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analsying network problems

 
 
Fredo Vincentis
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      3rd Nov 2003
Can anybody advise me of any software I could use to analyse a slow network
connection on my LAN?

I have got three machines connected with each other via a router. Two of
them with the same platform (W2K), the same network cards, same setup and
the same cables. Then a third being a Macintosh.

Of the two PCs, one machine works fine and fast to talk to the Mac, the
other one is extremely slow to connect either to the Mac or the second PC. I
have tried everything: exchanged NICs, changed cables, changed PCI slots,...
nothing worked.

So perhaps network analysis software can help me?


 
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Sergey Y.
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      3rd Nov 2003
Look in this
Network Connections> Advanced > Advanced settings
Check Bindings and compare settings two PC.

--
Sergey Y.
MCSA 2000


"Fredo Vincentis" <(E-Mail Removed)> wrote in message
news:bo556d$go8$(E-Mail Removed)...
> Can anybody advise me of any software I could use to analyse a slow

network
> connection on my LAN?
>
> I have got three machines connected with each other via a router. Two of
> them with the same platform (W2K), the same network cards, same setup and
> the same cables. Then a third being a Macintosh.
>
> Of the two PCs, one machine works fine and fast to talk to the Mac, the
> other one is extremely slow to connect either to the Mac or the second PC.

I
> have tried everything: exchanged NICs, changed cables, changed PCI

slots,...
> nothing worked.
>
> So perhaps network analysis software can help me?
>
>



 
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Herb Martin
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      3rd Nov 2003
> Can anybody advise me of any software I could use to analyse a slow
network
> connection on my LAN?


On Win2000 SERVER (or with SMS which you likely don't have) you can use
the built-in NetMon (with some limitations)

On any Win2000 systems you can get some network information by using
Performance Monitor (SysMon snap-in).

You can (search the Internet &) download the free WinDump, Ethereal,
or Packetizer.

> I have got three machines connected with each other via a router. Two of
> them with the same platform (W2K), the same network cards, same setup and
> the same cables. Then a third being a Macintosh.


Consider replacing the cables if you have unexplained SLOW network.

> Of the two PCs, one machine works fine and fast to talk to the Mac, the
> other one is extremely slow to connect either to the Mac or the second PC.

I
> have tried everything: exchanged NICs, changed cables, changed PCI

slots,...
> nothing worked.
>
> So perhaps network analysis software can help me?


Perhaps but probably not. Chances are you have a name resolution or cable
problem.

You say, "slow to connect"? Is it normal after that connect? This is
almost
always a NAME resolution problem.

What sort of connection are you making? How are you resolving names?


--
Herb Martin


 
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Chuck
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      3rd Nov 2003
On Mon, 3 Nov 2003 19:56:13 +1100, "Fredo Vincentis"
<(E-Mail Removed)> wrote:

>Can anybody advise me of any software I could use to analyse a slow network
>connection on my LAN?
>
>I have got three machines connected with each other via a router. Two of
>them with the same platform (W2K), the same network cards, same setup and
>the same cables. Then a third being a Macintosh.
>
>Of the two PCs, one machine works fine and fast to talk to the Mac, the
>other one is extremely slow to connect either to the Mac or the second PC. I
>have tried everything: exchanged NICs, changed cables, changed PCI slots,...
>nothing worked.
>
>So perhaps network analysis software can help me?


If you're convinced the problem is caused by the network, Ethereal at
http://www.ethereal.com is a good start.

But consider some other causes also. I'd start with a malware check.
Spybot S&D and HijackThis are both free. You can get help at
SpywareInfo Forums:
http://forums.spywareinfo.com/index.php?showtopic=5187

Also, how about a pc health check? Try PCPitStop, which will check
numerous items in your system that could result in poor network
performance:
http://www.pcpitstop.com/default.asp

Cheers,

Chuck
I hate spam - PLEASE get rid of the spam before emailing me!
Paranoia comes from experience - and is not necessarily a bad thing.
 
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Fredo Vincentis
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      6th Nov 2003
"Herb Martin" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> > Can anybody advise me of any software I could use to analyse a slow

> network
> > connection on my LAN?
> > I have got three machines connected with each other via a router. Two of
> > them with the same platform (W2K), the same network cards, same setup

and
> > the same cables. Then a third being a Macintosh.
> > Of the two PCs, one machine works fine and fast to talk to the Mac, the
> > other one is extremely slow to connect either to the Mac or the second

PC.
> > I
> > have tried everything: exchanged NICs, changed cables, changed PCI

> slots,...
> > nothing worked.


> You say, "slow to connect"? Is it normal after that connect? This is
> almost
> always a NAME resolution problem.


Sorry, I meant it is always slow. In fact, if I go to Network Connections it
sees the other computers very quickly. But if I click on any files or
folders of the other computer, it takes ages just to highlight them. Then I
try to copy a file from the other computer and it takes about 3 Minutes for
a 5MB file.

So seeing the other computer in the Network is no problem. But copying
files, reading files, writing to files, etc is all extremely slow.


 
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Herb Martin
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      7th Nov 2003
> Sorry, I meant it is always slow. In fact, if I go to Network Connections
it
> sees the other computers very quickly. But if I click on any files or


Network Connection makes NO connection initially so this can still be
a name resolution issue if connection to specific machines is slow.

> folders of the other computer, it takes ages just to highlight them. Then

I
> try to copy a file from the other computer and it takes about 3 Minutes

for
> a 5MB file.


Slow file transfer does NOT imply name resolution problems usually -- it
might
involve a BAD network or especially a BAD DROP CABLE.

Check/replace your cables -- they are cheap and cause problems far more than
most people realize.

> So seeing the other computer in the Network is no problem. But copying
> files, reading files, writing to files, etc is all extremely slow.


"Seeing" is about Browsers, not connections usually.

--
Herb Martin


 
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Fredo Vincentis
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      7th Nov 2003
"Herb Martin" <(E-Mail Removed)> wrote in message
news:#(E-Mail Removed)...
> > Sorry, I meant it is always slow. In fact, if I go to Network

Connections
> it
> > sees the other computers very quickly. But if I click on any files or

>
> Network Connection makes NO connection initially so this can still be
> a name resolution issue if connection to specific machines is slow.
>
> > folders of the other computer, it takes ages just to highlight them.

Then
> I
> > try to copy a file from the other computer and it takes about 3 Minutes

> for
> > a 5MB file.

>
> Slow file transfer does NOT imply name resolution problems usually -- it
> might
> involve a BAD network or especially a BAD DROP CABLE.


But I used the exact same cable with an older machine (Win98) just a week
ago. I have also tried another cable that I have got (though it is the same
brand as the one currently used).


 
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Herb Martin
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      7th Nov 2003
> But I used the exact same cable with an older machine (Win98) just a week
> ago. I have also tried another cable that I have got (though it is the

same
> brand as the one currently used).


Then put a network monitor on the line and figure out WHAT it is doing.

NetMon (WinNT 4.0 Server+), SMS NetMon, or Free Ethereal or WinDump.

Cabling, bad NICs (less likely), or bad hubs are still a strong possibility
if it is
slow AFTER the name resolution.

Also consider using PerfMon\SysMon to determine where the machines are
spending
their time (CPU, Disk, Net, etc.)

--
Herb Martin


 
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