From Red Hat Enterprise Linux 6 Security Technical Implementation Guide
Part of SRG-OS-000096
Associated with: CCI-000382
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.
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.
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
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