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Date:	Wed, 9 Jan 2002 01:37:50 PST7
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Cable connect analyze

Content Type: text/plain

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> Peter Skye wrote:
> >
> > First try pinging your own machine:
> >
> > ping 127.0.0.1

Sheridan George wrote:
>
> I don't think this will work if he is using 192.168.123.x? As
> you pointed out, Peter, he has a long lease time so he may
> be on DHCP on his LAN. In that case he will have to ping
> whatever DHCPMON says his machine's IP is currently.

Hmm. Sheridan and Ray, try pinging 127.0.0.1 on your machines and see
what happens.

I *think* that the address 127.0.0.1 is a spec which I read in an RFC
and that it always points to your local machine.

I *think* that 127.0.0.1 is a valid IP address on every single machine
on a network but it always points to the machine where you are located
-- in other words, the address 127.0.0.1 goes to a machine's TCP/IP
stack which looks at it and says, "hey, that's me!".

Out on the network, however, nobody else can get to your machine using
127.0.0.1 because *their* TCP/IP stack will say "hey, that's me!" and
think they are requesting access to their own machine.

So any of you guys with firewalls in place, try pinging 127.0.0.1 and
see what happens (unplug the network cable for this test to make sure
the response doesn't come from elsewhere).

*My* SMC firewall is still in its box, where it has been vacationing
since I bought it six months ago. I don't have a firewall. That's why
I'm not giving any of you my IP address. :)))

- Peter

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