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GRE/IPSec and DVMRP/IPSec Tunnels

In GRE/IPSec or DVMRP/IPSec connections, E-series routers can act as source and destination endpoints of the secure tunnel. Both sides of the connection run IPSec in transport mode with Encapsulating Security Payload (ESP) encryption and authentication.

In a GRE/IPSec or DVMRP/IPSec connection, the E-series router initiates an IPSec connection with a remote router. After establishing the IPSec connection, the E-series router establishes a GRE or DVMRP tunnel to the remote router. The tunnel is completely protected by the IPSec connection.

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