The system must not respond to multicast echo requests.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| low | V-216136 | SRG-OS-000480 | SOL-11.1-050060 | SV-216136r959010_rule | 2026-02-19 | 3 |
Description
Multicast echo requests can be useful for reconnaissance of systems and for denial of service attacks.
ℹ️ Check
Determine if response to multicast echo requests is disabled.
# ipadm show-prop -p _respond_to_echo_multicast -co current ipv4
# ipadm show-prop -p _respond_to_echo_multicast -co current ipv6
If the output of all commands is not "0", this is a finding.
✔️ Fix
The Network Management profile is required.
Disable respond to echo multi-cast for IPv4 and IPv6.
# pfexec ipadm set-prop -p _respond_to_echo_multicast=0 ipv4
# pfexec ipadm set-prop -p _respond_to_echo_multicast=0 ipv6