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I have a CentOS VM running using Hyper-V and would like to connect to it through RDP.
I have setup the Hyper-V switch to use an external network through my physical machine's LAN connection.
The VM can utilize the network no problem, but I am unsure what address to tell RDP to connect to.
Because your Hyper-V guest is non-Microsoft it won't have RDP capability out-of-the-box, thus why you can't just "RDP" to it.
If you require to use Microsoft's RDP protocol then you will need to install an RDP server on the guest OS.
Source: https://docs.microsoft.com/en-us/azure/virtual-machines/linux/use-remote-desktop
Although my source is for Azure it rings true for any Hyper-V (and other VM products too) guest.
The source above is suggesting [for Linux at least] to install xrdp which is an open-source RDP server that should allow you to use Windows built-in RDP client (mstsc.exe) to connect to your guest OS. A simple Google for xrdp centos shows a few articles of people who have installed it:
To add and complete my answer in respect to your final question: You will need to connect to the IP or hostname of the guest OS itself. If you do ifconfig on your CentOS terminal then you will see the IP address for your ethx (probably eth0) which you should recognise as your chosen subnet (192.168.x.x, 10.x.x.x etc.).
