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From: lars@spectrum.CMC.COM (Lars Poulsen)
Newsgroups: comp.dcom.lans
Subject: Re: IP Addresses on WD8003E
Message-ID: <1990Jul27.060743.26946@spectrum.CMC.COM>
Date: 27 Jul 90 06:07:43 GMT
References: <1990Jul26.062713.24394@rfengr.com>
Organization: Rockwell CMC
Lines: 29

In article <1990Jul26.062713.24394@rfengr.com> rfarris@RFEngr.com (Rick Farris) writes:
>I've managed to confuse myself about IP addresses.
>
>I did-the-right-thing and wrote to NIC for an IP address,
>but now that I'm ready to set the addresses on my WD8003s, I
>find nothing but a sticker saying "Network Address 0000C0
>5E9A18."  Where are my address jumpers?
>			      
>Is there a default address hardwired into the card?  Does
>the tcp/ip driver automatically change it when the system
>boots?  Did I buy cards that can only reside at one address?

There are two separate layers of address, and tehy are not related.
The sticker shws the hardware address. It is programmed into a chip on
the board and should not be changed. The IP address is what you tell the
software that will speak TCP/IP.

When somebody wants t send packets to your machine, they will broadcast
an ARP (Address Reslution Protocol) query on the ethercable, saying in
essence: "I need to speak to 123.4.5.6, but I don't know his ethernet
address". The software in your machine will then reply "I'm here".
Now both machines know the ethernet address that goes with the other
guy's IP address, and they squirrel this knowledge away in a table.

So: As hard as you try, you will NOT find a place to strap your
IP address into the board.
-- 
/ Lars Poulsen, SMTS Software Engineer
  CMC Rockwell  lars@CMC.COM