Numerous standards suggest or require the use of a login banner that clearly informs legitimate users and attackers that the system is for authorized users only. Substitute in your organization's banner below if this standard text isn't sufficient.
cat > /etc/banner <<EOF Authorized Users Only! Any attempted or unauthorized access, use, or modification is prohibited. Unauthorized users may face criminal or civil penalties. The use of this system may be monitored and recorded. If monitoring reveals unauthorized use than records may be provided to law enforcement. EOF uci set '[email protected].BannerFile=/etc/banner'
And don't forget to commit your settings!
Here's the script in github for easy download: https://github.com/SpotlightCybersecurity/openwrt-scripts/blob/master/banner_setup.sh