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[cneuf802]

Ok, here's what going on....

I have two routers, my old one is a DIR-655 and my new one is the DIR-645. Both are setup identically on all setup pages. Both are in wireless N only mode with the dir-655 set at 40Mhz and the dir-645 set at auto 20/40Mhz.

When I connect to the dir-655 with the laptop onboard nic then right click the connection and select "status" the connection shows 150Mbps

When I connect to the dir-645 with the same nic and look at the same status it shows 65Mbps

I has the same results connecting to each router using a DWA-130 usb nic both with the laptop in question and a desktop. The only difference the dwa-130 made was that the 65Mbps was reported as 72Mbps.

The routers were run individually and together with the dir-655 as and access point connected to the dir-645 with the same results both times.

the dir-645 is running firmware ver: 1.01 and there is very little interference from nearby networks. There are no wireless G devices on the network either.

After all of this experimentation I feel sure the the issue rests with the dir-645. Possibly the auto 20/40 Mhz not going into the 40Mhz band and thus reducing the bandwidth to 65/72 Mbps.

I did read a comment on some forum somewhere (in my week long google dig for info on this) that the dir-645 might idle at 65Mbps and ramp up the speed as necessary ie: when doing a large file transfer over the lan. Though I found nothing that would confirm this.

Anyone have any ideas about what's going on? The dir-645 is advertised as a N300+ Single band router yet windows is reporting just a little above G speeds.

Thanks for your help.

[FurryNutz]

Care to try a Beta and see if it resolves your issue?

[cneuf802]

Sure, I'll give it a try.


edit: Can't seem to find a link.

[FurryNutz]

Look at post #13
http://forums.dlink.com/index.php?topic=44116.0

[cneuf802]

Unfortunately there was no change.

Connect to the DIR-655 @ 150Mbps
Connect to the DIR-645 @ 72Mbps

Using the DWA-130 usb adapter.

Very confused about this whole thing.

[FurryNutz]

Try setting the 645 to Single mode N only?

[cneuf802]

The dir-645 is in N only mode set at auto 20/40Mhz with transmission rate set at Best (automatic), using WPA2 / AES encryption.

This is identical to the setting on the dir-655 with the exception that the dir-655 is set to 40Mhz only mode. This is an option I don't have with the dir-645.

If you wish I can include screen shots of any of the setup screen you may wish to look at if need be. I'm out of ideas for any ways I could tweek the settings to make this work.

[FurryNutz]

Seems like there is a possible issue with the router. Is there any other N device that you can connect to the router and see if it has the same issue as a test.

I'm leaning on getting this router RMAd if other devices can't connect in the same way and achieve the same speed.

[cneuf802]

Woot! Partially solved the problem. There was a setting that the new 1.02 installed that I must have overlooked 8+ times before I caught it.

The setting is located in the "advanced wireless" tab and is called "HT 20/40 Coexistence" and gives the option to set "enable / disable" It is enabled by default.

When I set it to disable my connection jumped to 150Mbps

Now I just need to figure out how to get the N 300 speeds this router supports.

[FurryNutz]

Hmmm...I might have to look in to that..I noticed that I couldn't get my Mac BOOK Pro to connect higher than 130 on N mode. Thanks for this info.

Review the 300Mb requirements sticky for using 300Mb connections. Keep us posted.

EDIT: My MBP only supports 130Mb on 2.4Ghz. 
Links>Wireless Installation Considerations and Managing Signal Congestion and Good Neighbour Policy