STIGQter STIGQter: STIG Summary: Oracle Linux 9 Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

OL 9 must not allow interfaces to perform Internet Control Message Protocol (ICMP) redirects by default.

DISA Rule

SV-271876r1092641_rule

Vulnerability Number

V-271876

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

OL09-00-006033

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure OL 9 to not allow interfaces to perform IPv4 ICMP redirects by default.

Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:

net.ipv4.conf.default.send_redirects = 0

Load settings from all system configuration files with the following command:

$ sudo sysctl --system

Check Contents

Verify that OL 9 does not allow interfaces to perform Internet Protocol version 4 (IPv4) ICMP redirects by default.

Check the value of the "default send_redirects" variables with the following command:

$ sysctl net.ipv4.conf.default.send_redirects
net.ipv4.conf.default.send_redirects=0

If "net.ipv4.conf.default.send_redirects" is not set to "0" and is not documented with the information system security officer (ISSO) as an operational requirement or is missing, this is a finding.

Vulnerability Number

V-271876

Documentable

False

Rule Version

OL09-00-006033

Severity Override Guidance

Verify that OL 9 does not allow interfaces to perform Internet Protocol version 4 (IPv4) ICMP redirects by default.

Check the value of the "default send_redirects" variables with the following command:

$ sysctl net.ipv4.conf.default.send_redirects
net.ipv4.conf.default.send_redirects=0

If "net.ipv4.conf.default.send_redirects" is not set to "0" and is not documented with the information system security officer (ISSO) as an operational requirement or is missing, this is a finding.

Check Content Reference

M

Target Key

5680