[MLB-WIRELESS] [OT] Vista desktop can no longer connect to Internet via Netgear CGD24N cable gateway

Denis Cheong denis at denisandyuki.net
Sat Oct 29 10:17:21 EST 2011

My thoughts ...

1. Delete ALL NICs from Vista, reboot and allow them to be re-detected from

2. Uninstall all NIC drivers from Vista, and install only the original ones
you want (having conflicting drivers installed can be an issue because you
don't know which ones it's using)

3. Ensuring that when you set a static IP address you also set a default

4. When you have a static IP address, doing a tracert to see where packets
are dropping out.  Also ping other machines on the same subnet.

5. On the Mikrotik (or another linux machine), in the same layer 2 network,
doing a Torch (or tcpdump) to see if any packets are getting onto the
network from the PC (DHCP specifically)

6. Replacing the patch / flylead cables, or connecting with a separate cable
directly to the switch

7. Doing a cable fault test on the switch (if it has one) or on the NIC (if
it has it)

If the PC can get a lease from the RB but not the cable modem, this says to
me that in reconfiguring the physical layout you eliminated the point of
failure (most likely one of the cables), i.e.

   - Did you patch the PC directly into the RB with a different patch lead?
   - Was the RB using the PC's old network cable to get to the switch?
   - The 532 is only 10/100 - was the Acer previously running gigabit to the
   switch?  If so by putting the 532 in between you have just dropped out two
   of the pairs on the ethernet cable, one of which could be faulty, and would
   explain why the 532 eliminates the issue - try dropping the NIC back to
   100mbit if you can't test the cable.


On Sat, Oct 29, 2011 at 12:29 AM, Michael Borthwick
<holden at netspace.net.au>wrote:

> On 27/10/2011, at 7:44 PM, Daniel Carosone wrote:
> > Weird. Next check is to confirm it is the mac address: change the RB
> > to use the PC's mac address and see if it still gets a lease
> >
> > --
> > Dan.
> >
> The RB can get a lease when it has the same MAC address as the PC.
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