IPv4/IPv6 transition gateway is deployed between IPv4 and IPv6 network
used to provide communication between IPv4/IPv6 networks. Providing network management to the transition gate way is important to guarantee the communication between IPv4/IPv6. However
the complexity of the traffic between IPv4/ IPv6 network and the NP (Network Processor) based structure of the transition gateway makes it difficult to implement network management. This paper presents a design of SNMP agent of the transition gateway. At the same time
it defines the NATPT MIB
implements the access of distribute MIB under NP environment. The agent can be accessed form both IPv4 and IPv6 network.