Forum Discussion
Hyper-V Default switch IP address range change. Ver 1809 Build 17763.1
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...
Do you have any idea how to get this ip fixed ? Maybe we can run powershell script to change it after reboot ?
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Just tried to update IP on reboot with powershell script, it's ok to keep same IP , but the network doesn't
work for VMs.This is not way.
I haven't actually played around with all of my VM's yet. However - 1903 has fixed one of the Hyper-V Default Switch problems:
The Default Switch would always be set as a public network - this can be disruptive to other connected networks - as I don't trust that the MS Engineers did a good job with how Domain/Private/Public interact.
With 1903 - the Default Switch is not assigned a Network Category. Which is how it should have been to begin with.
It is always going to be a private network - as VM's can only use it to interact with other VM's on the Host and to the Host itself.. an Internal Network. Like I said... I don't trust the engineers to have done the network categories correctly, until now. Took 4 years.
Anyhow, I'm in the middle of updating the VM's on my laptop to 1903 and see what I can do in the Guest Machine.Not at the moment - because there may be changes upcoming to Hyper-V for 1903 - so anything we do now will be made redundant for the next upgrade.... which is very similar to what has been happening since 1511.
The Virtual Machine connected to the Default Switch will also be connecting to 'New' networks for the first time, each time both the Host and Virtual machine boots... changing to a static IP only solves the problem temporarily - as changes to the default switch IP will result in the VM losing connectivity.
The work around I had where I created a new 'custom default switch' and keeping the original default switch along side it worked best, as I just told all the Virtual Machines to ignore the original default switch and just use the custom switch that I configured.The only thing that breaks this is major build upgrades - example: 1511 - 1607 - 1703 - 1803
As well as anything relating to having to reset your network configuration using the Settings UI aka ImmersiveShell.
- 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.
