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    Setting Up a Secure GRE or DVMRP Connection Between E Series Routers

    In Figure 1, a secure GRE/IPsec connection is set up between two E Series routers.

    To set up a secure connection:

    1. Set up the IPsec connection between the two routers. IKE signals a security association (SA) between the two IPsec tunnel endpoints.

      Two unidirectional SAs are established to secure data traffic.

    2. Set up a GRE tunnel between the two routers.

    The GRE tunnel now runs over the SAs that IKE established.

    Figure 1: GRE/IPsec Connection

    GRE/IPsec Connection

    Published: 2014-08-12