Is RWIN something to screw with ???

[bxmag]

SpeedGuide.net TCP/IP Analyzer
TCP properties for IP = 24.188.97.141 ()
Note: Read the FAQ if the above is not your IP address.
Browser/OS = Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; Win 9x 4.90)

TCP options string = 020405b401010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1460, which is equal to MSS.

Default Receive Window (RWIN) = 17520
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 17520
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 700.8 kbps (87.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 280.32 kbps (35.04 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

MTU Discovery (RFC1191) = ON

Time to live left = 116 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000


I have tested my connection speeds on two different sites and both recommend adjusting RWIN, Is this worth the troble or leave it alone ??


thanks
Danny

 

[brianF]

I use there patches to update the registry settings for cable modem. Always increased performance as far as I have seen.
Yes increasing rwin will speed things up

TCP options string = 020405b40103030201010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1460, which is equal to MSS.

Default Receive Window (RWIN) = 256960
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 64240
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 10278.4 kbps (1284.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4111.36 kbps (513.92 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 53 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

 

[Davey7549]

Brian
Just tagging along and decided to do the tweaks since I have cable. When I went to set maxmtu=1500 this is what I found in the registry. Its not there should I be looking elsewhere?
Dave

 

[brianF]

No, just download and run the mtupatch for your os from the speedguide patch page. It will install the key
First time I did it I did it manually, big pain, now I just run the patches, works for me and everyone else I know that has used them.

 

[Davey7549]

Thanks Brian Saved allot of key strokes to add new keys.
All the settings were changed except MTU even though the key is set to 1500. That I believe is because I am hiding behind a Router. We will see what difference there is.
Thanks again guys!
Dave