Re: OT ping sample code
Re: OT ping sample code
- Subject: Re: OT ping sample code
- From: Chilton Webb <email@hidden>
- Date: Mon, 12 Jan 2004 17:09:28 -0600
Hi Igor,
On Jan 12, 2004, at 12:57 PM, Igor garnov wrote:
There is no general way to tell if a host is online without knowing
some
additional information about the host. If you want to know if a web
server is up you would try an HTTP request, if you want to know if an
FTP
server is up you would try an FTP request. Without that kind of
additional information, there isn't any universal solution.
There must be a set of ports used by Windows, Mac and Unix/Linux I
suppose... I mean some 'intersection' of sets of ports the machines on
these OSs would normally listen on.
What exactly are you trying to do? With a bit more info we could
probably help more.
FWIW, when I configure a server, for security reasons, I disable any
and all ports I'm not using on that server. In these cases, using a Mac
provides me with a nice set of options not available on other operating
systems, such as the ability to stream AppleEvents through the web
server (and as of Panther, this came back!). So with a pair of tiny
apps I use for this, I don't need any other ports open. And at least on
my OS9 based servers, I'll typically only have one port open, and block
the rest at the firewall.
If you want to know what ports are routinely open on a particular type
of server though, just pick up any issue of 2600, or any of the
zillions of hacking/hackproofing books available at fine booksellers
everywhere, and see what ports they suggest breaking into or closing up
(depending on the focus of the book).
-Chilton
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