Q: I have two PCs sharing a Verizon DSL (1500/128) through seimens SS2604 router. However, my internet speed test on two PCs gave me huge difference. In a PC (Windows XP), I have about 1300k/170k the speed test and dslreport Verizon speed test, and real download speed was above 100K bytes / second. However, the other PC (Windows 2000 Pro), I could only 400k-600k on the speed test, and real download speed was about 40k bytes / second. No speed problem between two PCs, I can about 4-6MB / s, while the transfer of files between them. So, my question is what can be wrong for the PC with a slow Internet connection speed?
Thanks.
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Re:Jack,
Isn't the dafault MTU for XP 1500? (which is problematic for dsl connections) Just wondering….
Oops, nevermind. I've found that 1500 is the default for LAN while 576 is the default for Internet.
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Re:Yeah, if it was empty it was probably set to the 576 default.
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Re:Hi, Jack:
Followed your suggestion, and problem solved. Thanks a lot.
P.S. Do you think the MaxMTU was the problem? The old value was empty.
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Re:Download DrTCP: <a target=new class=ftalternatingbarlinklarge href="http://www.dslre
ports.com/front/DRTCP021.exe">http://www.dslreports.com/front/DRTCP021.exe</a>
Run the program, it will show the current settings of TCP/IP parameters. Write them down.
You can change any variable that you want, click Apply, and reboot the computer, if no good; you can always change to your original values.
Start with:
MaxMTU – 1492 for DSL
Tcp Receive – 255552
Window Scaling – Yes
Time Stamping – No
Selective Acks – Yes
Path MTU Discovery – Yes.
Black Hole – NO
Max Duplicate – 2
TTL – 64
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Re:are you sure the other comp with xp wasn't downloading or doing something to use up some of the bandwidth while the 2000 machine was testing? try plugging the dsl into only one computer at a time and test them then and see what happens.
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