An HA VPN with two tunnels in active/passive between your VPC and on‑prem increased traffic from 1 Gbps to 4 Gbps and packets are being dropped. How do you configure the VPN to support 4 Gbps?

The correct solution is to configure a second set of active/passive VPN tunnels. Each HA VPN tunnel has a maximum throughput of 1.25 Gbps. To achieve 4 Gbps, you need multiple tunnels. A second set of active/passive tunnels would provide an additional 1.25 Gbps, allowing for a total of 2.5 Gbps (two active tunnels). For 4 Gbps, you would likely need to configure four active tunnels, which means two sets of active/active tunnels, or four sets of active/passive tunnels. Configuring the remote ASN to 4096 is irrelevant to throughput. A second Cloud Router is not needed to scale bandwidth for VPN tunnels; Cloud Routers manage BGP sessions and route propagation, not tunnel throughput directly. Configuring the MTU to its highest supported value might slightly improve efficiency but won't scale throughput from 1 Gbps to 4 Gbps, as the tunnel's underlying capacity limit remains.