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Date:	Sat, 15 May 1999 08:46:23 PDT
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-programming@scoug.com
To:	scoug-programming@scoug.com
Subject:	SCOUG-Programming: TCP/IP ping w/ two NICs

Content Type: text/plain

> On Fri, 14 May 1999 20:45:47 PDT, Peter Skye wrote:
>
> >If I have two NICs in a machine, and I say "PING 192.68.2.1", what does
> >TCP/IP do? Do I have to tell it where 192.68.2.1 is? If so, how?

Rollin White wrote:
>
> The first step is to setup MPTS for both network cards with the TCP/IP protocol. The process is
> basically the same as one card, so I won't go into the details unless someone wants me to. When
> you add TCP/IP to the second card (actually, the second card you add TCP/IP to, not necessarily the
> second network card), you will notice it has a 1 next to it instead of a 0. As far as TCP/IP is
> concerned the card with the 0 is lan0, and the card with the 1 is lan1.
>
> Then open the TCP/IP configuration notebook. On the first page you'll see a list of LAN interfaces
> (corresponding to lan0, lan1, etc). As you select each interface (network card), you assign a distinct
> IP address to it (If you try to assign the same IP address, bad things will happen and your world will
> implode).
>
> This is conceptually the same thing that happens when you have a network card and then you
> connect to the Internet. Your LAN card has an IP address (static, such as 192.168.1.1), and then a
> dynamic one assigned to the PPP0 interface that is dynamically assigned.

So I've got the two NICs in my machine and they're set up as you say.
And I then type "PING 192.168.2.1" at the command prompt. What does
TCP/IP do? Does it send the PING out on both NICs to see what happens?
Does my world implode? Does Dave Watson enter through the back door and
hit me with a cookie?

- Peter

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