Hey y'all,
I have a small network with opnsense firewall, a unify ap, some client in different subnets, vpn, DNS and some servers.
As I am completely self thought, I got everything to run reading the docs and forums, but I have no idea how to test if what I build is safe and stable.
Are there good up to date tools, or checklists one could follow to audit the different parts of the network (most important the opnsense config)?
What do you check if looking for security issues?
The network mostly relies on client separation through different subnets on different vlans, but I fear I dont understand how for example the vpn and the nas work together in detail to be sure there is no security implication I oversee.
Also: how do you handle client authentication for devices on the same subnet? I know IP/mac-adress ARP entries are easily spoofed and therefore not secure, but I haven't seen how to do it correctly
Yes, but once you try to hack yourself you'll research how it works and this will give you knowledge about how to secure a network.
You basically need to purple team yourself. You're both attacker (red team) and defender (blue team).
Try to make a list of attack surfaces and think about (and research) possible attacks. Then you try to execute said attacks.
There's basically no other way to test if something is safe and stable than to try to break it.