Network designers often segment networks by creating modules for various reasons. Sometimes however a network can be unintentionally segmented. For instance, if the only way to connect a remote site…

Virtual overlay networks such as IPsec VPN, GRE tunnels, or DMVPN encapsulate private corporate traffic inside public Internet packets, creating a logically private path between the remote site and headquarters without requiring dedicated private circuits, effectively desegmenting the corporate network.

Quality of Service marks and prioritizes existing traffic flows but does not create connectivity between networks that cannot already reach each other.

Removing control and data plane policy eliminates security and traffic management without establishing any path between the segmented network segments.

Blocking specific sources from reaching specific destinations further restricts reachability rather than restoring connectivity between the segmented sites.