Recently network bandwidth that is available at home or
office increases rapidly.  However, processing overheads of
communication are too large to exploit the huge bandwidth
efficiently. In this paper, we propose an innovative
network-interface architecture ``Memory-Based Processor II (MBP2)''
that enables application programs to execute send/receive without
system-calls under proper protection and virtualization.
The MBP2 adopts memory-based architecture where direct communication
between application spaces is performed without kernel services.
We also introduce a built-in microprocessor ``Casablanca'' that
can cooperate efficiently with DMA and Interrupt mechanisms.