tencent cloud



Last updated: 2024-01-09 14:20:07

    What is an IPsec VPN?

    IPsec VPN is used to connect customer IDC with a VPC through an encrypted tunnel over a public network. Tencent Cloud IPsec VPN connection consists of the following components:
    VPN gateway: an IPsec VPN gateway in a VPC. It is used with a customer gateway (IPsec VPN gateway on the IDC side) to establish an encrypted communication between the VPC and your IDC.
    Customer gateway: an IPsec VPN gateway on the IDC side that is mapped to the VPC. It is used with a VPN gateway. Each VPN gateway can create encrypted VPN tunnels with multiple customer gateways.
    VPN tunnel: an encrypted IPsec VPN tunnel over the public network. After the VPN gateway and customer gateway are created, you can establish a VPN tunnel between the VPC and an external IDC for encrypted communication.

    Can a VPC connect to multiple IDCs through VPN connections?

    Yes. You can create VPN gateways in a VPC and create multiple VPN tunnels for each VPN gateway. Each VPN tunnel connects the VPC to one local IDC.

    What are differences between Direct Connect and IPSec VPN connections?

    An IPsec VPN connection establishes an encrypted network connection between your IDC and VPCs based on the public network and IPsec protocol. You can purchase a VPN gateway and make it effective in just a few minutes. However, a VPN connection may be interrupted due to public network jitters or congestion. When your business does not require a high-quality network connection, the VPN connection is a cost-effective choice for rapid deployment.
    Direct Connect provides a network connection solution dedicated to your business. The configuration may take a longer time, but it can provide a highly reliable network connection. When your businesses have a higher requirement for the network quality and security, this option fits in.
    The table below lists their specific differences.
    Direct Connect
    IPsec VPN Connection
    Stable network latency
    Network latency is stable and guaranteed. A Direct Connect instance accesses the network through dedicated links, and supports fixed routes, removing the pain of unstable latency caused by network congestion or failure bypass.
    Network latency is unstable. An IPsec VPN connection accesses the network over the Internet, which may be exposed to bypass due to network congestion.
    Highly reliable disaster recovery access
    Access devices and network forwarding devices are deployed in distributed clusters to ensure high reliability of all links. It also supports dual-line access with protection to provide more than 99.95% of uptime.
    Features a dual-server hot backup architecture with high availability at the gateway layer. However, it cannot provide the same network availability as dedicated lines due to the unreliable Internet links.
    High bandwidth
    It provides a bandwidth of up to 10 Gbps for each link. You can have multiple 10 Gbps links for network load balancing, so it can theoretically support unlimited bandwidth.
    A single IPsec VPN gateway supports a bandwidth of up to 1 Gbps and a VPC can have multiple VPN gateways, which can meet the need for a VPN connection larger than 1 Gbps.
    High security
    Dedicated network links offer strong security without data leakage risks, satisfying the demanding network connection requirements of the finance and government sectors.
    Network transmission is encrypted using IKE pre-shared key, which can satisfy the security requirements for most network transmission.
    Network address translation
    It supports configuring the network address translation service on gateways, as well as IP mapping on the two sides of Direct Connect and IP port mapping on the VPC side, to avoid address conflict in case of interconnection among multiple networks.
    Not supported.

    What are the limitations on using a VPN?

    To use a VPN, take notice of the limitations on IP addresses of the VPN connection and the customer gateway. For more information, see Use Limits.

    How many VPN gateways and VPN tunnels can I create?

    The creation limit varies depending on the resources. For more information, see Quota Limit. To increase the limit, please submit a ticket.

    How do I ensure the network quality between a VPC and a VPN-connected IDC?

    A VPC connects to an IDC through a VPN connection in the public network. Therefore, latency, packet loss, or jitter in the public network may affect the VPN connection. If you require highly stable communication, we recommend that you use Direct Connect.
    Tencent Cloud provides 24-hour monitoring for your VPN gateways and reports alarms for exceptions. OPS personnel are available for emergencies. You can also monitor the traffic of your VPN gateways and tunnels in the console in real time. If exceptions occur, submit a ticket.

    Can I access the Internet through a VPN connection?

    No. VPN gateways only provide access to VPCs but not to the Internet.

    Can I use VPN Connections without a public IP?

    If you use an IPsec VPN connection, you must have a public IP. If you don't have a public IP, you can try using an SSL VPN connection to connect your LAN and the cloud environment. To check whether an SSL VPN connection can meet your requirements, see Directions.
    Using an IPSec VPN connection requires the customer gateway to have a fixed IP address.
    An SSL VPN gateway doesn't require that the customer gateway have a fixed public IP address. It is an egress gateway through which the VPC establishes an SSL VPN connection and is used together with the SSL VPN client (mobile client). For more information, see Directions.

    What is a customer gateway?

    A customer gateway is a logical object that records the VPN gateway on the edge of the peer IDC.

    What is an SPD policy? Why do I need to configure the local and peer IP ranges?

    A Security Policy Database (SPD) policy consists of a series of SPD rules that determine the IP ranges in a VPC or CCN and the IP ranges in an IDC that can communicate with each other. Therefore, the local and peer IP ranges must be configured for an SPD policy. The local gateway settings specify the IP ranges of the Tencent Cloud VPN gateway. The IP ranges cannot overlap with each other. The customer gateway settings specify the public network IP ranges of the local customer gateway that is interconnected with Tencent Cloud.

    What is an SSL VPN client?

    An SSL VPN client is a VPN client that is deployed on user terminals and is considered a logical instance on Tencent Cloud.
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