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Network Security First-Step, Second Edition by Donald Stoddard, Thomas M. Thomas

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Router Configuration as VPN Peer

We wanted to include one of the ways to configure a router with the capability to be part of a site-to-site VPN. This particular configuration is important because Cisco routers make up 80 percent of the routers in operation today. Therefore, it seemed that many networks could have their security greatly increased by using the router to terminate VPNs.

Configuring ISAKMP

IKE exists only to establish SAs for IPsec, but before it can do this, it must negotiate an SA (an ISAKMP SA) relationship with the peer. Because IKE negotiates its own policy, you can configure multiple policy statements with different configuration statements, and then let the two hosts come to an agreement. ISAKMP negotiates the following: ...

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