Good info, but I can't even connect to the Omega2+'s using the standard dock (not the Arduino dock).
Edit: Got two new units and still no luck. I am thinking something occurred on my machine which is preventing me from accessing the Omega's.
Edit2: I can connect using SSH to the default IP when connected to the Omega's AP. I can access the command line, but nothing else (omega-ABCD.local). I checked firmware and called for an install of the console, but still nothing. They are definitely connected to the main access point in the office here - I can ping websites fairly easy.
Edit 3: Likely because of the issue I am having, I cannot upload an Arduino sketch to the Dock2 board.
@Christian-Toller in the omega2 /etc/config/wireless you are missing the > in '<router SSID' for both instances. not that it matters, i just noticed when reading. it's a good guide should i have the problem. it was either you or someone else that mentioned this issue before and as i result i tested my omega2 devices by unplugging my router they connect to and all 3 of them had no issue with reconnecting once the router was back up so i started to think it might be an issue with your specific router but did not know of the re-write of the file at the time so i'll have to go and check the files before & after the next time i test.
it's difficult to say exactly why the packets are getting duplicated. However, one of the reasons could be that Omega AP has the same IP range as the router (ifconfig should tell you if this is the case).
Might be also worth connecting to your router with another device and pinging the same host to ensure that the router is not at fault.