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A VM with NAT networking makes vmnet install a default route scoped to
its bridge (bridge100) with no gateway. The detector counted it as a
second physical default route and refused to start:
multiple physical default-route interfaces found (bridge100, en0)
Scoped routes cannot simply be dropped: while a VPN holds the default
route, the physical interface keeps only a default route scoped to
itself. That route still names its gateway (flag G). The on-link one
does not, so a physical default route now requires a next-hop gateway.
parseNetstat records a gateway only when the G flag is set; a link#N
gateway column is the interface itself, not a next hop.