My Linux-based NAS contains Net-Snmp v5.9.3. I found that both IPv4 and IPv6 work fine for the whole NAS functions except SNMP functions. Basically, Net-Snmp works fine except the following issue:
IPv4 works fine with Net-Snmp IPv6 with link local address (fexxxxxx...) works but glocal unicast address (2000 xxxxxx...) doesn't
That's, when browsed it's MIBs thru link local IPv6 address, it's fine. But if I browsed it thru global unicast IPv6 address, the agent didn't response.
What could be the reason why there is different effect between local / glocal IPv6 address?