Recently I've deployed NSX Manager for NSX-T 3.0 testing.
As usually I set up static IP, mask and gateway while deploying Manager in configuration step.
Then I try to connect to Web UI but I can't. Appliance doesn't have internet access. Ping form the VM doesn't work.
Also I deployed NSX-T 2.5.1 Manager with the same IP, mask and gateway and it works.
If I set interface setting to DHCP in /etc/network/interface the internet connection appear and I can connect to Web UI. If I set the same setting which DHCP gived but in static mode then internet disappear again.