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Date:	Thu, 10 Jan 2002 08:24:57 PST7
From:	Sheridan George <s-geo@usa.net >
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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ping 127.0.0.1

ctrl-c
... 100% packet loss

dhcpmon

ping 192.168.1.159

ctrl-c
... 0% packet loss

Sheridan

Peter Skye wrote:
>
> =====================================================
> If you are responding to someone asking for help who
> may not be a member of this list, be sure to use the
> REPLY TO ALL feature of your email program.
> =====================================================
>
> > 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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>
> =====================================================

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