When lag is enabled, TCP link establishment fails at localhost address.

[zshuaia]

I'm testing the runtime environment for network latency for a local TCP application. When I enable lag, whether it is 1ms or more, my TCP server does not receive any link information from the tcp client, resulting in TCP link establishment failure.

I started one of the simplest web servers with python -m http.server 8000, but with lag on, it still didn't work.