@Brewer What you can do (to confirm the issue) is to test if the two laptops connected to SSID 1, with the same VLAN 20 can communicate with each other if one of them is connected through the...

@freebelion From your VR300 user guide (Chapter 1.2.1):

@Brewer From your description I understand the following: When both devices (on the same VLAN) are connected to the 801ND there's a problem communicating with each other. When one device is connected...

@pc273 The D-Link router you mentioned is not a gigabit router: It's worth to provide your laptop models too so their specifications can be checked as well. I had myself similar issues with HP Zbook...

@Ulises_Lopez This has been answered in your other thread.

@Mikhaill In your C80 check the WAN port negotiated speed - it's probably only 100mbps instead 1000mbps: For some reason C80 doesn't like the cable and negotiates a lower speed. Try with the shorter...