The system must ignore ICMP redirect messages.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| low | V-216137 | SRG-OS-000480 | SOL-11.1-050070 | SV-216137r959010_rule | 2026-02-19 | 3 |
Description
Ignoring ICMP redirect messages reduces the likelihood of denial of service attacks.
ℹ️ Check
Determine if ICMP redirect messages are ignored.
# ipadm show-prop -p _ignore_redirect -co current ipv4
# ipadm show-prop -p _ignore_redirect -co current ipv6
If the output of all commands is not "1", this is a finding.
✔️ Fix
The Network Management profile is required.
Disable ignore redirects for IPv4 and IPv6.
# pfexec ipadm set-prop -p _ignore_redirect=1 ipv4
# pfexec ipadm set-prop -p _ignore_redirect=1 ipv6