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Document NAT subnet change procedure (#236)

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Nikolay Edigaryev 2022-09-08 16:26:40 +04:00 committed by GitHub
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@ -268,3 +268,21 @@ This invocation calls the `tart pull` implicitly (if the image is not being pres
Tart is limited by functionality of Apple's `Virtualization.Framework`. At the moment `Virtualization.Framework`
doesn't support nested virtualization.
</details>
<details>
<summary>Changing the default NAT subnet</summary>
To change the default network to `192.168.77.1`:
```
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.vmnet.plist Shared_Net_Address -string 192.168.77.1
```
Note that even through a network would normally be specified as `192.168.77.0`, the [vmnet framework](https://developer.apple.com/documentation/vmnet) seems to treat this as a starting address too and refuses to pick up such network-like values.
The default subnet mask `255.255.255.0` should suffice for most use-cases, however, you can also change it to `255.255.0.0`, for example:
```
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.vmnet.plist Shared_Net_Mask -string 255.255.0.0
```
</details>