From the course: Cisco Network Security: Secure Routing and Switching

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Routing update authentication

Routing update authentication

From the course: Cisco Network Security: Secure Routing and Switching

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Routing update authentication

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- [Instructor] Routers constantly communicate with their neighbors to provide updates. Without authentication, an attacker can spoof the router and send the wrong information. In this segment, we'll review the importance of routing update authentication to defend against spoofing attacks. Routers communicate with their neighbors to provide updates on route availability, bandwidth, and other metrics that are necessary for a router to make a routing decision. For example, routers using EIGRP periodically send update messages, which include the metrics, so the receiving router can calculate the relative distance. Without authentication, an attacker can spoof the router and send the wrong information that can modify the routing tables and lead to eavesdropping, Denial of Service, or hijacking. Routing protocol authentication prevents bogus updates from man-in-the-middle attacks. So let's talk about how this works. Here we see RouterA that wants to send an update to RouterB. It sends…

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