We describe the architectural design
and the implementation of the one-way layer-7 Web switch based
on the TCP Handoff approach, called ClubWeb-1w.
The switch software has been conceived as an extension of
the TCP/IP stack under the Linux operating system,
kernel version 2.4.18. Particular care has been taken
in avoiding slow and inefficient constructs, and in
implementing thread-safe code. The implementation
takes full advantages of the Linux multi-threaded TCP/IP
stack and results particularly efficient on SMP nodes.
The cluster operations are implemented through the following
software modules: dispatcher, forwarder,
THOP communication protocol, load monitor.
We describe them by showing how they fulfill the
design requirements in