On 13 Aug 1997, Eloy A. Paris wrote: > Hello all, > > following the "who" vs. "named" controversy, I have found something that > leads me to think that the problem of "who" slowness is because of a > bug in "who" and not in "named" or because of incorrect DNS setup: > > It happens that when "who" is run, "who" tries to do a name lookup > but it uses the wrong host name so even when the host is local, > it goes out to the Internet until somewhere, someone says that they > name does not exist. Take a look at this debug output from named that > was generated after I ran "who": > [snip] > > The first time I type "who" it is very slow because it has to go out > to the Net to know that the host does not exist. After the first time > "who" is faster because the information (about the invalid host names) > is cached. > And that explains the short caching times; named probably only caches DNS lookup failures for a default minimum time.
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