Tag Archives: BGP

by in Networking, Tips

Filtering Bogon prefixes IPv4 & IPv6

What are Bogon prefixes and why are they bad? Bogon prefixes are unassigned prefixes and reserved prefixes for private use only. The primary reason to filter out these advertisements is security. What to filter? IPv4 0.0.0.0/8 10.0.0.0/8 100.64.0.0/10 127.0.0.0/8 169.254.0.0/16 172.16.0.0/12 192.0.0.0/24 192.0.2.0/24 192.168.0.0/16 198.18.0.0/15 198.51.100.0/24 203.0.113.0/24 224.0.0.0/3 IPv6 3ffe::/16 2001:db8::/32 2001::/32 2002::/16 0000::/8 fe00::/9 […]

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