3.7. Task 3.7: Securing Links Between Routers
Two of the most commonly secured types of communication between routers are at a low level over the link itself, using the Point-to-Point Protocol (PPP), and at higher levels through a dynamic routing protocol, such as OSPF, using MD5 encrypted authentication, for example. Without inter-router security, you open your network to man-in-the-middle attacks. Such attacks are perpetrated by connecting to a common network with the target router and influencing routing decisions with unauthorized advertisements. Additionally, legitimate advertisements can be intercepted transparently by others, thus giving attackers information about your private network to which they should not be privileged.
If PPP authentication ...
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