Thats cool you worked it out on your own. Sucks for community lack of participation. I have been out for awhile and looked up your issue as I have an MT300Nv2 ‘Mango’ I had issue with it being unable to associate with community mesh AP. Since then I made 2 major changes in my network… 1) I got my own residential service restored by ISP
2) I purchased a GbE PoE/vlan unmanaged workgroup switch .
That switch was such an awesome addition. I use it solely in vlan mode which segments my network and allows downstream coexistence of an AR750 and MT300Nv2 on seperate vlan ‘trunks’ … the switch does this by attaching a unique tag ala RFC for 802.13?
The switch also has an SFP port that I bought a second workgroup switch with SFP port and 2m patch cable … effectively extending the original switch…
I could share brand but I wont. It doesnt matter. What does is having an ability to transparently tag your traffic such that you can have segmentation without subnetting or additional agents in the mix… get a VLAN switch.