A firewall is only as secure as its configuration. These ten tips will help you get the most security from your firewall deployment.
- Apply the “default deny” principle — block everything and only allow what’s explicitly needed.
- Change all default passwords on day one, before the device goes live.
- Restrict management access to dedicated management IP addresses or a management VLAN.
- Enable comprehensive logging and ship logs to a SIEM or centralized log server in real time.
- Review all firewall rules quarterly and remove any that are no longer needed.
- Document every rule — who requested it, why it exists, and when it was added.
- Apply firmware updates promptly, especially security patches.
- Enable geo-blocking for regions from which you don’t expect legitimate traffic.
- Use IPS signatures appropriate for the services you’re protecting.
- Test your firewall configuration regularly using external vulnerability scans.