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[Hard Harry]

Does the connection rate change? Or just the throughput?  If the connection rate changes, then its a duplexing issue. If its the throughput, I would look to the PPPoE connection. Maybe the MTU? Maybe some bottle neck with the PPPoE authentication itself. Could you try putting the router as just a static IP and set up PPPTP tunnel through router with your PPPoE user/PW?

[keenox]

What to you mean by throughput? The "real" speed?
In the previous post I was referring to the connection rate. I'm sure it's from the connection/hardware part now.
I tried using the router with Automatic IP and PPPoE Pass-through and I could connect from my PC (with user/pass) as with the direct connection, but the speed limit was there.

I'm going right now to the hardware store to buy some cat6 cable and see if it makes any difference. I got an email reply earlier from D-link support and the guy said it might be from the cable screening, but I think it's highly unlikely.

[Hard Harry]

Through put is the actual transfer rate of data from point A to B. Connection rate is something different. Just because you have a 100Mb connection rate, doesn't mean your transferring 100Mb from A to B, it just means thats the physical speed of the connection. There are lots of things that can cause low through put, but low connection rate is usually a hardware issue. I would start with the wires and see where that leads you.

[keenox]

Just got my FTP Cat6 cable. I just tested it and I can get 100mbps (con. rate) between my PC and router and not 1Gbps. It sucks because you can see that in the download speeds. I get ~75mbps on speedtest.net and 5-6MBps instead of 9-11MBps on torrents.
I think I'll just take an old computer, stick a Gigabit LAN adapter and a Wi-Fi card in it, install Linux and I have the best solution. Using routers seems to be too much of a hassle.

[FurryNutz]

Should have asked this before, is the PC and ISP Modem have GB supported ports?

[keenox]

@FurryNutz My PC has a Gigabit integrated LAN adapter (already posted here that I get 1Gbps connection between router and PC) and I also don't have a modem from my ISP. Please read my posts carefully. With direct PC connection I get 100mbps and with that I get ~97mbps on speedtest.net, so there's absolutely no problem neither with my PC nor my ISP connection.
I think the problem is with the H/W used in routers, maybe the ports are not properly powered, not powered at all, not filtered or not amplified properly.

[FurryNutz]

I apologize. Been a busy morning. 

[keenox]

I solved the problem. After lots of tests, I came to the conclusion that UTP Cat 5e cables are much better than FTP Cat 5e and even FTP Cat 6. I discovered this by noticing that using a 1m plain UTP Cat5e cable let me connect my laptop and PC at 1Gbps, while a 1m FTP Cat5e only let me connect at 100mbps (very strange). Then I bought 30m of plain UTP Cat 5e from the market, crimped it with plain (not shielded) RJ45 jacks and the problem is solved. I got 1Gbps with this cable between my PC and laptop and using it for the router WAN connection let me reach 95mbps speeds on speedtest.net again .
Seems that the foil is having a negative impact on the quality of the connection. So go with the plain old UTP Cat 5e. Cheaper and better.

[Hard Harry]

Yea, if your use shielded without grounded jacks, it turns the wire into a giant antenna.

[keenox]

The weird thing is that I used metallic jacks (with shielding) and at least the computer had grounding.

[FurryNutz]

http://en.wikipedia.org/wiki/Twisted_pair