I will preference this with I have very basic networking skills and i am trying to learn NSX. I have a lab where i have installed NSX-T 2.5 on two hosts. I have successfully deployed two segments and a Tier-1 gateway and i can get those segments to talk to each other. I am now trying to get these segments to talk out and to the internet. I will also need to access the VMs on these segments from an "external" IP.
I will have a series of VMs in a "pod" and would like to have 1 external IP assigned to this pod of VMs that i could access from this "external" IP and forward various ports to various VMs for connectivity. I am a little lacking in the terminology but is it possible to deploy a Tier-0 gateway for my pods segments that has an uplink(via an edge node?) of an "external" IP that i can then have my VMs access the internet and forward my ports to the VMs?
By "external" IP, i have a network in the lab that is available to my ESXi guests that i can access without anything in the way. It would be an IP on this network that i would like as my external IP for the segments.
The Tier-0 router is exactly for that, connecting the virtual network (overlay segments) to the physical network through its uplinks. You can also use NAT if you want this connectivity without exposing overlay IPs.