c++ TCPIP client and host service

This bid is for a client server TCPIP dll, and a c# wrapper as well. Currently I am using a very sophisticated DLL written in c. The dll was written in 1992 and can use a sersious update. I need to build from the same foundation that I am already using. I have the sources for a model to go by. Thanks and good luck bidding..... ## Deliverables I need somone with an expert knowledge about Sockets and TCPIP transport system. The existing dll has an ocx that will not be needed in the new version. The new version of the software will be all dll's. The purpose of this update is to use TCPIP and binary data transport to the fullest. I am looking for a high speed application to transport data from client to server. The current library supports encrytption, compression, binary conversion and many other features. Speed and perfect reliablity are what are very important here. I cannot have a slow performance from this because it is the foundation to our software. The other important thing is the methods, procedure names and value members cannot be changed as they are being used in all of our applications. However the transport and the wait mode are the important things to be address. I will be able to give the code to a few people based on expertise and an interview style process. I cannot stress the importance of this project and I need some experts in this field.