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I’m currently struggling to get the D-Link DGL-4300 to play nicely with the network here at home. I keep getting problems when doing large transfers over the wireless network.

The problems occur both towards the linux-server running samba 3.0.x and towards the stationary windows box. For the client it’s registered as either a “Delayed write error” or as “Disk Full” or whatever it comes up with when it fails towards the samba server if it’s running with “oplocks = no” which I turned on because it reported “request_oplock_break” in the log.

Using wired interface I can do stable transfers without any issues, I currently get 8MB/s towards the linux box with it’s 100Mbit network card, which is just about what that interface can take.

I’ve looked at the network traffic using Ethereal and it displays TCP DUP ACK, TCP Retransmission and once now and then even a TCP Window Update. The problems during transfers seem to be caused by TCP DUP ACK and TCP Retransmission.

I’ve tried turning off all the bells and whistles on the Router but it’s still running unstable. Yesterday I opened up a support case towards D-Link which resulted in them telling me to DOWNgrade(?) the Firmware from version 1.6W which it was delivered with from the factory to firmware version 1.6 which is the latest version offered by D-Link Sweden. I tried that earlier this evening with little success. The up(down)grade of the firmware went smoothly and everything came up as it should. But sadly enough I was able to reproduce the problems again…

I think I’ll try replacing the network cables just to be on the safe side… apparently there is something called CAT6 cables around now, might aswell upgrade to that.