OL 9 must not have unauthorized IP tunnels configured.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-271863	SRG-OS-000480-GPOS-00227	OL09-00-006010	SV-271863r1092639_rule	2025-05-08	1

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).

ℹ️ Check
Verify that OL 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) Active: inactive (dead) If the IPsec service is active, check for configured IPsec connections ("conn"), with the following command: $ 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.

ℹ️ Check

Verify that OL 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) Active: inactive (dead) If the IPsec service is active, check for configured IPsec connections ("conn"), with the following command: $ 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
Remove all unapproved tunnels from the system, or document them with the ISSO.