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119 posts

Master Geek
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Topic # 12214 5-Mar-2007 12:19
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Hi All,

Hoping someone can help me with this problem.

I have a Desktop and a Laptop.
DSE ADSL XH1148 Modem connected to the Laptop.
Gigabit ethernet shared connection between the Laptop and the Desktop.

When I use Internet Connection Sharing I can get 4Mbps on the Desktop.
But on the laptop I can only get 2.5Mbps.

If I make the Desktop the host eg attach the ADSL Modem to the Desktop. I get the reverse.
Desktop 2.5Mbps the Laptop 4Mbps.

If I setup desktop as standalone with ADSL Modem I get 2.5Mbps.

All Speed tests done on http://ip.northnet.net.nz/meter/

Tried turning off the firewall still no joy.

How do I get 4Mbps in Standalone or on the Connection Sharing Host?
Any helpful suggestions appreciated.Cool


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6313 posts

Uber Geek
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  Reply # 62828 5-Mar-2007 12:25
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Purchase a router, or ADSL modem that has integral router. Sounds to me like you have found a limitation in the Microsoft ICS routine. You also may not have the correct MTU setting. When operating over PPPoA the defaults do not always give optimal results.

Cyril



119 posts

Master Geek
+1 received by user: 22
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  Reply # 62849 5-Mar-2007 14:41
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Thanks for the quick Reply Cyril 7Wink

Didn't have any joy playing with the MTU value

But Fixed it changing the
HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\GloabMaxTcpWindowSize = 62780 Decimal

Rebooted and now gettting 4.35Mbps

I also used this site

http://www.dslreports.com/tools

http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/regentry/58760.mspx?mfr=true

Apparently in VISTA the TcpWindowSize will be managed dynamically

GlobalMaxTcpWindowSize

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

Data type Range Default value

REG_DWORD

0x0–0x3FFFFFFF ( bytes )

(See description.)

Description

Determines the largest TCP receive window that the system offers. The receive window is the number of bytes a sender can transmit without receiving an acknowledgment. This entry takes precedence over TCP's negotiated maximum receive window size.

TCP uses a receive window that is four times the size of the maximum TCP segment size (MSS) negotiated during connection setup, up to a maximum size of 64 KB. TCP for Windows 2000 also supports windows scaling, as detailed in RFC 1323, TCP Extensions for High Performance. Scaling enables TCP to provide a receive window of up to 1 GB.

For Ethernet networks, the default value of this entry is 0x4470 (17,520, or 12 segments of 1,460 bytes each). For other networks, the default value is 0xFFFF (65,535), unless 0xFFFF is larger than each of the following:

Four times the maximum TCP data size on the network.

0x2000 (8,192), rounded up to an even multiple of the network TCP data size.

Note Image Note

This entry determines the default maximum receive window size for all interfaces. When configuring any particular interface, the value of the TcpWindowSize entry for that interface takes precedence over the value of this entry.

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

Related Entries

Page Image

TcpWindowSize


TcpWindowSize

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ interface-name

Data type Range Default value

REG_DWORD

0x0–0x3FFFFFFF ( bytes )

(See description.)

Description

Determines the largest TCP receive window that the system offers. The receive window is the number of bytes a sender can transmit without receiving an acknowledgment. This entry overrides TCP's negotiated maximum receive window size and replaces it with the value of this entry.

TCP uses a receive window that is four times the size of the maximum TCP segment size (MSS) negotiated during connection setup, up to a maximum size of 64 KB. TCP for Windows 2000 also supports windows scaling, as detailed in RFC 1323, TCP Extensions for High Performance. Scaling enables TCP to provide a receive window of up to 1 GB.

For Ethernet networks, the default value of this entry is 0x4470 (17,520, or 12 segments of 1,460 bytes each). For other networks, the default value is 0xFFFF (65,535) unless 0xFFFF is larger than:

Four times the maximum TCP data size on the network; and

0x2000 (8,192) rounded up to an even multiple of the network TCP data size.

Note Image Note

This entry determines the maximum receive window size for this interface. When configuring this interface, this entry takes precedence over the GlobalMaxTcpWindowSize entry, which establishes a maximum window size for all interfaces.

Windows 2000 automatically uses windows scaling if the value of this entry is greater than 64 KB. To disable windows scaling, set the value of the Tcp1323Opts entry to 0 or 2.

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

Related Entries

Page Image

GlobalMaxTcpWindowSize

 



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