The growth of IPsec saw a rebirth in the use of GRE in IP networks. This chapter talks about the use of GRE in an IPsec environment
GRE Characteristics
Describes how generic routing encapsulation (GRE) can be used to encapsulate virtually any routed or routing protocol through an IP network
GRE Header
Describes the GRE header that defines what is carried inside the GRE tunnel
Basic GRE Configuration
Describes how to define the tunnel source, destination, mode, and contents
Secure GRE Tunnels
Describes how GRE and IPsec complement each other across the network
Configure GRE over IPsec Using SDM
Describes how SDM wizards permit easy configuration of GRE over IPsec
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