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I would setup NAT from one to a non-overlapping subnet on egress from the VR into the ISP VR.
This will give everything a unique address from the ISP VR perspective and return the traffic to the correct sources.
Steve Puluka BSEET - IP Architect - DQE Communications (Metro Ethernet/ISP) ACE PanOS 6; ACE PanOS 7; ASE 3.0; PSE 7.0 Foundations & Associate in Platform; Cyber Security; Data Center