in dp_check/dp_check.go [218:226]
func skipNonLoopback(iface net.Interface) error {
if iface.Flags&net.FlagLoopback == 0 {
return fmt.Errorf("interface does not have loopback flag")
}
if iface.Flags&net.FlagUp != net.FlagUp {
return fmt.Errorf("interface is not marked up")
}
return nil
}