RHEL 9 must not accept router advertisements on all IPv6 interfaces.
An XCCDF Rule
Description
An illicit router advertisement message could result in a man-in-the-middle attack.
- ID
- SV-257971r991589_rule
- Version
- RHEL-09-254010
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Configure RHEL 9 to not accept router advertisements on all IPv6 interfaces unless the system is a router.
Add or edit the following line in a single system configuration file, in the "/etc/sysctl.d/" directory:
net.ipv6.conf.all.accept_ra = 0