03-09-2009
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Re: Need Help. problem connecting to some sites, other sites very
Recreating the LAN connection is unlikely to fix anything unless you had
previously adjusted settings specific to your network card.
Have you at any time in the past on this PC adjusted any settings related to
MTU or Checksum Offload? Both of these are often cited as ways of improving
performance, but with the wrong settings can actually cause more problems.
Disabling Checksum Offload is worth a try if you haven't already done so
(not all network chipsets have this, but on the few PCs I've had the
experience of tinkering with turning this off was a vast improvement with
connection stability). What this setting does is to use the network chipset
hardware to calculate packet checksums, and some of these chipsets actually
get the calcs wrong forcing the network layer to have to retry repeatedly
until packets can be sent correctly.
For MTU you would need to ensure that your MTU setting is reverted to the
Windows default or set to a value matching the router - it's possible that
this may have been adjusted to match the modem so it performs fine when
corrected directly, but the router may have a different setting and while it
can negotiate changes to this to send to the router having your PC send in
mismatched packet sizes could be causing the router to ignore those packets
or respond in a way to get your network driver to adjust it's size, and if
the driver is buggy this might well be happening on every packet instead of
the first ones to be sent to the router.
Dan
richquick wrote on Sun, 8 Mar 2009 15:13:01 -0700:
> Computer A & B are coneected via ethernet. Computer C&D are wireless.
> B, C, & D connect and surf with no problems. Computer A has no
> problems surfing the internet when it is connected directly to the
> modem. Computer has an obvious problem when it is connected to the
> router. I changed the ethernet cable. I think it has to do with the
> configuration of the LAN connection properties and some conflict with
> the router.
> I have tried many combinations of things to change the LAN connectin
> proerties but nothing is working. Is there any way to delete the the
> LAN connection and create a new one?
> "Leonard Grey" wrote:
>> If computers "A" "B" and "C" are all attached to the router by a
>> wireless connection, and only computer "A" has slow browsing: If
>> clearing TIF on computer "A" does not restore web browsing to its
>> typical speed there are many possible causes, among them:
>> 1- Computer "A" has been hacked.
>> 2- Software installed on Computer "A" - typically some flavor of
>> security software - is interfering.
>> ---
>> Leonard Grey
>> Errare humanum est
>> richquick wrote:
>>> I use IE7 going through a router to the internet. About 1 week ago
>>> IE was not opening some websites at all and others would take a
>>> very long time to open (more than a minute).
>>> I hooked up my computer directly to my cable modem and everyhting
>>> worked great. When I go through the router I have my problem .
>>> There is one other computer that is wired to the router and they
>>> work fine.
>>> I have 2 laptops that connect to the internet with WIFI through the
>>> router and they don't have a problem. Only my computer that is
>>> running XP Pro SP3.
>>> I have looked at all settings and I can't see anything wrong.
>>> Before I reload windows XP or install Vista in hopes that the
>>> problme would go away I am looking for some help from the community
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