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5 Dial-Up Tweaks
1 kb/s = 1000 b/s
1 KB/s = 1024 B/s
1 KB/s = 8.192 kb/s
1 kb/s = .1221 KB/s
The lowercase b usually stands for bits while the uppercase B stands for bytes.
To find your theoretical download speed for your line, divide your advertised speed by 8.192:
53.333kbps / 8.192 = 6.51 KB/s
or by 10 to include overhead:
53.333kbps / 10 = 5.33 KB/s
Although many say an MTU of 1500 helps, I suggest using 576. If you're still wanting to make your MTU 1500, read the following steps.
1) Download Dr.TCP and change your MTU to 1500.
2) Click save then reboot your computer.
3) Dial-up like normal, then press Start>Run and type command.
4) In the command box, type
ping -f -l 1472 www.yourispswebsite.com
-l is a lowercase L, not a bar |
Simply change it back to 576 if it gives an error of "Packet needs to be fragmented but DF set." That error is telling you that your ISP doesn't support that MTU.
DSLR Speed Tests
PC Pitstop Download Bandwidth Test - 50KB/100KB/200KB/500KB/1,000KB/5,000KB Test Files
Speakeasy Network - Pick a city closest to you to get better accuracy.
How to find your RWIN:
1) Open up a DOS Prompt box:
2) Type: ping -l #### dslreports.com
#### is your MSS. (MSS = MTU - 40)
Take your average large packet ping, multiply by 1.5, multiply that by your proposed advertised speed, and divide that value by 8. You now have your raw RWIN.
Example: 450ms average latency (x 1.5) with 53Kbps available downstream bandwidth:
450 x 1.5 = 675. 675 x 53kbps = 35775. 35775/8 = 4472 (RWIN).
3) To change the RWIN:
If your line is already lossy, a higher RWIN from Windows default (ME/2K/XP: 17520, 9x: 8760), then it may cause packet loss.