Is RWIN something to screw with ???

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bxmag

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Joined
Aug 19, 2001
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76
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
 
Joined
Dec 2, 1999
Messages
12,041
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
 
Joined
Feb 28, 2001
Messages
11,584
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
 

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Joined
Dec 2, 1999
Messages
12,041
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.
 
Joined
Feb 28, 2001
Messages
11,584
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
 
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