tencent cloud


Use Limits

Last updated: 2021-12-17 14:39:42

    VPN Connections

    Note the following when using a VPN connection:

    • After configuring VPN parameters, you need to add routing policies for your VPN gateway in the route table associated with the subnet, so that network requests from CVMs in the subnet to access the peer IP range can reach the customer gateway through the VPN tunnel.
    • After configuring the route table, you need to ping an IP address in the peer IP range from a CVM in the VPC to activate the VPN tunnel.
    • The stability of the VPN connection depends on the ISP's public network.
    • The limits on resources are as follows:
      Limit (quantity)
      VPN gateways in one VPC 10
      Customer gateways in one region 20
      VPN tunnels supported by one customer gateway 20
      VPN tunnels that can be created on one VPN gateway 20
      SPDs in a VPN tunnel 10
      Peer IP ranges supported by a SPD 50
      Number of CCN-type VPN gateways per account per region 10
      Routes supported by each VPN gateway route table 1,000
      Number of routes can be added at one time on the console 10

      • The number of VPN tunnels supported by a customer gateway is the quota for the account.
      • Only one VPN tunnel can be established between a pair of customer gateway and VPN gateway in a VPC.
      • To increase the quota, please submit a ticket.

      Customer Gateway

      The following IP addresses CANNOT be used as the public IPs for a customer gateway:

      • Multicast addresses that are all 0, all 225, or start with 224.
      • Loopback addresses: 127.x.x.x/8.
      • IP Addresses with host bits being all 0 or all 1, for example:
        1. Class-A IP addresses that start with 1-126, such as 1- and 1-
        2. Class-B IP addresses that start with 128-191, such as 128-191.x.0.0 and 128-191.x.255.255.
        3. Class-C IP addresses that start with 192-223, such as 192-223.x.x.0 and 192-223.x.x.255.
      • Internal service addresses: 169.254.x.x/16.
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