The Simplest and Last Internet-Only ACL You’ll Ever Need
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Feed Name: Black Hills Infosec Blog
This brief guide offers a four-line ACL example to isolate an IoT/guest network (example 10.99.99.0/24) by denying access to private RFC1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and allowing outbound Internet access, along with a recommendation to hand out public DNS servers via DHCP.
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