Routes getting re-written incorrectly on macos

[laduke]

after some time, the route's interface gets changed from zerotier's feth device to a physical device enX.

I'm still trying to reproduce it. It could be zerotier-one, macos, or some other service fiddling with the routes.

Restarting zerotier fixes the routes.

example netstat

# netstat -rn

Internet:
Destination        Gateway            Flags               Netif Expire
default            192.168.36.1       UGScg                 en0       
…
192.168.9.20/32    172.17.2.2         UGSc             feth4913       
192.168.10.11/32   172.17.2.2         UGSc                  en0       
192.168.10.103/32  172.17.2.2         UGSc             feth4913       
192.168.36         link#15            UCS                   en0      !