Identifying IPSec Peers
IPSec requires the exact method of peer identity used for a session. There are two ways to identity a peer: via its fully qualified domain name (FQDN) or via an IP address. To configure the method of peer identity, we would issue the command:
R1 (config)# crypto isakmp identity {address | hostname}
The default is for the IOS-based router to identify its peer by IP address.
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