David Crawshaw 9258d64261 wgengine/router: do not call ifconfig up if SetRoutesFunc is set
The NetworkExtension brings up the interface itself and does not have
access to `ifconfig`, which the underlying BSD userspace router attempts
to use when Up is called.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
2020-06-26 09:45:28 -07:00
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