Suppose you have a LAN on 192.168.$W.0/24, and from there you connect to
other subnets via VPN: 192.168.$X.0/24, 192.168.$Y.0/24, 192.168.$Z.0/24
... your Ethernet interface sets the route to the $W subnet when it's
brought up. Could you set a single route to 192.168.0.0/16 pointing to
the VPN gateway?
Oh yeah, the VPN gateway is another host on the $W subnet.
My theory here is that the $W route will take priority, and that the
catchall /16 route will grab all the $X, $Y and $Z traffic. Do I need to
use iproute2 to set routing priority, or will this work with good 'ol
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