Thanks. Unfortunately, I can't seem to find any way to direct the
router to ping the computers directly. However, it would seem to me
that the computers are communicating with the router since they can
resolve the IP addresses using just the computer's names in a ping
command. It's just that running the ping on the laptop against the
desktop fails after properly resolving the desktop's IP address.
I was just wishing I had a third computer to attach to the local net.
That would at least tell me if the problem is in the laptop which is
where I suspect it is. It's the only thing that's perhaps had "unknown"
configuration changes. The only changes to the desktop were the
uninstall of the old Brother laser printer and the installation of the
new one in its place. The printer works fine from the desktop where
it's physically installed.
Chuck Norcutt
On 7/31/2011 10:54 AM, Michael Collins wrote:
> On 7/31/11 10:19 AM, Chuck Norcutt wrote:
>
>> Turning the firewall off on both machines makes no difference to
>> anything. Trying to map drives elicits exactly the same similar but
>> different responses. Trying to ping from one to the other also has
>> exactly the same results.
>>
>> *I asked this yesterday I think. Is there perhaps a big clue in the
>> failure of the laptop to ping the desktop? Is this not LAN adapter to
>> LAN adapter via the router with no or at least minimal involvement of
>> the OS?*
>
> I'd say so, although the firewall can certainly get in the way of the
> "minimal involvement of the OS". The ability to ping the other machine is
> pretty fundamental at the TCP/IP level, and I think this is a significant
> clue. Whether it's the sending computer's ICMP packets not going out, the
> receiving computer not allowing them in or not sending the response out, or
> the sending computer not allowing the response in is unknown. IMHO you
> shouldn't be looking elsewhere until you resolve this.
>
> Can you ping them from your router? Some routers offer this feature. Or do
> you have another system on the LAN that you can ping to/from? Either would
> help you identify the likely culprit, though not the cause.
>
> Someone has suggest "sniffing" the LAN traffic, I think. The tool to use is
> Wireshark. I have it on several of my systems, but not on my XP laptop; I'll
> see if I can get it set up later today, if you're not already familiar with
> it.
>
> Michael
>
>
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