Two routers have been set up to establish a VPN tunnel. Both routers support GRE and IPSec, and both routers are configured with IPv4 and IPv6 addresses. You issue the tunnel mode auto command on both routers.

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Explanation:
The tunnel will not establish, because one router, the initiator, must be configured statically. The tunnel mode auto command enables the Tunnel Mode Auto Selection feature, which simplifies the configuration of a virtual private network (VPN) tunnel. When Tunnel Mode Auto Selection is configured, the responder will apply the tunneling protocol and transport protocol that is established by the initiator.
To configure a router to use Generic Routing Encapsulation (GRE) for the tunneling protocol and IPv4 for the transport protocol, you should issue the tunnel mode gre ipcommand. To configure a router to use GRE for the tunneling protocol and IPv6 for the transport protocol, you should issue the tunnel mode gre ipv6 command. To configure a router to use IP Security (IPSec) for the tunneling protocol and IPv4 for the transport protocol, you should issue the tunnel mode ipsec ipv4 command. To configure a router to use IPSec for the tunneling protocol and IPv6 for the transport protocol, you should issue the tunnel mode ipsec ipv6 command.