What are bogon routes and why should they be a concern to ISP network administrators?
What are bogon routes?
Bogons are martians (private and reserved addresses defined by RFC1918, RFC5735 and RFC 6598) and net blocks that have been allocated to a regional internet registry (RIR) by the internet assigned numbers authority (IANA).
A bogon prefix is a route that should never appear in the internet routing table therefore packets routed over the public internet with a source address in a bogon range should be discarded.
Why should bogon prefixes be a concern to ISP network administrators?
Bogons are used by malicious internet users and hackers to launch DDoS attacks and IP address spoofing. In fact, most of the frequently attacked sites, 60% of the naughty packets were obvious bogons.
What should you do as an ISP network administrator to guard your network against bogons?
You need to filter and reject or discard bogon routes at your BGP edge router so they don’t enter your routing table as valid destinations ... read more