Host Only Network Blocked by VPN

[chuckwolber]

Many VPNs, such as Palo Alto GlobalConnect, mask routes in order to avoid split networks. This breaks Host-only Networks on virtual machines.

Once the VPN is connected all of the bridge interfaces used to dynamically mange Host-only Networks are routed through the VPN instead of locally to the virtual machines.

Prior to VirtualBox 7, Host-only Adapters were available, which worked consistently even when a VPN had locked the route table.

Here is an example of what GlobalProtect does to the route tables on Windwos and macOS to avoid split networks.

​https://knowledgebase.paloaltonetworks.com/kCSArticleDetail?id=kA10g000000ClTm

This is particularly troublesome for macOS users because upgrading to Ventura (macOS 13) breaks VirtualBox 6.x, so an upgrade to VirtualBox 7 is required.

[aeichner]

Unfortunately this is something we can not fix. With VBox 7 we have to rely on the vmnet framework provided by Apple and the functionality it provides is extremely limited.

[chuckwolber]

Issue submitted to apple. Issue tracking number - FB11885923.