Often software developers can benefit from having skills typically found in IT support engineers. For example I occasionally bring small embedded systems home from work since it makes working from home more productive. It's hard to physically reconfigure equipment I've left at the office and the reset button is tough to hit across a VPN.
In this scenario I need to be able to access the small embedded system on our home LAN as well as my build desktop machine which stays at work. Having a VPN client which supports split tunneling makes this possible. It requires that there be no overlap in IP addresses between the two LANs. It also requires that I change the static IP address on the equipment I bring home to match the subnet which my home router uses.
The diagram gives a rough idea of how the split tunneling works.
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