From: Pete Tenereillo (pt_lbIZZAThotmail.com)
Date: Mon Aug 23 2004 - 15:15:43 EDT
Just out of curiosity I re-ran some old tests (now that I have XP SP2).
I observed what seem to be 2 changes material to GSLB:
a) Only 3 TCP SYN attempts were made to each A record in the list returned, still at delta times 0, 3, 6 seconds. That reduces the time before the next A record is tried to 9 seconds (previously was 21).
b) If connection attempts to all A records fail, it does a new DNS resolution! (previous XP did not re-resolve unless there was 2 min of inactivity). That's a step toward solving the GSLB + H/A issue described in www.tenereillo.com/GSLBPageOfShame.htm. It's by no means a complete fix, because not all nameservers or caches observe zero or low TTLs, and it will be years before enough clients that run previous versions of Windows will upgrade -- but we are making progress! Apparently MS is listening to customers (at least one Fortune 500 made a big stink about this to MS after being unable to get GSLB + H/A working as intended).
I would be very interested to hear other's test results to see if they agree.
Pete.
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