Looking for help with a problem - basically, I am getting about 1450 from a 4000 cable connection. But only on wired ethernet - when I connect wireless I get a faster speed. This is from multiple computers - and there is a speed difference from the same computer (notebook) depending on the connection type. Very weird problem that I have not been able to resolve. Here is a paste from another forum that details what I am experiencing and my troubleshooting steps:
Still working on it. Let me recap:
I use ZoneAlarm and Norton Antivirus - no change when disabled - haven't uninstalled for obvious reasons.
I have a D-Link DI624 and an old 3Com 'sharkfin' modem.
I have borrowed a LinkSys BEFSR11 for testing - no difference wired, wireless unavailable.
I have been testing with 4 computers:
2 wired - both with XP SP2 - one Athlon XP 2500+ Barton and one Athlon64 3500+. 2 notebooks - one XP SP2 and one 2000 Professional. The XP notebook has wired and G - the 2000 notebook has wired and B. I also brought an old 98SE notebook into the testing with wired and G - won't go into that other than to say it really didn't make any difference.
All computers get about 1450 on the wired connections.
The G notebook gets about 2400 on the wireless connection.
The B notebook gets about 3400 on the wireless connection.
Again, the notebooks get about 1450 on the wired connections.
Also, connecting the wired desktop directly to the modem gets me about 2200.
I have been using the speakeasy test from Atlanta - but I have confirmed on actual downloads that there is a real speed difference.
I have tried changing one wired desktop to the RWIN and MTU settings that the fastest notebook had with limited success - got up to 2200. Casual browsing and repeated speed test give me reason to believe that it is not as stable as before.
Most optmizers I have tried seem to believe that my settings are correct and should work well.
So - bottom line - the faster my computers connection to the router is, the slower the speed. It is predictable and infinitely repeatable. Obviously, the different connections are using different parameters and that is definitely making a difference. But I don't believe adjusting these settings is the way to solve the problem. This discrepancy is not the problem, but the symptom of the problem. Rather than forcing my wired connections to work around the issue, I need to find out what is causing it. Since I have tried two different routers with the same result, I don't think it is the router or the switch built into the router. I can really only suspect the modem at this point. Or, my line is just bad enough that I'm limited on what I can push through it at the moment. However, I do not seem to be dropping any packets during testing. I would think if larger packets were causing the problem I would see some retransmits of dropped packets.
So, I'm pretty much stuck at this point. Any thoughts or dialog would be appreciated. Please though - no tweak your settings suggestions. I think that is a symptom of the problem, not the problem itself. I don't think I should really have to do that if the router, modem, and line are OK. One obviously isn't.
I haven't had much luck at the other forum. I have used some tools from this site but nothing has really helped.