OL 8 must not perform packet forwarding unless the system is a router.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-248883	OL08-00-040260	SV-248883r780215_rule		Medium

Description
Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network.

STIG	Date
Oracle Linux 8 Security Technical Implementation Guide	2021-07-21

Details

Check Text ( C-52317r780289_chk )

Verify OL 8 is not performing packet forwarding unless the system is a router. Note: If either IPv4 or IPv6 is disabled on the system, this requirement only applies to the active internet protocol version. Determine if IP forwarding is enabled using the following commands: $ sudo sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 0 $ sudo sysctl net.ipv6.conf.all.forwarding net.ipv6.conf.all.forwarding = 0 If the IP forwarding value is "1" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix Text (F-52271r780214_fix)
Configure OL 8 to not allow packet forwarding unless the system is a router with the following commands: $ sudo sysctl -w net.ipv4.ip_forward=0 $ sudo sysctl -w net.ipv6.conf.all.forwarding=0 If "0" is not the system's default value, add or update the following lines in "/etc/sysctl.conf" or in the appropriate file under "/etc/sysctl.d": net.ipv4.ip_forward=0 net.ipv6.conf.all.forwarding=0