Newbie to Broadband

lowjk · Post by **lowjk** » Tue Jan 08, 2002 11:39 pm

Hi all,

I am a Singnet BB 256 user and have been tweaking my system via various links. During each tweaks, i have noticed differences in speed of uploads and downloads and that speeds various. At times my conections can hit as high as 30 000 cps and as low as 10 000cps. How can I stablised this? Using windows defaults setting, the connections stays stable around 20 000 cps ++. I hope you can advise me on what I can achieve with my 256 BB. Many Thanks .

This is the link I use to check my speed.
http://members.toast.net/leslie/testpage.htm

My System Specs are as follows:

Intel Pentium III 733 mhz
650 Mhz SDRAM
Windows 98 SE
IE 6 wt Outlook Express
Nvdia TNT 2 loaded with Dentonator XP drivers
Hdisk C: 20Gb
Hdisk d: 40Gb

lowjk · Post by **lowjk** » Tue Jan 08, 2002 11:42 pm

By the way this is the TCP/IP analyzer results :

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) = 255552
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 63888
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: 10222.08 kbps (1277.76 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4088.832 kbps (511.104 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 50 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

HenryHand1 · Post by **HenryHand1** » Wed Jan 09, 2002 12:07 am

Take a speed test at: http://www.speakeasy.net/popfaq (choose a location). Report back with the results in kbps.

Here's a quote from the page you were using...

The modem speed test pages are designed for, and tested on, ordinary analogue dial-up modems, and ISDN modems. Results of tests for other 'high speed' modems, such as, cable modems and xDSL modems, may be in-accurate.

Also...

What kind of connection do you have; Cable? DSL? and what are your ISP's capped speeds (the top speeds they advertise down and up)

lowjk · Post by **lowjk** » Wed Jan 09, 2002 12:12 am

hi HenryHand1,

My connections is Singnet Broadband Adsl 256/128kb

HenryHand1 · Post by **HenryHand1** » Wed Jan 09, 2002 12:25 am

Ouch.. those speeds suck

... tooo bad.

Anyway, here's what you should do...

1. Change your MTU to 1492 (if you use PPPoE; you use software and enter in a username and password to 'dial into' the internet. You probably do.)

2. Change your RWIN to 37752

If you don't use PPPoE, please tell me.

I can give you an even better RWIN number if you go to http://www.cable-modems.org/cgi-bin/cm/ ... netdiag.pl and scroll down to the "How Fast is my Connection?" section at the bottom.

It should look like this:

--- xxx.xx.xx.xxx ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 38.692/44.299/48.840/2.570 ms

The part I have in bold will be your latency. Post the result for that and I'll try to help.

lowjk · Post by **lowjk** » Wed Jan 09, 2002 12:29 am

Determining your ISP's MTU

The "MaxMTU" value you should use in the Windows 9x Registry is actually limited by your ISP's MTU value, since all packets will be traveling through their servers. To determine the MTU of your ISP, try the following:

In Dos Prompt, type
ping -f -l [packetsize] [http://www.yourisp.com]
where [packetsize] is the amount of data you want to send ( between 0 and 1500 ) and [http://www.yourisp.com] is your ISP's URL (you can also use your gateway, or any server your connection always passes through instead of your ISP's URL).

The largest value that does not give you the error "Packet needs to be fragmented, but DF set" will be your ISP's MTU - 28 (excluding the IP [20 bytes] and ICMP [8 bytes] header), depending on how the server is set. Use the following table to interpret the number you received and determine your ISPs MTU:

Largest non-fragmented value Your ISP's MTU (what you should use) Description
1472 1500 Used for Ethernet, 1472+28=1500
1468 1496 The Ethernet standard is actually 1496, although 1500 is widely used for simplicity
1464 1492 The largest possible MTU on PPPoE connections is 1492
548 576 576 is widely used for dial-up modems...
some other <number> either use 1500, the <number> you got, or <number>+28. you might want to check your Registry, your own MaxMTU setting could be the limiting factor if it is set too low.

