Because the destination is on the same subnet, Computer 1 does not send traffic to the default gateway (Router Y). Instead, it communicates directly with Computer 2 using ARP to resolve the MAC ...
Currently in NATTED mode with ipv4 and ipv6 everything is statically routed, your VR is assigned a public ipv4 address from a pool, a private ipv4 subnet, and an ipv6 subnet (of course with ipv6 there ...