[dns-operations] Who Ignores TTLs ?

Rick Jones rick.jones2 at hp.com
Thu Feb 17 17:31:23 UTC 2011

Mark Andrews wrote:
> It's the apps not the caches that don't respect TTLs.

Well, they can't really.  Certainly not directly.  Getaddrinfo() (or 
gethostbyname()) don't give TTL information to the application.  The only way 
they could "respect" the TTLs would be to make a getaddrinfo() call before every 
connection, no matter how short-lived, in which case the complaint would be 
applications making too many DNS queries and every end point in the Internet 
should run their queries through a system local cache.

rick jones

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