Chapter 13 IPSec VPN

VPN tunnels are used to connect physically isolated networks that are more often than not separated by nonsecure internetworks. To protect these connections, we employ the IP Security (IPSec) protocol to make secure the transmission of data, voice, and video between sites. These secure tunnels over the Internet public network are encrypted using a number of advanced algorithms to provide confidentiality of data that is transmitted between multiple sites. This chapter explores how to configure routers to create a permanent secure site-to-site VPN tunnel.

Encryption will be provided by IPSec in concert with VPN tunnels. The Internet Security Association and Key Management Protocol (ISAKMP) and IPSec are essential to building ...

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