What methods can be used to determine how a process performs network interaction in Linux?

In Linux, the following methods can be used to determine how a process performs network interaction:

1. Using the lsof command

   • Shows open files and network connections of the process.
   • Example: lsof -p <PID> -i — displays the network sockets of the process with the specified PID.

2. The netstat or ss command

   • netstat -plant or ss -plant show active network connections and the processes using them.

3. Viewing files in /proc

   • In the directory /proc/<PID>/fd/, there are file descriptors of the process.
   • You can check which of them are sockets and match them with network connections.

4. Using strace

   • Tracks system calls of the process, including socket(), connect(), send(), recv().
   • Example: strace -p <PID> -e trace=network.

5. Using tcpdump or wireshark

   • Analyzes network traffic generated by the process (by IP/ports).

These methods allow understanding which ports and protocols the process uses, what connections are established, and how data exchange occurs.