Forum Discussion
Hyper-V Default switch IP address range change. Ver 1809 Build 17763.1
Can one confirm IP address range changed to 192.168.X.Y Subnet 255.255.255.240 from 172.X.X.X Also changes the subnet randomly on every Hyper-V services startup. 192.168.X.Y . X can change from 5...
This has been the case for quite some time - and is not isolated to 17763, and stretches to 10240.
(Though earlier issues weren't this exact problem)
The "Hyper-V Virtual Ethernet Adapter" that appears in device manager that appears as "vEthernet (Default Switch)" in Network and Sharing Centre is being deleted and reinstalled each time you shutdown and boot.
You can also check the registry to see the abundant keys that are created and never removed and just linger in HKLM\System\CurrentControl\Services\
If you're suffering from this issue - you should see a ton of {GUID} just under .NETFramework, and a whole bunch more in the VM services section... vmsmp, vmsp, vmsfsf, etc.
VMSMP\parameters\SwitchList contains the current 'Default Switch'
Those GUID under the .NETFramework Key, when expanded will have Tcpip keys for previous switches...
I confirmed that the pair of rules of reception of "DNS Server Forward Rule TCP - XXXXXXXXXXXXXXXX - 0" and "DNS Server Forward Rule UDP - XXXXXXXXXXXXXXXX - 0" increases forever with the influence that the Default Switch is recreated. The "XXXXXXXXXXXXXXXX" is GUID of port of Default Switch that was recreated. If we do not delete wasted rules, will one day overflow?
Host (Right Screen): vEthernet (Main Internal) - 10.0.0.1
Guest (Left Screen)- Static IP. Gateway is Host's Main Internal Switch IP.
IP: 10.0.0.2
Subnet: 255.255.255.0
Gateway: 10.0.0.1
If you need Internet connectivity on the Guest - you need to bridge your Host Machine's Main Internal Switch to an Internet Connection... Highlight Both, Right Click and Bridge. Easiest way to do it.
(Main Internal) Static IP addresses persist through Reboot and Shutdown.
Guest Machines connecting to (Main Internal) will need a Static IP set and these also persist thought Reboot and Shutdown. You will need to host a DHCP server if you don't want to use static.
Nested VM ... you can go 3 deep with Hyper-V.
The Hyper-V Server that will host DHCP will need to spoof Mac-Address. If you don't you'll end up with the same set of IP addresses each time.
Here's better screenshot... NB-TECH and NB-G751JY will always connect to each other after reboot, and vEthernet (Default Switch) is never used.
- This thread is about the default switch, not a new switch you create with a fixed IP address.
