What happens if you point two CNAMEs at each other? Not much, really(alexanderell.is)
alexanderell.is
What happens if you point two CNAMEs at each other? Not much, really
https://alexanderell.is/posts/cnames/
5 comments
We would have found a renewable and clean energy source :(
Played a bit around with this a few years back. Made an endless chain of CNAMEs to see how resolvers would handle it. Turned that nothing (bad) happened as the resolvers gave up after a while
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Wonder what metric(s) make them decide to quit?
I would have thought there is some form of loop detection, similar how mailservers ckeck for it in email forwarding or autoresponding
Either a hard limit on the number of jumps, or Floyd's Tortoise and Hare Algorithm.
Don't forget to add a dot at the end of the line to make it work.
www.example.com CNAME exemple.com.
www.example.com CNAME exemple.com.
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Sorry to hear that not much happens. Nothing cool ever works out the way you hope it might.