Updated on 2025-09-17 GMT+08:00

Packet Loss Occurs

Symptom

  • Packet loss occurs when a server in an on-premises data center pings an ECS in a VPC.
  • Packet loss occurs when an ECS in a VPC pings a server in an on-premises data center.

Procedure

  • Check the customer-side networking and bandwidth.
    • Check whether the customer network has multiple egresses working in load balancing mode and whether traffic destined for the cloud is distributed to a non-VPN egress. Ensure that the traffic destined for the cloud is transmitted through the same egress.
    • Ping the IP address of the VPN gateway at the cloud side and other public IP addresses (for example, 114.114.114.114) from the customer gateway to check the delay and packet loss rate on the public network.

      If the quality of the public network is poor, you are advised to seek help from the corresponding carrier.

    • Check whether traffic on the customer gateway device exceeds the bandwidth limit.
  • Check the cloud-side networking and bandwidth.
    • Check whether traffic exceeds the bandwidth of the VPN gateway.

      If traffic exceeds the bandwidth of the VPN gateway, increase the bandwidth.