Hi Frank, In SNMP4j test agent binding IP as 0.0.0.0/161. I have observed the issue as below So in case of IPv6 For example let’s take SNMP Agent running device IP V6 Stateless address as “A” and “B” as State full Address. If SNMP Manger sends the request with the device IP as A, But the SNMP agent response packet is having the device IP as “B”.