I need you, an expert!
Arduino code, perhaps hardware support.
IPv4 and IPv6 on possibly W6100 MKR with an Arduino MKR zero, or on nano SAMD with ETH shield if possible!
Webinterface on SD card to setup IPv4 and IPv6 settings.
SNMP support in V1 or V2c or V3 choosable on the webinterface, too.
Interested? Looking forward.
..Later the code must be expanded by I/O functions and a RS485 communication.