OpenVPN slow with Firewall enabled on Zyxel ZyWall USG-100
- by aleroot
I have an OpenVPN server on a Linux machine, after installing a ZyWall USG-100 I'm experiencing extremely slowness navigating web servers on my remote LAN through the VPN connection, while accessing the web interface of the ZyWall is fast.
I have configured everything : the Virtual Server for the OpenVPN Server, the static route as with the replaced router that I had before installing the ZyWall Today.
I even added a rule to the firewall that allows connection to the OpenVPN Server machine :
but navigation on the LAN through the VPN still slow, it seems that the Firewall is blocking packages, since if I disable the firewall on the USG-100 everything works fast as usual, while with the firewall enabled it is extremely slow.
Why ? Do I need to add some other rule to the firewall to speed up ?