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Re: hostname



On Thu, 2007-11-01 at 10:11 -0700, Rick Stevens wrote:
> On Thu, 2007-11-01 at 17:00 +0000, tony chamberlain lemko com wrote:
> >  Someone wants to use java and get a host name from an IP address.
> > 
> > I know how to do it lcoally through /etc/hosts BUT the host file does
> > not
> > 
> > have names for every IP address reachable.
> > 
> >  
> > 
> > Someone found http://www.faqs.org/rfcs/rfc953.html which looks like
> > you are supposed to be
> > 
> > able to use port 101 of a machine and connect to it and echo a command
> > and it should respond.
> > 
> > It also says HNAME should give the host name so I tried (from
> > 192.168.5.191)
> > 
> >       echo HNAME | nc -e cat 192.168.5.15 101 
> > 
> > which I would guess should return the host name for machine
> > 192.168.5.15, but I got
> > 
> > no response and a return code of 1.  There is probably something I am
> > overlooking.
> > 
> > Anyone know how to query this port?  (both machines are CentOS 4.5) 
> 
> I've seen very few systems that implement that server (the one on port
> 101).  The correct thing to do is to use a reverse DNS lookup such as
> "dig -x 192.168.0.1" (assuming that the machine is registered in DNS).
> This is reasonably easy to do in Java.  Look for functions such as
> "gethostbyaddr".
> > 
The host command also does this.
--
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E Pluribus Unix
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Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam sbcglobal net


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