The problem does sound like the router, since I think you said you had already
ruled out the firewalls. If you have a crossover cable or a passive hub you
might want to try a direct connection between the desktop and laptop. I also
don't recall if you tried the laptop's wifi interface.
-original message-
Subject: Re: [OM] (OT) XP Printer advice.
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: 07/31/2011 20:26
The router has been running for 4 years with the same configuration. It
has a firewall but the purpose of the firewall is to hide the LAN from
the WAN. It shouldn't be involved in this problem and in any case it's
configured the same as it always was (I just checked it again).
Chuck Norcutt
On 7/31/2011 7:26 PM, C.H.Ling wrote:
> I don't know if this help, my case was I had no problem to communicate
> between all computers (all XP SP3) but my movie box (wired) could not access
> the folder of other computers (it was able to connect to the internet). The
> problem was solved by disabled the "SPI Firewall Protection" in the router.
>
> At the mean time all computers are having their firewall turned on.
>
> For wireless connection there is also an AP Isolation feature on the router,
> this should be disabled if your laptop has to communicate with other
> computers connected to the same routers.
>
> C.H.Ling
>
> ----- Original Message -----
> From: "Chuck Norcutt"<chucknorcutt@xxxxxxxxxxxxxxxx>
> To: "Olympus Camera Discussion"<olympus@xxxxxxxxxxxxxxxxx>
> Sent: Sunday, July 31, 2011 11:58 PM
> Subject: Re: [OM] (OT) XP Printer advice.
>
>
>> 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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>
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