Mutually Agreed Norms for Routing Security (MANRS) is a global initiative, supported by the Global Cyber Alliance , that provides crucial fixes to reduce the most common routing threats.

MANRS outlines four simple but concrete actions that network operators should take:

Filtering – Ensure the correctness of your own announcements and of announcements from your customers to adjacent networks with prefix and AS-path granularity

Anti-spoofing – Enable source address validation for at least single-homed stub customer networks, your own end-users, and infrastructure

Coordination – Maintain globally accessible up-to-date contact information

Global Validation – Publish your data, so others can validate routing information on a global scale

A separate set of Actions applies explicitly to Internet Exchange Points and CDN and Cloud providers.

Mutually Agreed Norms for Routing Security (MANRS)

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