Re: "who" is guilty - "named" is not!!!
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.
ABO
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