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[AMPatrick]

I am using my DAP-1522 as a bridge. It communicates to my DLINK GamerLounge Wireless Router.  Version 1.21 of the firmware is in effect on my DAP-1522.  Turned on QOS on my DAP-1522 (set port 1 to "Video" - it is connected to a tera-byte NAS I use to record/play video media throughout my home - does 1 gig. ethernet).  Rebooted the DAP-1522.  Then the equipment that was plugged directly into the rear panel LAN jacks would no longer communicate with the NAS video server.  Further investigation revealed ARP tables in the PC's that were directly connected to the rear panel DAP-1522 LAN ports were being corrupted.  Computers accessing via the Wireless interface (using the DAP-1522 as a bridge) worked fine.  Turned off the QOS.  Rebooted the DAP-1522.  Everything worked again.  Detail:  With QOS turned on, the ARP tables for the PC,s directly connected to the DAP-1522 LAN ports showed a MAC address for my Port 1 "Video" server that was identical to the MAC address of the DAP-1522.  This probably isn't ever the right thing to do for the rear panel LAN ports - any equipment connected to the rear panel ports wouldn't be able to intercommunicate - which is just the symptom I was experiencing.  Turning off the QOS corrected this.  I think the DAP-1522 has a software glitch that needs to be fixed.

[lizzi555]

You are not alone 

http://forums.dlink.com/index.php?topic=10721.0

[MoonRock]

Same here. My Sony TV would lose connection not only the internet but also the local lan if the QoS on my 1522 was turned on.

[eelkes]

The DAP-1522's ports go through the internal Ethernet switch.  From a distance, all other computers may see is the MAC of that switch.