Anyone know good tools for monitoring inbound and outbound connections on Linux? I'm starting to treat programs running on my machine in more an adverse manner and would like to make sure these sort of problems are not happening on Linux as well.
I have been wondering about a separate firewall box. I asked [0] on the OPNSense forums if it could do what I want, but haven't had a response. Nor have I felt up to experimenting on a vm (due to sickness).