Suricata needs to be restarted and a new "HOMENET" file needs to be generated, in case a new alias for red will be created or even if any of the existing ones will be changed or deleted.
Fixed: https://git.ipfire.org/?p=people/stevee/ipfire-2.x.git;a=commit;h=f6eb1a40a00625b7a83984461242e86347e48579