GRE Tunnel Configuration Tasks

Following steps are involved in configuration of IP tunneling in Cisco IOS:

Specify the Tunnel Interface
- interface tunnel number
Configure the Tunnel Source
- tunnel source {ip-address | type number}
Configure the Tunnel Destination
- tunnel destination {hostname | ip-address}
Configure the Tunnel Mode (GRE by default)
- tunnel mode {aurp | cayman | dvmrp | eon | gre ip | nos}
Configure End-to-End Checksumming
- tunnel checksum
Configure a Tunnel Identification Key (form of weak security to prevent misconfiguration or injection of packets from a foreign source)
- tunnel key key-number
Configure a Tunnel Interface to Drop Out-of-Order Datagrams
- tunnel sequence-datagrams

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