OpenVPN slow with Firewall enabled on Zyxel ZyWall USG-100

Posted by aleroot on Server Fault See other posts from Server Fault or by aleroot
Published on 2013-10-17T21:10:46Z Indexed on 2013/10/17 21:58 UTC
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Filed under:

firewall

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openvpn

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zyxel

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zywall

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 :

FireWall Rule

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 ?

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