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The rdisc service must not be running.


Finding ID Version Rule ID IA Controls Severity
V-218020 RHEL-06-000268 SV-218020r505923_rule Low
General-purpose systems typically have their network and routing information configured statically by a system administrator. Workstations or some special-purpose systems often use DHCP (instead of IRDP) to retrieve dynamic network configuration information.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2020-09-03


Check Text ( C-19501r377075_chk )
To check that the "rdisc" service is disabled in system boot configuration, run the following command:

# chkconfig "rdisc" --list

Output should indicate the "rdisc" service has either not been installed, or has been disabled at all runlevels, as shown in the example below:

# chkconfig "rdisc" --list
"rdisc" 0:off 1:off 2:off 3:off 4:off 5:off 6:off

Run the following command to verify "rdisc" is disabled through current runtime configuration:

# service rdisc status

If the service is disabled the command will return the following output:

rdisc is stopped

If the service is running, this is a finding.
Fix Text (F-19499r377076_fix)
The "rdisc" service implements the client side of the ICMP Internet Router Discovery Protocol (IRDP), which allows discovery of routers on the local subnet. If a router is discovered then the local routing table is updated with a corresponding default route. By default this daemon is disabled. The "rdisc" service can be disabled with the following commands:

# chkconfig rdisc off
# service rdisc stop