Hi Folks,
Here I go trying to break the rules again .. or am I?
When I dial-up, my "gateway" machine gets an IP address
which I can find out.
So, from outside, I can telnet, ftp etc. to my gateway.
If I want to telnet to one of the machines inside my LAN,
I could first telnet to the gateway, and then from there
to any of the others. A bit cumbersome, but not a problem.
However, if I want to FTP to one of my internal machines,
it's much more cumbersome: first FTP to the gateway, then
telnet to the gateway and from there FTP to the desired
machine.
I'm wondering if there's some sort of protocol for getting
directly to an "internal" machine (whose IP address is not
known to the Net) by a kind of "relay" via the gateway (whose
external IP address is known to the net).
There's an analogy in Internet mail, whereby you can force
mail to aa.bb.cc.dd to be routed via AA.BB.CC.DD, by addressing
to
@AA.BB.CC.DD:user@aa.bb.cc.dd
(so-called "routing addresses). So can I, for instance, do
something like
telnet @213.130.142.61:192.168.0.7
(where 192.168.0.7 is the address of a machine on my private
LAN, and 213.130.142.61 is an IP address my gateway waas recently
given on dialup)?
And, similarly, something like
ftp @213.130.142.61:192.168.0.7
??
Or is there a different way to do it? Or no way at all?
When I try the above on my LAN, e.g.
telnet @192.168.0.7:192.168.0.1
I get "Aborted", and
telnet 192.168.0.7:192.168.0.1
gives me
192.168.0.7:192.168.0.1: Unknown host
and similarly "Name or service not known" with FTP, so
presumably I've got the details wrong above, if it's
possible at all. But you get the idea ...
With thanks, and best wishes to all,
Ted.
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E-Mail: (Ted Harding) <Ted.Harding(a)nessie.mcc.ac.uk>
Fax-to-email: +44 (0)870 094 0861
Date: 03-Jul-05 Time: 21:34:12
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