Just did a test to the MTU and the results are 1472, do I keep to this setting or change to your recommended of 1492?????? Please advise

HenryHand1 · Post by **HenryHand1** » Wed Jan 09, 2002 12:43 am

lowjk · Post by **lowjk** » Wed Jan 09, 2002 1:10 am

HenryHand1

My new results are as follows:

TCP options string = 020405b40103030001010402

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) = 37752
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 37752
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: 1510.08 kbps (188.76 KBytes/s) @ 200ms
Your RcvWindow limits you to: 604.032 kbps (75.504 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 50 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

A drop of speed is experience but constat at 19 000 cps, by the way i do not know whether I am using PPPoe but I use software and enter in a username and password to 'dial into' the internet.

erogic1 · Post by **erogic1** » Wed Jan 09, 2002 9:58 am

if u have to enter a username and password each time u connect to the net...then u use PPPOE...so change the MTU to 1492...thats what i have it at...

lowjk · Post by **lowjk** » Wed Jan 09, 2002 10:50 am

HenryHand1

Sorry I did not post this http://www.speakeasy.net/popfaqat 1st coz I kind of slip your initial request. I did the test from west coast network- seattle and the downloaded was 189 kbps and upload was at 104 kbps. This results was from the adjusted tweaks:

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) = 255552
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 63888
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: 10222.08 kbps (1277.76 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4088.832 kbps (511.104 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 50 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

HenryHand1 · Post by **HenryHand1** » Wed Jan 09, 2002 4:33 pm

You still need to change your MTU to 1492. Otherwise the new settings are fine.

earthmofo · Post by **earthmofo** » Wed Jan 09, 2002 4:43 pm

He's not using PPPoE if he can send a packet size of 1472.

lowjk, keep MTU at 1500 and change RWIN value to 256960. RWIN should always be a multipule of MMS (MTU-40).

lowjk · Post by **lowjk** » Wed Jan 09, 2002 8:25 pm

Earthmofo,

According to my ISP, my connection to the internet is Singnet Broadband ADSL 256/128 kbps. I am using a SpeedStream 4060 modem and at initial, needed to type a user name and password before I can log on to the internet. So is my connnection PPPoE or normal? ok will change my MTU to 1500.

By the way, how can 1 change Mutliple RWIN to a multiple of MSS?

Lobo · Post by **Lobo** » Wed Jan 09, 2002 8:50 pm

You are PPPoE, go to Bobs for help on getting MTU to 1492:

http://www.carricksolutions.com/pppoe.htm

Find speed test site nearest you: http://www.testmyspeed.com/internationalspeedtests.htm

How do do speed test
1. The best time is early in the morning (3 AM - 6 AM)
2. Make sure defrag has been run so no files are fragmented
3. Delete Temp internet files, not while testing, but after each test. IE browser, click tools, internet options, click on delete files and no this will not harm system, just get rid of temp files
4. Go to a fast server such as http://www.happypuppy.com and click on 10 demos, select a LARGE file to download (not all of it , just most of it, before you click cancel) this will show you how fast you are downloading, it's not going to be quick except except early in morning when not many people on net. I recommend you go to http://www.analogX.com and download Net State live, run this while downloading as it will give you avg of your download speed, really all you need on Net Stat is incoming data, incoming totals and Local machine, right click on Net Stat anywhere, stactics and check these 3 items, the rest need not be checked unless you want them, all you care about is average. Another fast download site is ftp.lucasarts.com
Put system defrag in scheduled tasks to run everyday.
5. Probably the most important, nothing can be running during test, no firewalls, no virus stuff, no ICQ, no AIM (some of you may have to go into BIOS to disable virus scanner, nothing running except Net Stat live
Scheduled tasks will run disk defrag, 98 & SE in Taskbar, WIN ME in control panel
The people who want speed surfing or doing whatever must close all other programs.

Or if you wish you may go to http://www.testmyspeed.com and do one of the online tests, these vary to much for me but you may like them.