Bypassing TCP/UDP: An Unexpected Network Experiment

The author attempts to create a custom network transport protocol, bypassing TCP and UDP, to explore its behavior on different operating systems and network environments. Experiments reveal that the custom protocol partially succeeds in local loopback tests, but in cross-network environments, most cloud servers and network devices drop custom protocol packets except for AWS, and there are issues such as poor cross-platform compatibility. The final conclusion: Unless necessary, stick to TCP or UDP!