This paper reports supporting dynamic transport selection in omniORB2, which is a CORBA 2.0 compliant CORBA system that has been developed at AT& T Laboratories, in Cambridge. We describe our design and implementation of supporting dynamic transport protocol selection in our system, and some initial experiments with the system.In our approach, IIOP can be selected for ensuring interoperability between applications. Thus, applications adopting our system can communicate with those adopting other CORBA systems, which run on the Internet environment. On the other hand, an application can select more suitable transport protocols for improving its performance or ensuring its real-time constraints if a server also supports the same transport protocol according to the characteristic of the application.