#network #networking #aws #site_to_site #customer_gateway #gateway #cloudhub #aws #vpc

AWS VPN CloudHub uses an AWS VPC with multiple customer gateways in a setup.

Few specifications:

  • It’s the simple hub and spoke model. Hub is VGW, spoke is each CGW.
  • Each customer gateway has use unique BGP (Border Gateway Protocol) system number (ASN).
  • The AWS VGW will advertise the appropriate route with (BGP prefix) over the VPN connection, then remote network will receive the routing advertisements and can connect to others.
  • The ASN for each remote network has to be unique, and the IP ranges is not overlapped.
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