Correct. Is the 172.1.1.X network used by the Cisco routers only for WAN routing so each site has a unique LAN network? If that is true drop-in mode is the way to go.
Correct. Is the 172.1.1.X network used by the Cisco routers only for WAN routing so each site has a unique LAN network? If that is true drop-in mode is the way to go.