How to simulate TCP read, write, and connect timeouts:
- Connect timeout
Option 1: Drop all SYN packets with firewall or iptables rules
Option 2: Try connecting to a non-routable IP, e.g., 10.0.0.0
- Read timeout
Read from a socket to which the client or server is not writing while keeping the socket open on both ends.
- Write timeout
You’re (almost) out of luck. There are OS-level buffers, so the write timeout might never happen.
Option 1: Use https://github.com/openresty/mockeagain and LD_PRELOAD to mock syscalls