SDN overlay · the table that disambiguates
Dashed = logical IP · what the VM sees
Solid = physical · SDN layer only
What the VM sees — just the logical IP
↓
SDN layer · hidden from the tenant
mapping table · (VPC, logical IP) → physical host
VPC
logical IP
physical host
vpc-a
10.0.0.5
10.51.0.7
vpc-b
10.0.0.5
10.51.0.9
packet on the wire · vpc-a's 10.0.0.5
outer · dst 10.51.0.7 (physical host, from table)
inner · dst 10.0.0.5 (vpc-a, what the VM sent)
payload
The full descent — where addressing bottoms out
overlay10.0.0.5logical · what the VM sees
↓mapping service / Andromeda · encapsulate
substrate10.51.0.7physical host · the cloud's own fabric (real, routable here)
↓ARP
linkMAC → switch portcopper / fiber · stops here — no third IP