There are many freely available TCP/IP stakcs (OpenTCP, lwIP, ethernut etc.) as well as many commercial ones (NetX, CMX, ...) . I would appreciate if you can comment on the performance of TCP connections (as well as UDP, if available). The type of micro used as well as CPU clock is also usefull. This is not a school project nor market survey. I simply want to see what can I expect from such solutions. Commercial ones usually give memory footprints, but performace is never shown...Thank you in advance.