Chapter 11 IPsec VPN for FortiOS 5.0 : IPv6 Configuration : IPv6 IPsec VPN : Site-to-site IPv4 over IPv6 VPN example : Configure FortiGate A security policies
  
Configure FortiGate A security policies
Security policies are required to allow traffic between port3 and the IPsec interface toB in each direction. These are IPv4 security policies.
config firewall policy
edit 1
set srcintf port3
set dstintf toB
set srcaddr all
set dstaddr all
set action accept
set service ANY
set schedule always
next
edit 2
set srcintf toB
set dstintf port3
set srcaddr all
set dstaddr all
set action accept
set service ANY
set schedule always
end