Installed, changed the retention to 12 periods (months), added "guest" and "vpn" to local networks, "lan" was already there. "lan" has no IPv6, "guest" and "vpn" have a fixed prefix thanks to a he.net tunnel.
config nlbwmon option commit_interval '24h' option refresh_interval '30s' option database_directory '/var/lib/nlbwmon' option database_interval '1' option database_limit '10000' option protocol_database '/usr/share/nlbwmon/protocols' option database_generations '12' list local_network '192.168.0.0/16' list local_network '172.16.0.0/12' list local_network '10.0.0.0/8' list local_network 'guest' list local_network 'lan' list local_network 'vpn0'
not much but there should be some IPV6 traffic in the stats, yet there is none.
I saw a bugreport comment mentioning issues with changing prefixes but this is not my case: I have a fixed /48
The examples show IPV6 works but ... is there additional config to write?