On linux the net-tools suite of utilities has been long since deprecated. The relevant code that gets executed on Fedora and EPEL should be identified and patched out, with a suitable pull request upstream, to remove the dependency on any tool in the net-tools package and instead use suitable tools form iproute2.
Filed an issue upstream: https://github.com/mrash/psad/issues/53 .
This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle. Changing version to '28'.
Bumping to rawhide. This must be fixed upstream, patches welcome.
Upstream implemented this and fix will be included in the next release.
Fixed in F30+.