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[Svuppe]

If the 857 is exhibiting the same condition, I would presume that the problem lies elsewhere, up stream or down stream from the routers.

What ISP Modem make and model do you have?

I agree that it looks like something elsewhere. Or something elsewhere in combination with newer D-Link routers. I have speed problems with the DIR-865L and DIR-857. But no problems with my current DIR-855 or a 655 (just tested).

I can't answer the ISP modem make and model, because I don't have any.
The entire block (about 250 apartments) has fiber from the ISP going into some big switches (and I don't know what make they are). From there each apartment gets a 100 Mbit lan cable.

I have tried the suggestions, but with no improvements.

[FurryNutz]

Hmm, could be a possible issue between these new gen routers and your ISP services there.

Any chance you know of someone living in a house and not a apt complex that has broadband internet using a ISP modem, stand alone modem preferred, that you could take these routers to and test? Would be one other way to see how these routers work off your current ISP service situation.

[Svuppe]

I may be able to take it to a friend some day. I will definately try that when I am able to.
In the meantime, I have made some tests, while logging the traffic on both sides of the router. I am still digging into the logfiles, but I did find the equipment that is at the other end of my wan cable, as it announecd itself to the router.
It is a Cisco WS-C2950G-48-EI.

[Lexist2112]

If the 857 is exhibiting the same condition, I would presume that the problem lies elsewhere, up stream or down stream from the routers.

What ISP Modem make and model do you have?

I would factory reset the router(s), set up WiFi SSID info, Ensure Traffic Shaping or Transmission Control is enabled using default settings. Select the UP and Down speeds for Transmission Control. Enable QoS however you shouldn't need to set any rules up. Save settings and reboot the router(s).

Turn off all anti virus and firewall programs on PC while testing. 3rd party firewalls are not generally needed when using routers as they are effective on blocking malicious inbound traffic.
Turn off all devices accept for one wired PC while testing.

Run some speed tests from various sites:
http://forums.dlink.com/index.php?topic=48352.0

Agreed.

In addition, it might make a difference,  there are default QOS rules without any info in the priority, protocol and IP range. Uncheck ALL of those. Save your info and try again.

I agree with Furry that if you having the same issue with the 857, than quite possibly there maybe firewalls that may have become active. If your using Windows, you can uncheck the firewall, and let the router do all the firewall responsibility.

Let us know

[FurryNutz]

Thats a switch:
http://www.cisco.com/en/US/products/hw/switches/ps628/ps3821/index.html

I see it's no longer in production as well. 

I may be able to take it to a friend some day. I will definately try that when I am able to.
In the meantime, I have made some tests, while logging the traffic on both sides of the router. I am still digging into the logfiles, but I did find the equipment that is at the other end of my wan cable, as it announecd itself to the router.
It is a Cisco WS-C2950G-48-EI.

[FurryNutz]

Do you get a public IP address from this connection? I presume you do?

[Svuppe]

Yes, I get my public (and static) IP from it.

[FurryNutz]

Ok, Something I think you can test out, would involve putting the 855 back online.
I'm thinking of having you do the following to both routers:
Turning a router into an AP.

Put the IP address you give to the routers into the DMZ on the 855 so that theres not 855 router processing anything coming and going thru the 855. Straight shot between the new 8 Series routers and the ISP service thru the 855.

Test the speed before putting the new routers on line with the 855. I presume the test should be good here. Once you get the new 8 series router(s) configured for wired AP and connected to the 855, wire 1 LAN pc to the back of the AP router, don't test wireless. Speed test to see what the results are.

About the only thing I can think of that you can do right now until you can take these 2 routers to a different location where there is a stand alone ISP modem to connect them to.

[Svuppe]

Put the IP address you give to the routers into the DMZ on the 855 so that theres not 855 router processing anything coming and going thru the 855. Straight shot between the new 8 Series routers and the ISP service thru the 855.
Test the speed before putting the new routers on line with the 855. I presume the test should be good here. Once you get the new 8 series router(s) configured for wired AP and connected to the 855, wire 1 LAN pc to the back of the AP router, don't test wireless. Speed test to see what the results are.

That test sounds almost as the test I did earlier.
I had the 855 as the first router (to my ISP), and then the 865 as another router on my LAN. I didn't reconfigure it to be an AP, but having two real routers, each doing NAT translation (yes, I used different address ranges on the two routers). Here I got full speed through both routers.

I can do the AP test, but in light of the other test, I don't think that will reveal anything new.

[Svuppe]

Oh, and it wasn't firewall problems either. I don't use a firewall in the first place, and disabling my antivirus made no difference.
I also tried a simple file-download on a Linux machine I have, and that was limited to the same speed as my regular PC.

[FurryNutz]

Ok,
Was the 856L in the DMZ on the 855?
Did you change the WAN port speed on the new routers from Auto to say 10, then 100? What does your ISP support for the WAN port speed? Do you know. It's been 100 for a while and most new ISP Modems support 1000Mb so over here, I manually set the routers for 1000Mb.

Ok, seems like you have done some foot work here. Then the only other thing to test would be a ISP Stand alone modem at a different location. I presume and hope this will have positive results and presume it will probably point to the direction of there is a issue between your ISP service and this new gen routers.

I think after you can test at a different location, and what ever the results are, a phone support is going to be needed with DLink, ask for level 3 or higher support. Nothing level 1 or 2 can really do here. You, and information here in the forums have already covered that. If these routers work with a standard ISP stand alone modem, I really feel there is a problem between the ISP service and these routers. I would presume that maybe something on the ISP side could be at fault since it's older HW being used, however it would point also to the FW on these new gen routers  possibly not handling what ever the older HW connection are using.

[Svuppe]

No, the 865L was not in the DMZ.

But now you hit the nail on the head !!!  It was the WAN port speed setting.
I always had it on fixed 100 Mbps. I know the cabling going to our apartments aren't gigabit capable. The 855 works fine with this setting, so I just duplicated that in the 865. But switching it to Auto gives me all my speed in both directions.


And that is with SPI enabled, QoS enabled. Disabling QoS now gives a minor speed loss, but only a couple of Mbps.

Thank you very much for all your time spent resolving this. It is much appreciated.

[FurryNutz]

Well after 2 pages I'm certainly glad we found the problem.  
And not to rub it in, however it was mentioned in my first #1 reply to check WAN port speed settings. 

Awesome, well now maybe you can enjoy the 865L huh?

Enjoy.

[Svuppe]

Oh, do rub.
I know it was mentioned. I did believe I did the right thing setting it manually, as I've had problems with auto way back on my 655 router. But the symptoms then were quite different, as in a completely dead link. I never dreamt of putting it back to auto could solve this.

And yes, now I'll just enjoy this new router, and especially its way better performance/coverage on 5 GHz. Where I previously got a wireless link of 36 Mbps, I now have 108 Mbps.

[FurryNutz]

 
Come back and visit and keep us posted on how it works for you.

Enjoy.