virtualbox.org

I have Windows 7 host, installed VBox 5.0.10 and RHEL6 Linux guest VM. Network adapter 1 on VM is setup in bridged mode. Host and guest get public (128.x.x.x) IP. Adapter 2 is setup in host-only, both are working fine. I have a linux cluster on a private network (172.x.x.x) and would like my Linux VM to to have direct access to this cluster. I installed a second NIC card in a PCIe slot. The Windows host recognizes it and gets an 172.x.x.x IP, can communicate with the Linux cluster, Linux VM can't. I want only Linux VM to have exclusive access to the second NIC. Is that possible? How?

Uncheck all but Virtualbox bindings on the second NIC properties. (There was a glitch with version 5 which also required leaving the IP4 binding checked, don't know if that's fixed by now, it wasn't required before and caused some consternation on the forums, I believe it was recognized as a bug.)