OpenVPN dropping connection every time interval

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http://unix.stackexchange.com – I have setup OpenVPN. The server is a router running DD-WRT with OpenVPN setup. The client is Ubuntu 12.04. The connection is established without issues. I can ping clients at the VPN side. The problem is every 5-10min (seems slightly variant) the following occurs on the Ubuntu Client: Fri Jan 18 17:01:45 2013 OpenVPN 2.2.1 x86_64-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload 20110424-2 (2.2RC2)] built on Mar 30 2012 Fri Jan 18 17:01:45 2013 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables Fri Jan 18 (HowTos)