LAN Connection Issue

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Having issues with my broadband LAN connection, and even my ISP has
given up.  I’ve recently moved from Bell Sympatico to Rogers Hi-Speed –
I’ve never got my PC to work with the Rogers modem, but my fiancée’s Mac
works fine with the modem.  Here are the details:

•    PC is plugged directly into modem; there are no issues with limited
on no connectivity – it says the LAN is “connected”
•    ISP was able to detect connection, but could not explain lack of
Internet activity
•    ipconfig release and renew have done nothing – according to ISP, the
IP address is fine (ie. It is not starting with “169.254”
•    TCP/IP protocol set to obtain IP and DNS server addresses
•    I’m seeing very low packet volume received
•    Norton Firewall is disabled/Windows XP firewall is off as well
•    Network card is Broadcom 440x 10/100 Integrated Controller
•    Driver edition is
•    OS is Windows XP Home Edition Version 2002 Service Pack 2
•    Model: Dell Inspiron 6000

It is evident to me that something is blocking the connection – I’ve
had this happen to me before when I would try to use broadband wired
connections in various hotels.  Wireless connections always worked

My only alternative is to have the Geek Squad visit my home for $149.99
plus tax.  Would like to avoid this!

Many thanks,

Re: LAN Connection Issue

dvilimek wrote:
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As a rough diagnostic, you can try replacing individual elements in the
setup to see if you get an improvement:

1) Replace the operating system.  Boot from a LiveCD, like Ubuntu.  The
default network settings for that disc should automatically get an IP
address and DNS servers from your modem.

2) Replace cables.  A physical inspection of your cable is probably
worth making as well.

3) Replace the modem.  If that works, you won't definitively know if
it's a hardware fault or a configuration problem, but you'll have
isolated the component.

4) Replace/add a network card.  I've seen NIC cards, or onboard
controllers, crap out.  Maybe that's what's happening here.

Re: LAN Connection Issue

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Some modems will remember a network connection even when the PC is
disconnected, in this case the Mac. If you only have one IP address on your
account, this could be the issue.

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What DOES the IP address you get start with? I know that Motorola DOCSIS
modems give out a 192.x.x.x IP address when they don't have connectivity.

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This is most likely your problem. ANYTHING "Norton" installed in your PC is
a recipe for disaster. What's worse is that uninstalling it ususally buggers
stuff up even more!

What is the gateway IP address that your PC gets? Can you ping that?

Re: LAN Connection Issue

On Mon, 14 Jan 2008 18:56:48 -0600, dvilimek

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Ok, I ask a bit about this below just to clarify but
basically this just means a network connection is
established between the two but not much else.

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By connection they probably mean the modem, possibly a host
connected to it (though in my experience they usually mean
the modem)?

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Have you otherwise been able to use this network adapter to
connect to anything?  I mean the broadcom ethernet one
specifically not the wireless.

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Frankly, I would not troubleshoot this if I were you, I
would buy a wifi router as it not only provides wireless
access which is very desirable with a laptop, but it also
provides an extra layer of security over having a windows
system directly connected to the internet.  Granted wifi is
also a security risk in itself, but online networking
tutorials can show how to mitigate that risk, and if it
still seems too large a risk you could always connect the
systems using ethernet and disable the wireless feature of a
router.   It need not be an expensive router, a basic
802.11g can be found occasionally for as cheap as free to
$10-20 after a rebate.  Especially having multiple systems
on the premises it is a good piece of hardware to have.

If you are convinced to get a router, please let us know and
hold off on the following troubleshooting steps.  Instead
after having the router connected if you need to give your
ISP the MAC address of the router, or go to a special
webpage to register it (a CSR from your ISP can tell you
that, even if they say they don't support 3rd party routers
they should still be able to relay to you the most basic of
requirements their service depends upon, instead of just
telling you to insert some CD and run it which is not what
you need to do with a new router installation except if it
were only to uninstall some software they had already had
you install).  If you bought a router then after registering
it with the ISP if it didn't then work, the following listed
items would again be a method to resolve that issue.

First, check your laptop's power management application to
be sure the wired ethernet port is enabled/powered.  This
assumes you are connected by ethernet not USB (you are
leaving out a lot of info).

Next take a systematic approach to seeing where the
connectivity stops...  It will help a lot if you
systematically reply to each of these items, directly under
each item instead of a summary reply, to help us see where
your connectivity issue lies.

-  Are you able to network with other systems can can use
the internet through the modem?

-  Are there link lights between the (ethernet?) system
and/or modem and if so are they lit indicating a connection?

-  If you go to a command prompt (Start Button -> Run ->
(type) "cmd", then at the command prompt type "ping", hitting enter of course, does this work?

-  Next at the command prompt type "ipconfig /all"
What is the IP Address, subnet mask, default gateway, DHCP
server and DNS server numbers?

-  Next at command prompt type "ping (the IP address from
above)".  Does this work?

-  Does your LAN depend on DHCP IP address assignment?  If
you don't know the answer is likely "yes".  Is the gateway
IP # in the same range as your system's IP address?  Try
"ping (the default gateway's IP address)" at the command
prompt.  Does this work?

-  Are you familiar with accessing the modem's HTTP
interface?  Typically using a web browser and accessing
something like will do this.  You can
use google to research what the proper IP number is for your
modem, assuming yours does have this feature.  What make and
model is your modem?

-  Can you access the modem's *webpage* as mentioned above?
If so, what do the various screens state about connectivity?
Consult your modem manual also if necessary, what do any
LEDs on the modem show as to the connected status?

-  Did your ISP require you to register a MAC address when
you initiated service?  If so, was it the MAC address of the
modem only or a system connected to it, and if a system was
it the other system that does work with the modem?

-  The results of the above questions tend to make the rest
a shot in the dark, so more feedback on those may help but
at the command prompt can you get a response if you "ping"?  If not, next try "ping".  Does
that result in a reply or not?  That IP number is just one
system resolving to the domain name, having it
work but not would tend to mean a DNS server
related problem.

When the other system is connected to the modem and the
internet is working, also go to a command prompt and do
"ipconfig /all" and write down all the items asked about
above, the IP Address, subnet mask, default gateway, DHCP
server and DNS server numbers.  All the values should be the
same for both systems, except the IP address should have the
last number different.  For example if one were,
the other should be 192.168.0.(n).  Likewise these should
both be in the same range as the gateway IP number which is
also a 192.168.0.(n) number.  Likewise with the DHCP server
IP number, but the DNS IP numbers will be different, outside
of your LAN.

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