The Zerto Virtual Manager User Interface : Configure Paired Site Routing Dialog
  
Configure Paired Site Routing Dialog
The IP address, subnet mask, and gateway to access the peer site VRAs when access to the peer site VRAs is not via the default gateway.
Enable Paired Site Routing – When checked, enables paired site routing.
Address – The IP address of the next hop at the local site, the router, or gateway address that is used to access the peer site network.
Subnet Mask – The subnet mask for the peer site network.
Gateway – The gateway for the peer site network.
These access details are used to access the VRAs on the peer site.
The settings in the Configure Paired Site Routing dialog apply to all VRAs installed after the information is saved. Any existing VRA is not affected and access to these VRAs continues via the default gateway. If the default gateway stops being used, you must reinstall the VRAs that were installed before setting up paired site routing.