Natting with Windows 2000 Advanced Server

  • Thread starter Thread starter Alejandro Acosta
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Alejandro Acosta

Hello,
I hope you can help me in this case. We have a Windows 2000 Advanced
Server natting 10 PCs (to access Internet). The case is that when the people
open pages that have too many objects it's very slow, do you know why?. The
Server is very good server (Dell) with a lot of RAM and the PCs are also
very good. I'm pretty sure it is the server because when I take out it,
everything goes fine. I wonder if there is something to adjust in the
registry or something like that (I already adjusted the TCP window Size).

It looks that when there are too many TCP connections opened the server
degrades the performance.

Any idea/help is appreciated.

Thank you very much,

Alejandro,-
 
Alejandro Acosta said:
I hope you can help me in this case. We have a Windows 2000 Advanced
Server natting 10 PCs (to access Internet). The case is that when the people
open pages that have too many objects it's very slow, do you know why?. The
Server is very good server (Dell) with a lot of RAM and the PCs are also
very good. I'm pretty sure it is the server because when I take out it,
everything goes fine. I wonder if there is something to adjust in the
registry or something like that (I already adjusted the TCP window Size).

It looks that when there are too many TCP connections opened the server
degrades the performance.

Any idea/help is appreciated.

Thank you very much,

Alejandro,-
Click to expand...
On XP home or pro I'd guess it is TcpNumCnnnections, don't know if it
also applies to server versions.

SP2 sets that value to small to limit connections forced through DOS or
Syn-flood attacks.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip]
"TcpNumConnections"=dword:00000080

But there are more entries ;-)
http://support.microsoft.com/kb/314053/EN-US/

HTH
 
In said:
Alejandro Acosta said:
I hope you can help me in this case. We have a Windows 2000
Advanced Server natting 10 PCs (to access Internet). The case is
that when the people open pages that have too many objects it's
very slow, do you know why?. The Server is very good server (Dell)
with a lot of RAM and the PCs are also very good. I'm pretty sure
it is the server because when I take out it, everything goes fine.
I wonder if there is something to adjust in the registry or
something like that (I already adjusted the TCP window Size).
It looks that when there are too many TCP connections opened the
server degrades the performance.

Any idea/help is appreciated.
Click to expand...

On XP home or pro I'd guess it is TcpNumCnnnections, don't know
if it also applies to server versions.

SP2 sets that value to small to limit connections forced through
DOS or Syn-flood attacks.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip]
"TcpNumConnections"=dword:00000080

But there are more entries ;-)
http://support.microsoft.com/kb/314053/EN-US/
Click to expand...

Hi Mathias,
I don't have XP but IIRC the SP2 also altered the tcpis.sys driver to
limit the number of half-open connections to 10 with no registry
overide. I may be wrong. :)

OP,
I can't help but wonder why you don't use a hardware router/firewall
for the purpose (or maybe I'm missing something).
 
Mark said:
In said:
Alejandro Acosta said:
I hope you can help me in this case. We have a Windows 2000
Advanced Server natting 10 PCs (to access Internet). The case is
that when the people open pages that have too many objects it's
very slow, do you know why?. The Server is very good server (Dell)
with a lot of RAM and the PCs are also very good. I'm pretty sure
it is the server because when I take out it, everything goes fine.
I wonder if there is something to adjust in the registry or
something like that (I already adjusted the TCP window Size).
It looks that when there are too many TCP connections opened the
server degrades the performance.

Any idea/help is appreciated.
Click to expand...

On XP home or pro I'd guess it is TcpNumCnnnections, don't know
if it also applies to server versions.

SP2 sets that value to small to limit connections forced through
DOS or Syn-flood attacks.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip]
"TcpNumConnections"=dword:00000080

But there are more entries ;-)
http://support.microsoft.com/kb/314053/EN-US/
Click to expand...

Hi Mathias,
I don't have XP but IIRC the SP2 also altered the tcpis.sys driver to
limit the number of half-open connections to 10 with no registry
overide. I may be wrong. :)
Click to expand...
Since I have a hardware router I didn't install sp2 yet. I don't know
if the half-open connections are involved with natting.

For security reasons I'd prefer a seperate hardware also. (with prices
dropped to actual amounts it won't cut holes in your pockets ;-)
 
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