NTT Cross, XE-100NE and OPNsense

[ChristianVirtual]

Hi, sorry for writing English in Japanese group. While living in Tokyo for quite a while my Japanese still very bad.

I struggle a bit to understand the need to use that complicated NTT XG-100NE router when attached to NTT Cross (and Asahai Net as ISP). I was not able to setup pooper mesh and had to change my wifi SSID when moving to second floor. I switch to a Buffalo AirStation setting with two units meshed which worked mostly ok; occasionally wifi drops.

My goal is to use an OPNSense roter directs after the ONU and eventually Unifi equipment. Does anyone here has luck with that setup ? Incl. DS-lite for IPv4 over IPv6 ?