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As far as I know 'newer' versions of routing protocols support authentication between routers.

What about encryption and integrity checks? Some implementations like this one from Cisco use MD5, which I dont feel secure using. How do you protect against MITM tampering with your routing tables?

Is there any easier way to protect from using IPSEC between your routers?

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From what I understand OSPFv3 uses IPSEC, at least on Cisco routers and OSPFv2 only supports MD5. – UzSh Dec 14 '15 at 13:16

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