I'm trying to figure out how to provide a proxy server for Modbus/TCP traffic. This is non-http traffic (industrial protocol), and usually connects to port 502.
The purpose is to give remote devices a static IP address which they can connect to (i.e. a cheap cloud server) while supporting dynamic IP addresses at the destination (i.e. standard DSL/cable internet).
Can SQUID (or other linux-based proxy) be configured to
Listen on port 502 for incoming connections
Transparently pass the connection on to an IP address which is specified in the configuration file
Support dynamic destination IP addresses, possibly linked to a dynamic DNS update client or hostname?
Suggestions for accomplishing this are greatly appreciated.
