[Guy Harris <gharris@xxxxxxxxxxxx>]

> The resolv.c code is protected against long DNS timeout (there is a longjmp
> after, currently, 2 seconds).

...and it appears to, in effect, cache the failure, so that it won't try
to look up the offending address again.

2 seconds is still a significant amount of time, though, and if there
are multiple IP addresses all of which require consulting a dead DNS
server in order to translate them into names....

I've seen, on occasion significant differences between the time to load
a capture file when I specify the "-n" flag and when I don't.