As per here
http://www.draytek.co.uk/support/guides/kb-wan-wireless?highlight=WyJ3aXJlbGVzcyIsIid3aXJlbGVzcyIsIid3aXJlbGVzcycsIiwiY29ubmVjdGlvbiIsImNvbm5lY3Rpb24nLCIsImNvbm5lY3Rpb24nIiwiY29ubmVjdGlvbidzIiwid2lyZWxlc3MgY29ubmVjdGlvbiJd

Has anyone actually got this to work? I'm trying it with my 2860 n+ and a Netgear 4G Aircard mobile hotspot but I just can't get internet access to work. I can ping 8.8.8.8 from the router and from PCs on the LAN but there is no internet access.

Any pointers?

Yes, it keeps coming in handy in multiple situations

Might be something relating to the channel bandwidth in use on each device. Check in the advanced setting, channel bandwidth. If it's not connecting for you try with it set to 20 only or 40 only or 20/40, so there are 3 combinations to try.

If the WAN has come up on the WAN2 then try with Hardware Acceleration disabled.

Turned out to be a DNS issue - removing the DNS server IPs from my LAN settings did the trick!

Thanks for your help anyway.