RHEL 9 must not have unauthorized IP tunnels configured.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-257950 | RHEL-09-252045 | SV-257950r1045006_rule | CCI-000366 | medium |
| Description | ||||
| 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). | ||||
| STIG | Date | |||
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2025-05-14 | |||
Details
Check Text (C-257950r1045006_chk)
Verify that RHEL 9 does not have unauthorized IP tunnels configured.
Determine if the "IPsec" service is active with the following command:
$ systemctl is-active ipsec
Inactive
If the "IPsec" service is active, check for configured IPsec connections ("conn"), with the following command:
$ sudo grep -rni conn /etc/ipsec.conf /etc/ipsec.d/
Verify any returned results are documented with the ISSO.
If the IPsec tunnels are active and not approved, this is a finding.
Fix Text (F-61615r925836_fix)
Remove all unapproved tunnels from the system, or document them with the ISSO.