Great piece of software, working like a charm.
Very easy to use opennhrp
It was a little trick to get it working with ipsec-tools alpha version , but in the end it worked just fine. Here is the software we used to create a encripted tunnel with a working "multicast-enabled-VPN" : Kernel: linux-2.6.32-5 , (CONFIG_ARPD=y), (modules loaded: xfrm4_tunnel, authenc, xfrm4_mode_tunnel;) Multicast Sofware: quagga-0.99.16, qpimd-0.161. VPN Software: ipsec-tools 0.8-alpha20090903, opennhrp-0.11.2