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How to allow access to ubuntu with UFW firewall for all addresses belonging to one ICT provider with its ASN number (Is it possible?)?

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  • No, not directly. Firewalls generally operate on IP adresses, not ASN's. You could periodically fetch IP's belonging to som ASN, but it would not be UFW; it would be custom software.
    – vidarlo
    Commented Sep 3, 2023 at 22:58

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