Toronto Mike

DNS Cache

DNS Cache

Boys and girls, today we're going to learn about DNS Cache and your ISP.  Every time you access a site from your ISP, they cache the URL, as well as its associated IP number.  If their network is properly setup, these DNS cache records should expire at least every 24-hours. Unfortunately, this is rarely the case and attempts to visit websites at their new home fail because you're taken back to the old server account.

Usually this is because an ISP didn't configure their servers to expire the DNS cache records at the appropriate intervals but I can't just blame the ISPs.  There are numerous Internet Routers and Internet Caching Engines that must update/clear their DNS cache as well.

The end result is a rather murky 2 to 4 day propagation period during which time you may or may not get through to the new http://torontomike.com.  It all depends upon the route your PC took on the information superhighway.  Things should be back to normal by Thursday.

And yes, there will be a test.

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About Toronto Mike
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I own TMDS and host Toronto MIke'd. Become a Patron.