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RE: Ethernet does not work

Although it is off-topic I want to correct your remark about the router.
A router is *not* necessary in a LAN as long as all devices have an IP
address in the same network range.
So, a router (or default gateway) address is not needed in this case!
Also, the router address can be anything, it doesn't have to be ending in 1
(but in practice it often is 1 or 254 for practical reasons).
Simplified: all computers use subnet mask for example, so all
IP adresses should have the same first 3 numbers in the address (as stated
correctly in your example: 192.168.0.x, where 0 < x < 255).

Router functionality is only needed if you need to communicate with an
IP address range other than your own (for example 192.168.1.x in the example

If it is not possible to ping the other computer first check your cabling (a
blinking LINK indicator does not imply a correct cable!) and check your IP
address and subnet mask configuration.


Andre PE1OIG.

-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Bruce Bostwick
Sent: Monday, November 26, 2001 22:19
To: amsat-bb@AMSAT.Org
Subject: Re: [amsat-bb] Ethernet does not work

> I want to connect my notebook B (OS is XP) with my computer A (OS is
> Win2k
> or Win NT 4) via a Ethernet LAN and cross-over cable.
> The adapters seem to work. The icons appear on the screen. The LANs are
> activated on both. Computer A tells me, it has sent 644 packages, but
> recieved none. B: none / none. They belong to the same workgroup:
> "ARBEITSGRUPPE". I can ping from A to A and from B to B. But not from A
> to B
> or B to A. They have different IP's and .

Possibly redundant, but if you are connecting these computers via local
IP only and do not have a router on the LAN, you want each computer to
have the other's IP address as its own router address.  zum Beispiel:

Computer A:
IP address:
Subnet mask:
Router address:

Computer B:
IP address:
Subnet mask:
Router address:

Normally, the router will have the xx.xx.xx.1 address, and all other
devices on the network will have addresses between xx.xx.xx.2 and
xx.xx.xx.254 (xx.xx.xx.255 is reserved for broadcast), but since there
is no router on this network, each computer has to know that it is
"routing" through the other computer directly.  This may also explain
why A is transmitting when you ping and B is not, since the .1 address
may cause A to assume it is a router for some purposes.  You might get
more consistent performance by assigning to A and to B, and changing the router addresses accordingly ..

Heard from a flight instructor:
"The only dumb question is the one you DID NOT ask, resulting in my
going out and having to identify your bits and pieces in the midst of
torn and twisted metal."

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