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TCP Accelerator

TCP Acceleration Enable

TCP Accelerator can be enabled through Wanos Web UI. Navigate to Configure > System Settings > Optimization Settings.

The TCP Accelerator is an optional feature that can be enabled on the Wan Accelerator to significantly enhance performance when sending TCP traffic over suboptimal network conditions or to improve TCP performance of slow TCP stack implementations. TCP Acceleration is typically used to improved application performance and user experience over VPN, SD-WAN and long delay networks. TCP Acceleration can also significantly improve Backup, Replication and Storage traffic over MPLS WAN links.

The TCP Accelerator can be used as a standalone TCP Performance enhancing proxy (TCP-PEP). A typical use cases are satellite hub sites or Wireless ISPs (WISP). For enterprises the TCP Acceleration can be enabled at both remote and central sites.

Routing requirements

Starting from v.4.2.9 Layer 2 support was added for the TCP Accelerator in full transparency mode and deployment in bridge mode. In this scenario, which are the default settings for TCP-X and deployment mode, it is no longer required to add routing configuration. Prior to v.4.2.9 in bridge deployment, TCP-X still required to find source and destinations via the routing table.

For versions v.4.2.8 and earlier, TCP-X may need additional routing configuration. A simple branch office with a single subnet e.g. would not need any additional route configuration since the default gateway is the only route out the network. For Head Offices and Satellite Hub sites that breakout to the Internet or connect to other network segments a different approach is needed. In these scenarios configure the Internet breakout router as the default gateway and add a secondary route for the Internal subnets to route via the Internal WAN routers. Below is a configuration example of two 192.168.x.0/24 branch sites with WAN Router as gateway, while the default gateway is to access the Internet. The objective of adding routes is to ensure the bridge appliance can reach all the required source and destination networks.

TCP-X Route example

TCP-X Policies

By default, when TCP-X is enabled, all TCP sessions will be optimized. To control which TCP traffic to optimize, for example between branch and head office, TCP-X policies can be added to include and exclude. Source is from the LAN side and Destination is on the WAN side. Optionally a TCP port can be specified in the rule e.g. port 22


TCP-X Route example

For an overview of how the TCP Acceleration feature works, please see the TCP Acceleration Overview.

Information on how to Troubleshoot TCP Accelerator.

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