What is open source firewall?

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Tags

1. #software
2. #installed
3. #metal
4. #managed
5. #through
6. #customised
7. #freebsd
8. #interface
9. #distribution
10. #solution
11. #source
12. #pfsense
13. #router
14. #security
15. #custom
16. #firewall
17. #hardware
18. #based
19. #especially
20. #kernel
21. #entirely