Resolver behavior on expired TTLs

John Miller johnmill at brandeis.edu
Thu Feb 21 15:38:59 UTC 2013


Hello everyone,

Here's something I hadn't put much thought into until recently--it's 
never been a problem--how do resolvers behave when they receive a 
request for an expired entry in the cache, but cannot contact the 
authoritative nameserver?  I'd imagine they return a SERVFAIL, but I 
could see NXDOMAIN as well.  Does anyone know the answer?

John



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