[Fwd: Re: [AT] Help configuring AT with XP and Crossover Cable]

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-------- Original Message --------
Subject:        Re: [AT] Help configuring AT with XP and Crossover Cable
Date:   Sat, 19 Feb 2005 21:42:57 -0800
From:   Tim Hill <[email protected]>
To:     [email protected]
References:     <LISTSERV%[email protected]>



OK, you've got the PC NIC#2 and AT on the same subnet now, which is correct.

The gateway comes in when accessing the internet. Basically, the gateway
is the address that packets need to be sent to that are now destined for
the local subnet. it goes something like this...

1. Device or PC wishes to send data to a computer at another IP address.
2. Q: Is the destination on the same subnet (i.e. is the "network
number" of the destination the same as the sender network number)?
3. A: Yes: Just send the packet directly, since the computer is on my
subnet.
4. A: No. Send the packet to the gateway instead, and let it figure out
how to forward it to my desired destination.

So, in your case the AT can connect to your PC directly, but needs the
gateway to talk to the internet. Also note that, implied in the above,
is that the AT can talk to the gateway directly, which by definition
means the AT and the gateway must be in the same subnet.

So the gateway setting for the AT must be the same as the IP address of
NIC #2 on your PC. So far so good. You can ping the PC from the AT,
which is also good. Now you have three problems to solve...

1. Can the AT access the internet? This tests if the PC is correctly
acting as a gateway and forwarding packets for the AT. You can test this
by getting the AT to ping an internet address (you MUST do this by IP
address, not by name -- names come later). Find a webs ite you can ping
from your PC, note the IP address, and try it from the AT.

2. Can the AT resolve names? This is the DNS stuff. Once #1 is working,
you really should be able to simply use the same IP address as your PC
is using, since DNS requests are routable. But this won't work until
you've got the ping working in step #1.

3. Can you access shares on the PC? I'm assuming you can ping the PC
from the AT. If you cannot access shares, you should start checking the
network bindings on your PC. First, in Control Panel Networks, look at
the Properties for the NIC (#2) connected to the PC. You should see
"File and Print Sharing for Microsoft Networks" listed and checked. If
its not there, add it, since this is the component that listens for
share-level access over the network.

--Tim


Tim Carlson wrote:

>OK, here's where I'm at currently at:
>
>AT
>
>IP 192.168.0.76   (static)
>SM 255.255.255.0
>Gateway 192.168.0.1 (IP of NIC#2 on my PC)
>DNS 192.168.0.1
>
>PC (NIC#2)
>
>IP 192.168.0.1
>SM 255.255.255.0
>Gateway (blank)
>
>On the Network Connection settings for the NIC, called Local Area
>Connection 3, under the IP setttings, I have nothing entered for DNS
>entries, although I have tried entering the same values that my router
>has, which is attached to my other connection.
>
>John has recommended not entering anything for the Gateway or DNS on the
>AT. The web interface does not allow this, it complains"Audiotron IP
>Parameters Inconsistent Audiotron IP and Gateway on different subnets".
>But if I use the IP of NIC#3, 192.168.0.1 for both Gateway and DNS, then
>the AT finds the Internet but not my share. Using the panel on the AT to
>clear the Gateway to 0.0.0.0 and rebooting leaves the AT not finding the
>Internet. There doesn't seem to be a way to enter DNS from the panel.
>
>
>When I use the web interface to search for files, it returns \\TC-XP-
>HM\Audiotron error accessing share. The AT can ping TC-XP-HM just fine.
>
>I'm trying to get the AT off of the router, which is why I'm going through
>this exercise, but if I plug AT directly into my router, using DHCP, it's
>fat, dumb and happy, finding both the Internet and the share.
>
>I suspected something with XP firewall, but I get the same behavior even
>when it's disabled. I have Internet Connection Sharing enabled, which is
>how I was able to get the AT to see the Internet.
>
>I'm using XPSP2, and the AT is at 3.2.25.
>
>Thanks,
>
>Tim
>
>
>
>