OpenWRT and GRE: Error 806

By Jake Edwards | Saturday, September 12th, 2015 | Permalink | No Comments

Trying to connect to a VPN failed while running behind my OpenWRT router (Chaos Calmer) from a Windows LAN client.

Adding the following software package to the router resolved the issue;

  • kmod-nf-nathelper-extra

The original error was;

806: The VPN connection between your computer and the VPN server could not be completed. The most common cause for this failure is that at least one Internet device (for example, a firewall or a router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) protocol packets. If the problem persists, contact your network administrator or Internet Service Provider.

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