¶ Protection Test — GRC Shields Up
A quick port-scan against a Defend-O-Tron-protected router using GRC.com Shields Up shows the device's defense at work.
This report gives a full True Stealth rating — every probed port is blocked at the bridge before reaching the firewall, and the firewall/router itself refuses ICMP Echo. Your own report may vary depending on the ICMP configuration you use; ICMP is intentionally not part of the honeypot port list because it would interfere with Path MTU Discovery and IPv6 neighbour discovery.
¶ Try it yourself
- Visit GRC ShieldsUp.
- Run a Common Ports or All Service Ports scan.
- The IP being scanned is your public-facing IP — the same one the Defend-O-Tron protects from inbound probes.
If you see anything other than Stealth on a port that shouldn't be open, check the Honeypot page for the default port list, and check your firewall's port-forwarding rules for any rules that intentionally expose a service.
¶ Related Pages
- Architecture — the defense stack producing this result.
- Honeypot — the rules that catch the scanner attempting this report.
- Cyber-Threat Dashboard — see live threat activity against your own device.