Tweaking my P00r Cable

Get help and discuss anything related to tweaking your internet connection, as well as the different tools and registry patches on the site. TCP Optimizer settings and Analyzer results should be posted here.
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Crusader
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Tweaking my P00r Cable

Post by Crusader »

Can Any1 advise help me on what are the best settings. I know u must get a ton of these questions thrown at you all the time, but spare a thought for those less fortunate than you (like me) on the lower end of broadband (UK :mad: ) with packages such as 512k/128k, currently the fastest available residential cable package :( :mad:

Anywayz this is what I got my registry set up as:

Default RcvWindow: 259072
Default Mss: 1472
Default TTL: 256
Black Hole: 0
Discovery: 1
SackOpts: 1
TCP1323Opts: 3

I remember being told ages ago, that due to my limited bandwidth (600k down - 72kb/s max, and 128k up - 16kb/s max) that my rcv window was too high and that i could use a low rcv window and no multiplier :confused: :confused:

Thx in advance for any help :eek: :D

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lance-tek
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Post by lance-tek »

go to Lobo's help page in my sig read up and we will go from there :)
A mistake does not become an error until one refuses to correct it

Folding for the future ;)
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EvilAjax
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Post by EvilAjax »

TCP1323Opts=0 and try a smaller RWIN for your connection. I don't know what your MTU is set at so I don't know which RWIN's would work for you. BTW, that is a false MSS... 1472?? Oh and set MaxDupAcks to 3. Take the TCP/IP Analyzer test from my sig and post your results so that I can see what your current settings are :)
<sarcastic>um... yeah</sarcastic>

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Crusader
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Post by Crusader »

MTU = 1500

bandwidth * delay product:
Your RcvWindow limits you to: 10362.88 kbps (1295.36 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4145.152 kbps (518.144 KBytes/s) @ 500ms

Will go to Lobo's page :)

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Lobo
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Post by Lobo »

Need to see all of test, thank you:
Please click in my signature where it says Test your tweak here, then:
At top where it says edit click and select, Select all,
Then go back to same edit button at top, click and select copy.
Come back to Speedguide, same thread you were on, in post reply box, with cursor blinking at begining of box go to top, edit, click, select paste, click, this will put information in box. Please X out your IP address, Thank you.
:) :)
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mista3style

NEED HELP FAST!!!!!

Post by mista3style »

im gettin a REALLY poor rate of bout 20-30 K a sec and want to pusah it up so it really fast! heres ma spexTCP 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) = 64240
RWIN Scaling (RFC1323) = 0 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)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)

bandwidth * delay product:
Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms

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

ANY HELP FOR MY POOR MODEM, ITS A MOTOROLA SURFBOARD!
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Lobo
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Post by Lobo »

Need OS and system specs please and do you have adjuster :) :)
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mista3style

Post by mista3style »

i use win 98 and i use cablenut adjuster! pentium 3 733mhz... with 128ram, need anything else? peace
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Lobo
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Post by Lobo »

Try these RWIN's (Default Rvc Window)
1 at a tine in box on adjuster inside 4.2 on desktop. GlobalmaxTcpWindowSize-BLANK
Save to registry at bottom and reboot each time you change value in adjuster
Check analyzer here at Speedguide to be sure you have RWIN in, thank you
Try: 513920, 522680 or 524176 :) :) :)
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Crusader
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Post by Crusader »

Grr, this is my thread, not urs, plz make ur own :(

=============================================
Browser/OS = Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)

TCP options string = 020405b4010303020101080a000000000000000001010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1448, which is less than MSS because of Timestamps, or other TCP/IP options used.

Default Receive Window (RWIN) = 259072
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 64768
For optimum performance, consider changing RWIN to 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: 10362.88 kbps (1295.36 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4145.152 kbps (518.144 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 244 hops
TTL value is ok.

Timestamps (RFC1323) = ON
Note: Timestamps add 12 bytes to the TCP header of each packet, reducing the space available for useful data.

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000
=====================================

O/S = win98se (win2k soon)

Sysytem- 1.33Ghz AMD @ 1.5Ghz, 512Mb ram, anythink else relevant? 3com 900B network card, and surfboard 3100 modem

Btw, Im not thick, theres no need to make a guide for dummies on c&p'ing the results from an analyser :)

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Lobo
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Post by Lobo »

Try RWIN's of 524176, 554800 or 57816:) :)
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Crusader
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Post by Crusader »

Keeping mtu @ 1500 and mss @ 1472? yea?

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Lobo
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Post by Lobo »

MTU 1500, MSS 1460 :) :)
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Crusader
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Post by Crusader »

Why 1460, when u can still ping with 1472? :confused:

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Lobo
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Post by Lobo »

See your test above, MSS 1460, Windows automattically sets it 40 below MTU, just put in RWIN please :)
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Crusader
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Post by Crusader »

Oh well, hasnt made much difference, never mind :(

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Crusader
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Post by Crusader »

Tho this has gone up :)

bandwidth * delay product:
Your RcvWindow limits you to: 22192 kbps (2774 KBytes/s) @ 200ms
Your RcvWindow limits you to: 8876.8 kbps (1109.6 KBytes/s) @ 500ms

Would it go up even higher with the highest value of rcwindow u mentioned? :2cool:

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Lobo
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Post by Lobo »

Sorry, with the pageage you have I don't think you are going to be able to get great speed, try 63888 as a RWIN :)
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Crusader
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Post by Crusader »

I thought the value was meant to be 64240 (44 x 1460) ?

Oh well, Ill try both :)

Btw, I saw somewhere that said that if u dont use timestamps, then u can fir more data onto each packet? If this possible for me to do??

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Lobo
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Post by Lobo »

Timestamps should be off, set to 1 :) :) :)
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