On Mar 3, 2004, at 12:56 PM, Martin McCormick wrote:
        Does the ping utility do some sort of name checking when one
wants to ping a particular host by name?

Ping uses gethostbyname2() to resolve the target hostname.

        A person with an account on a FreeBSD system demonstrated to
me that one could successfully look up a given host using nslookup but
if you pinged that host by name as in

ping host_name.domain, one got an immediate complaint from the ping
utility like:

ping: cannot resolve cl_mail1.mydomain: Unknown server error

That sounds about right. nslookup is a testing utility which allows one to query RRs for string you want, including ones which correspond to invalid hostnames.

The underscore is not allowed in Internet hostnames-- see RFC-952 and -1123.


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