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The system must not be performing packet forwarding unless the system is a router.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-72309 | RHEL-07-040740 | SV-86933r1_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 |
|---|---|
| Red Hat Enterprise Linux 7 Security Technical Implementation Guide | 2017-07-08 |
Details
| Check Text ( C-72543r1_chk ) |
|---|
| Verify the system is not performing packet forwarding, unless the system is a router. Check to see if IP forwarding is enabled using the following command: # /sbin/sysctl -a | grep net.ipv4.ip_forward net.ipv4.ip_forward=0 If IP forwarding value is "1" and the system is hosting any application, database, or web servers, this is a finding. |
| Fix Text (F-78663r1_fix) |
|---|
| Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.ip_forward = 0 |