Securing Routing Protocols

By default, network devices send routing information to and from their routing peers in the clear, making this information visible to all interested parties. Failure to secure the exchange of routing information allows an attacker to introduce false routing information into the network. By using password authentication with routing protocols between routers, you can enhance the overall security of the network. However, because this authentication is sent as clear text, it can be simple for an attacker to subvert this security control.

If you add message digest 5 algorithm (MD5) hash capabilities to the authentication process, routing updates no longer contain cleartext passwords, and the entire contents of the routing ...

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