Started off by
- Enabling unattended updates
- Enable only ssh login with key
- Create user with sudo privileges
- Disable root login
- Enable ufw with necessary ports
- Disable ping
- Change ssh default port 21 to something else.
Got the ideas from networkchuck
Did this on the proxmox host as well as all VMs.
Any suggestions?
this is not even all of it.
the big take away is i try to layer things. the endpoint devices are most important to protect and monitor as those are the foot hold something needs to then move through the network.
i then use network level protections to secure the remaining portions of the network from other portions of the network.
Messy…just messy
Anything that has internet access like your IoT can be C&C utilizing stateful connections. An outbound socket is built, and reflected traffic can come back in. Your IoT devices especially should not be exposed to the internet. They can’t even have an antivirus agent installed on them.