> My ISP was so nice to give me a domain name (pukruppa.net) and
> assign it statically to an IP (213.146.114.24).
> [So now everybody in the world can telnet pukruppa.net and crack
> my private machine :-)  ]
> 
> From reading manuals one should think, that now I could give my
> machines names like one.pukruppa.net, two.pukruppa.net, etc...
> and all these would be reachable via internet - but they aren't.
> The only one that can be accessed is pukruppa.net .

You need to add A records (or CNAME records) to your DNS
zone pukruppa.net:

  one.pukruppa.net.     A   213.146.114.24
  two.pukruppa.net.     A   213.146.114.24
  ...

Or, alternatively, use CNAME (don't forget the trailing dots)

  pukruppa.net.         A     213.146.114.24
  one.pukruppa.net.     CNAME pukruppa.net.
  two.pukruppa.net.     CNAME pukruppa.net.
  ...

Setting A records directly saves one additional lookup though.
You could also use Wildcard DNS records (*.pukruppa.net.   A  ....),
but I wouldn't recommend this.

BTW, you could also use a better PTR record for your IP:

24.114.146.213.IN-ADDR.ARPA domain name pointer 
reverse-213-146-114-24.dialin.kamp-dsl.de

kamp-dsl will be glad to set up a reverse record for you
if you asked them.

-- 
Cordula's Web. http://www.cordula.ws/

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