Thanks for the pointer. Now I can build and install horst (and tcpdump, wavemon, etc), but they can not sniff WiFi packets. Can you confirm whether GL-MT300N-V2 supports monitor mode?
Also I pre-ordered a GL-AR750 with the aim of using it as dual-band sniffer. If it cannot function as such, I would like to cancel my order.
The stock firmware of MT300N-V2 uses MTK driver and cannot support monitor mode. If you compile your own firmware, please try open source driver which should support monitoring mode. We don’t use the open source driver in this model as when it works as AP, it is not stable. But I am not sure about monitoring mode.
Other models include AR750 works in monitoring mode.