Add second NIC to Debian Jessie on Hyper-V 2012 R2

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  • I have a vLAN that I want to monitor some devices on but when I add a second NIC to my Icinga2 host (Debian 8/Jessie) all of the networking stops working.


    I have configured them on separate vLANs but nothing seems to matter. I add the second NIC, all networking goes offline. I remove the second NIC, all networking works correctly.


    Why is all networking going offline when I add a second NIC and what can I do differently to get the second NIC to connect?


    I know it's a little vague, I'm happy to share configs, let me know what you want to see and I'll update the post with the info.


    Thanks!!


    h