When the destination network for a traffic flow is not within the SDDC, the Mobility Optimized Networking policy is evaluated.
MON policy routes define which traffic is routed through the source gateway versus traffic that is routed through the cloud gateway. The Advanced tab in the HCX Network Extension interface provides an option for configuring policy routes.
When the destination network for a traffic flow is not within the SDDC tier-1 router, the MON policy is evaluated:
If the destination IP is matched and configured as allow in the MON policy configuration, the packet is forwarded to the premises gateway using the HCX Network Extension appliance.
If the destination IP is not matched, or configured to deny in the MON policy, the packet is forwarded to the SDDC Tier-0 to be routed.