FYI folks...I used to run proxies on my subnet in the past. The only issue was, that since subnet is not not BGP, it was intended for your use only (i.e. not using AMPRGW for Internet, but still able to use EchoLink).
I used the Java JAR that was available form EchoLink (I understand you have a C program). I also used the Linux version, but the EchoLink Validators stated that should not be used without permission (and only for conference servers).
73,
- Lynwood KB3VWG