This video provide how to configure GRE over IPSce VPN Tunnel, IPSec VPN cannot forward any multicast and broadcast traffic as a result any dynamic routing protocol such as OSPF,RIP or EIGRP cannot forward traffic.GRE Protocol support transport traffic over IPSec VPN Tunnel.Mikrotik IPSec VPN tunnel protect LAN Traffic between two remote sites.
See More :http://mikrotikroutersetup.blogspot.com/2012/01/mikrotik-routers-site-to-site-gre-over-ipsec-tunnel-configuration.html
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