Greetings...looking for Cablenut Settings for the faster Roadrunner

[Mazakman]

We have the 3000/384 Roadrunner speeds here now and I am wondering about what I should change in the Cablenut settings for the increased download speeds. Been running the following values with pretty decent results (even with the new speed) Testing at 2930 kbps down at Speakeasy NY site.

384000
65536
1
200
480
640
819200
64000
150400
0
12800
32
4096
1
1
0
37960
8000
16384
5000000
1
1
0
1
3
100
80
1460
1460
30
0
37960
20
10
64
0
6
240


Thanks !

[mnosteele52]

Your settings are perfect, your getting almost 100% of your caps, you aren't going to get anymore speed.

[Mazakman]

Thank you sir. I just did not know if any of the settings needed to be changed or not. At every nearby Speakeasy site, I am seeing 2900 to 2940 kbps down and up to 365 kbps up. I am a happy Roadrunner customer now.

[j79zlr]

you might to change your DefaultSendWindow (2nd setting) to 49152

Won't really make much difference though, your speeds are awesome.

[CaptainSpeleo]

I was also going to ask if 49152 for DefaultSendWindow would be the correct value (384/8 x 1024) instead of 65536.

Also, would 64240 or higher be a more appropriate value for GlobalMaxTcpWindowSize and TcpWindowSize instead of 37960?


Frank's Windows 95/98 Tips

[mnosteele52]

Originally posted by CaptainSpeleo
I was also going to ask if 49152 for DefaultSendWindow would be the correct value (384/8 x 1024) instead of 65536.

Also, would 64240 or higher be a more appropriate value for GlobalMaxTcpWindowSize and TcpWindowSize instead of 37960?


Frank's Windows 95/98 Tips

Yes his DefaultSendWindow should be a bit lower bit it won't really change anything. As for his TcpWindowSize, that depends on his latency. With his caps of 3000 and if his latency was 100ms then that is the proper value. My caps are 3000 and my max latency is 100ms and that is the value I use.

[Mazakman]

Hi guys, I lowered the DefaultSendWindow to 49152 and kept 37960 for the TCP Window Size. Just tested at Speakeasy NY and got 2930 and 360 . Downloaded the Roadrunner test file (50 megs) from the Rochester RR site in 2:21. I think that I am going to leave everything just where it is now. I may try 64240 for a bit and see if there is any noticeable difference. I am just happy that RR has raised the cap to 3000 kbps. BTW...they raised the limit in the old wave modems today in Rochester, so anyone with an old Motorola is now seeing the new speeds too !

[mccoffee]

Try the perfect rwin if you haven't already.


The following information is what you need to know before you can find your perfect RWIN:

1. Your ISPs download caps in kilobits per second.

2. Your maximum latency, to find yours read herehttp://dslnuts.com/ping.shtml.

3. Your MSS, do a TCP/IP Analyzer test to find yours. Remember your MSS is always 40 less than your MTU.

Once you have the above information all you need to do is input it into the following formula: (This is an example of mine)

TcpReceiveWindow (RWIN) Formula

(Maximum Bandwidth x Maximum Anticipated Latency) / 8

Example of my connection with a 3000 download cap with a maximum latency of 100 ms:

(3000 x 100) / 8 = 37500 To make it a multiple of MSS divide by 1460:

37500 / 1460 = 25.68 Then round up to the nearest even whole number:

26 x 1460 = 37960 - my RWIN


If you would like an easy way to find your optimum settings in CableNut try the "CableNut Live" webpage. (A BIG thanks to our member here j79zlr for this)

[CaptainSpeleo]

Hi, Mnosteele:

Sorry for the long delay in replying. My wife and I have been out of town for a few days.

You mentioned recently about using a latency of 200 for Roadrunner cable, which is what I was going by.

No big deal. Your advice has always worked good for me.


Frank's Windows 95/98 Tips