What are the bandwidth limits for AWS Client VPNs.

Question

When connecting to an eu-west-2 AWS Client VPN with the AWS VPN Client we are seeing significantly reduced connection speeds compared to tests without the VPN connected.  
The [docs](https://docs.aws.amazon.com/vpn/latest/clientvpn-admin/troubleshooting.html#test-throughput) state there is a "10 Mbps bandwidth limit per user connection" but this does not match what we are experiencing (some users have around 100Mbps).

What bandwidth is supported by AWS for these services?  
Are there any approaches to improving performance?

Gary Mclean · Accepted Answer

I think the 1.25 Gbps bandwidth is for Site to Site VPNs per tunnel. I cant locate any documentation regarding the AWS VPN Client Limitations

weinsran · Answer

The limit is 1.25 Gbps per VPN tunnel. There is also a maximum packets per second per VPN tunnel of 140k PPS.
The limit is shown on the  [AWS VPN FAQs](https://aws.amazon.com/vpn/faqs/#AWS_Site-to-Site_VPN_connectivity) page.
The VPN bandwidth limit of 1.25 Gbps Per Tunnel means that if you have multiple connections, you can aggregate the bandwidth.

[Transit Gateway](https://docs.aws.amazon.com/vpc/latest/tgw/transit-gateway-quotas.html) supports up to 100 Gbps per VPC attachment per Availability Zone. Each VPN tunnel still has a limit of 1.25 Gbps Per Tunnel but if you use dynamic routing (BGP) you can get 2.5 Gbps per **Connection**.
If you use dynamic routing (BGP), you can create multiple VPN connections that announce the same prefixes and enable Equal Cost Multipath (ECMP) between these connections. By load-balancing traffic over multiple paths, ECMP can increase the total throughput but no single network flow can exceed 1.25 Gbps (unless the application has a way to split the traffic, such as S3 multi-part upload).

Amit · Answer

**Latest Update** 
 Each user connection has a maximum baseline bandwidth of 50 Mbps. The actual bandwidth you experience connecting through a Client VPN endpoint can vary based on several factors. These factors include packet size, traffic composition (TCP/UDP mix), network policies (shaping or throttling) on intermediate networks, internet conditions, application-specific requirements, and the total number of concurrent user connections. **If you are hitting the maximum bandwidth limit, you can request an increase through AWS Support. It depends on the valid use case.**

Please follow for more information:
https://docs.aws.amazon.com/vpn/latest/clientvpn-admin/what-is-best-practices.html

Hari Priya Reddy Maddi · Answer

hello,
 AWS Client VPN has a default bandwidth limit of 1.25 Gbps for each VPN connection. The 10 Mbps limit you mentioned might be a reference to the default bandwidth limit per user connection. AWS Client VPN allows you to define a maximum bandwidth limit for each user connection, and the default is 10 Mbps. However, this can be adjusted based on your requirements.

To check and adjust the bandwidth limit for a user connection, you can follow these steps:

1.Open the AWS Management Console.
    2.Navigate to the Amazon VPC console at https://console.aws.amazon.com/vpc/.
    3.In the navigation pane, choose "Client VPN Endpoints."
    4.Select your Client VPN endpoint.
    5.Choose the "Connections" tab.
    6.Select the user connection for which you want to adjust the bandwidth limit.
    7.Choose the "Details" tab.
    8.In the "User Connection Settings" section, adjust the "Maximum User Connection Bandwidth" as needed.

Keep in mind that other factors can contribute to reduced connection speeds, such as network latency, client device capabilities, and the underlying infrastructure. Here are some general tips for improving performance:

What are the bandwidth limits for AWS Client VPNs.

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