Internet Tip: DNS caching can make DNS changes erratic…

Internet Tips fans,

This is part 2 of the 15th tip in a series of tips on how to do tricky things with URLs.

Warning: DNS caching can also cause erratic behavior (not only the delays I explained in a previous tip) when you change a DNS record. I’m not sure exactly why, but I’m seeing a case today (right now) where the IP address reported by nslookup keeps switching back and forth between old and new values. Not good…

See:
- http://bristle.com/Tips/Internet.htm#dns_caching_can_make_changes_erratic

BTW, this is NOT the “whole lot more interesting” 19th tip that I promised yesterday, about phishers. That one got bumped by this problem I saw today. This is really part 2 of the 15th tip I sent out May 27. The “whole lot more interesting” 19th tip is coming soon [said Fermat :-]…

(If you’ve been to the page recently, be sure to refresh your browser to see the latest version, dated 6/11/2021.)

Enjoy!
— Fred