com. One of the interesting items that came up was that until a year or so ago, they were using NLB (Network Load Balancing), the no-frills Windows server Layer 4 load balancing... -
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,...