Nessus free alternative: OpenVAS
His method:
Nessus:
- Scheduled for the assessment start date+time (8:00 AM and the email scheduled at the same time)
- Discovery: all default for external
- Port Scanning:
- 1-65535
- don’t scan for UDP
- Service discovery left default
- Web App Assessment:
- Generic web test
- Save
It will run whenever scheduled OR you can hit start to run it NOW