Re: Can see some sites, not others from Client PC.

On Sun, 12 Jun 2005 16:11:02 -0700, "AuntieFred"
<AuntieFred@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

> Hi Chuck,
> I did see the part about the MTU settings and did my best
>to 'fix' it by at first following Microsoft's instructions, and then another
>web page with more or less the same, however when it came to actually
>"Editing" inside the registry, the instructions were either unclear or in the
>other case, did not match with what I saw on screen. So not wanting my PC
>broke I wrote the above message.
> After posting I tried that Ping -f -i 1500 thing, and it DID say
>Defragment, however when I went lower @1470 it said "No connection" or
>something, so I wasn't sure I was on the right path.
>Then I remembered d/loading a bit of software last week while looking into
>this problem, but I was unsure how it worked or what to do with it
> I think it's called DrTCP or something.
> Anyway I couldn't see much on the webpage I got it from about how to run
>it, but had gleaned that the problem may be caused by too high a MTU
>(Whatever that is? I imagine its like packets of data) at the Client? PC (The
>one without direct internet conn) and on this Dr TCP it had a box with MTU at
>the side, so I thought "what the hell"
> So I ran it 1st on My Host PC and typed a value of 1500 in the MTU box and
>hit the button, hoping I hadn't screwed something up. Then on the Client woth
>a setting of 1470,and after I reset both PC's (Just about remembered!)
>Now all is fine, I have updated the PC at m/soft and downloaded MSN
>messenger (Could not connect to these before)
> Seems very strange how some sites would connect, but others not, but i'm
>just glad it's working.... Thanks for the help, you pointed me in the right
>direction :)
>
>
> And Thanks to DrTCP whoever you are... Auntie Fred

Auntie,

Well, the way it works is the smaller you set the MTU, the more chance that all
of your packets will go thru (less routers to reject sending a packet the
smaller it is), but the more packets you have to send to get the same amount of
data thru, which ultimately slows down your surfing. So it's a tuning issue.

The Microsoft article 319661 recommends 1490 for the ICS client, presumably for
the host using 1500 which is the normal for regular broadband. So I guess they
are thinking that ICS adds 10 bytes of overhead. If you see excessive slowdown,
you can bump it up to 1478 until you see excessive dropped packets again, but
you can't really predict when it will become critical. And of course just
because 1470 works today, that's no guarantee that it will forever or for all
websites you might ever access.

The problem affects some websites but not others when the problem is caused not
by the ICS overhead, but by a router between you and the problem websites. The
Microsoft article explains how to identify the problem (but it's real intense to
try to understand).
<http://support.microsoft.com/?id=314825>

Anyway, thanks for the feedback.

--
Cheers,
Chuck
http://nitecruzr.blogspot.com/
Paranoia is not a problem - it's a normal response from experience.
My email is AT DOT
actual address pchuck sonic net.
.