| Verify RHEL 8 does not accept IPv4 source-routed packets by default. |
Check the value of the accept source route variable with the following command:
$ sudo sysctl net.ipv4.conf.default.accept_source_route
net.ipv4.conf.default.accept_source_route = 0
If the returned line does not have a value of "0", a line is not returned, or the line is commented out, this is a finding.
Check that the configuration files are present to enable this network parameter.
$ sudo grep -r net.ipv4.conf.default.accept_source_route /run/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf /etc/sysctl.d/*.conf
/etc/sysctl.d/99-sysctl.conf: net.ipv4.conf.default.accept_source_route = 0
If "net.ipv4.conf.default.accept_source_route" is not set to "0", is missing or commented out, this is a finding.
If conflicting results are returned, this is a finding.