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= GRE - Generic Routing Encapsulation =
 * Links [[IpSec]] , [[dmvpn]]
 * GRE - is a tunneling protocol, works on Linux and Cisco, it provides no security.  Security can be added with IpSec.
 * GRE keepalives use tunnel source and destination addresses not the GRE tunnel IP 
   * Important when using gre with vrf as src/dest

== Use cases ==
 1. 3G backup on router.  The 3G link only provides a single IP on provider network, to route subnets, setup a GRE tunnel with the 3G ip as source to a central router.



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CategoryNetwork