Rwin settings for win2k and high speed internet. Registry settings.

[Thor_Sevan]

Hi, according to dslreports.com,the link into the win2k registry to modify rwin settings is:[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"TcpWindowSize"

But I can't find the "TcpWindowSize" line. I have SP2 installed. Maybe it changed the path. Someone knows where we change it?

Thanks

Thor.

 

[mboy]

Donwload the latest verwsion of this:
http://www.dslreports.com/front/drtcp.html

It is a GUI that will allow you to adjust various things in order to improve your broadband 🙂

 

[Thor_Sevan]

I have that version.
Is it normal that the first time I run the program I have a blank space for rwin AND for MTU ?
This means that the program wasn't able to read these values in the registry right ?
Cause with blank spaces, I can't know what are my DEFAULT values. If I change to new ones, I will NOT be able to go back to initial values. 😉

And no, I don't want to backup my 30 mb registry and then copy it back. I prefer to know where exactly are stored these values ! hehe 🙂

Thor !

 

[John]

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]

You need to add a new dword value TcpWindowSize and make it 256960

or

You can get a reg patch from speedguide.net that does it for you, as well as adding additional enhancements.

 

[sharkeeper]

This may help.

Cheers!

 

[Thor_Sevan]

TCP options string = 020405ac01010402

MTU = 1492
MTU seems to be optimized for PPPoE... If you are not on a PPPoE connection, consider increasing your MTU to 1500 for optimal throughput.

MSS = 1452
Maximum useful data in each packet = 1452, which is equal to MSS.
MSS is optimized for PPPoE. If you are not on a PPPoE connection, consider increasing your MTU value.

Default Receive Window (RWIN) = 17424
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 17424
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
511104 (MSS x 44 * scale factor of 8)
255552 (MSS x 44 * scale factor of 4)
127776 (MSS x 44 * scale factor of 2)
63888 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 696.96 kbps (87.12 KBytes/s) @ 200ms
Your RcvWindow limits you to: 278.784 kbps (34.848 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

MTU Discovery (RFC1191) = ON

Time to live left = 113 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000


Woua. Interresting, should I change my rwin to 511104 ? How do I set the scale factor ?

Thanks a lot !!

Thor !