I have site to site connection over the GRE tunnel it was working fine
but now the GRE point to point IP is only ping and I found this result
from my t-shootingFortiGate <> cisco172.25.52.1, 2 is the GRE
tunnel source192.168.51.0/24 is the Cisco LAN ...
thank you @DPadula I make sure of this and the routing is going
correctly from both sides as shown belowfortigate Routing table for
VRF=0Routing entry for 192.168.51.0/24Known via "static", distance 10,
metric 0, best* 172.25.52.2, via xxx-store <---...
