Stumped with network issue

G

Guest

Get ready... this is a long one. I see there are quite a few other postings
with similar issues. I REALLY hope someone here can help me out with this.
Here goes the story:

One of the people here had a Mac G3 that died. I decided to replace it with
a PC, as that was the only thing I had laying around here. The PC is a
Pentium II, 400 MHz processor w/10GB hard drive (yes, it’s an old computer,
but it’s only needed to surf the web and check email), Windows XP Pro
installed, Network card installed

I set up the computer in my office. (Performed a clean install of XP Pro.)
I then added the network card. It was found and installed without problems.
I then downloaded all the necessary patches via a cat 5 connection that I
pulled from my PC to temporarily use on the new one. The new computer has
its own static IP address (which was the one used on the Mac that was
previously in this person’s office). I was able to access the
Internet/network without any problems.

Then I moved the computer to the new office and hooked it up to the cat 5
cable there (the one that the Mac G3 used to access our router (the internet)
without any problems). The PC could not access the Internet or any of the
other computers in the workgroup. I changed nothing when I moved the
computer – just plugged it into another part of our network in another
building.

So, I started trying to ping things. The “new†computer is connected to a
hub in one building. There is also a Mac on that hub. I was able to ping
the Mac from the new PC. I could not ping the router from the new PC. I
then went to the Mac. I was able to ping the router from the Mac, but could
not ping the new PC. I went to “my†PC in another building. I was able to
ping the Mac and the router from my PC, but could not ping the new PC.
Hmmmm… Maybe something with the cable (it was pretty long going from the hub
into the other office (150 ft or so). Rather than running another cable
through the entire building, I physically moved the new PC into the room with
the Mac and plugged it into the hub via a shorter cable. Same problem. I
then plugged my laptop into that same shorter cable. Accessed the network
fine. Took the laptop to the room 150 ft away, plugged in the long,
questionable cable, still accessed the network fine. Was able to ping the
Mac and the router from both cables in that building from which the new PC
was not able to connect/ping. IP problem? Took the laptop off the network,
changed the IP address on the new PC to the laptop’s IP, same problems. Took
the new PC back to my office for further thought.

When I got it back to my office, plugged new PC back into cat 5 cable,
Internet/router access worked fine. Thought about it, and then tried to ping
the Mac in the other building. Couldn’t ping it. (I hadn’t tried pinging
anything over there before because, when I first set it up, it appeared as
though everything was working ok – no Internet access trouble.) Moved the
cable back to my PC. My PC COULD ping the Mac. Hmmmm… Perhaps something is
screwy with the network card in the new PC (I got it new from our Supply).
So, I took out the network card, and installed a USB Ethernet adapter
instead. It installed fine, and was able to access the Internet/router
without problems, AND it COULD ping the Mac. Great, perhaps the problem was
the network card. I took the computer back over to the other office, plugged
in the long cat 5 cable, NO Internet ACCESS. I could, however, still ping
the Mac and NOW the Mac could ping the new PC. Went to my PC and was able to
ping the Mac and the new PC in the other building. I don’t understand.

It appears as though the new PC cannot get outside of the building in which
it is located. Every other system gets out of the building fine. As I’ve
switched out the network cards, I’m at a loss for what else I can do. A
co-worker booted the PC from an Opix CD (Unix). Even running Unix, we cannot
ping the router, so it appears to be some type of hardware issue. Does
anyone know what the problem could be?

Thanks
jewels
 
G

Guest

You LAN might not be authenticating the MAC address of your card. If you are
not using a DHCP network, everything else might have to be configured
manually, too. Talk to your network administrator.
 
G

Guest

Hi Fish-

Unfortunately, I am the network administrator. I thought it might be the
MAC address, so that's why I tried a different method (the USB ethernet
adapter). I removed the network card and tried the USB. Still didn't work.
Is there a way to make sure that the network configuration associated with
the previous LAN card has been completely wiped out from the system? When I
installed the USB connection, I did get a message about another network card
previously using that IP, and that there may be a conflict if the card was
re-activated, but I proceeded anyway. The old card had been removed
physically from the system.

Any other suggestions?

Also, I do have the Firewall disabled.
 

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