OK have added a simple network picture to simplify my description.
3 sites A, B and C
GRE tunnel between A and B
GRE tunnel Between C and B
GRE tunnels works no problem!
on site B i have device x.x.x.10 i'm able to ping that device from site C via tunnel as well as all other devices on that network.
From site A from any PC I may ping any device on site B but not the device x.x.x.10 via GRE, x.x.x.10 ping timing out. If i ping x.x.x.10 from site A router itself ping is successful Did i mention what i may ping any other device? Yes I can ping any other devise on site B but not x.x.x.10
Where is the problem? cause I'm giving up already unless its something to do with ISP
Any smart ideas.?