My Setup is site-2-site VPN with mix of GRE with IPSEC Tunnel and IPSEC Tunnel.
Routing protocol is OSPF
All Sites are connecting to HQ
HQ to Site A
HQ to Site B
HQ to Site C
HQ to Site D
Some of the Tunnels are not stable, I suspect overlapping of network or could be another issue. But Working hours all looks OK.
How can i verify overlapping issues, if overlapping occurs how to overcome.