> the firewall is configured to block pings from outside - security reasons - so 
> called stealth mode

No, you are wrong.  gethostbyname($hostname) correctly resolves my
servers, and I have disabled pings for security reasons. 
gethostbyname($hostname) has nothing to do with pings as a matter of
fact.  It performs a whois lookup and returns the ip address of
$hostname.  

-Dan

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