GRE/IPsec and DVMRP/IPsec Tunnels Overview

In GRE/IPsec or DVMRP/IPsec connections, the E Series router acts as source and destination endpoints of the secure tunnel. Both sides of the connection run IPsec in transport mode with the Encapsulating Security Payload (ESP) encryption and authentication.

In a GRE/IPsec or DVMRP/IPsec connection, E Series routers initiate an IPsec connection with a remote router. After establishing the IPsec connection, the E Series routers establish a GRE or DVMRP tunnel to the remote router. The tunnel is completely protected by the IPsec connection.

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