this post was submitted on 22 Nov 2023
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Do you monitor network traffic? How? (alien.top)
submitted 11 months ago by [email protected] to c/[email protected]
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With my zoo of docker containers and multiple servers hosted locally or on some cloud providers, I feel the need more and more to understand what kind of network traffic is happening. Seeing my outbound traffic on some cloud providers I'm sometimes wondering "huh-where did that traffic come from?".

And honestly I have to say: I don't know. Monitoring traffic is a real hurdle since I'm doing a lot via tunnels / wireguard in between servers or to my clients. When I spin up a network analysis tool such as ntopng, I do see a lot of traffic happening that is "Wireguard". Cool. That doesn't help me one bit.

I would have to do some deep package inspection I suppose and SSL interception to actually understand WHAT is doing stuff / where network traffic comes from. Honestly I wouldn't be sure what stuff would be happening if there were some malicious thing running on the server and I really don't like that. I want to see all traffic and be able to assign it to "known traffic" or in other words - "this traffic belongs to Jellyfin", "That traffic is my gitea instance", "the other traffic is syncthing" or something along those lines.

Is there a solution you beautiful people in this subreddit recommend or use? Don't you care?

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[–] [email protected] 1 points 11 months ago

I've been a network engineer, security analyst, security engineer, and SOAR engineer over the course of the last 20 years; I don't want to think about any of that shit when I'm not being paid for it. I have backups of the things I can't replace, no port forwarding/ingress rules from WAN on the firewall, and the network is heavily segmented and uses least privilege. The random security stuff I leverage is set to drop/block and my family does a good job being vocal when something isn't working. If I needed to start over tomorrow, I'd just build a new server with Ansible playbooks on my GitHub.