IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the information system security officer (ISSO).
Check
Verify that AlmaLinux OS 9 does not have unauthorized IP tunnels configured.
Determine if the "IPsec" service is active with the following command:
$ systemctl status ipsec
ipsec.service - Internet Key Exchange (IKE) Protocol Daemon for IPsec Loaded: loaded (/usr/lib/systemd/system/ipsec.service; disabled; preset: disabled) Active: inactive (dead)
If the "IPsec" service is active, check for configured IPsec connections ("conn"), with the following command: