// If capture all DNS option is enabled, we don't need to read from the dns resolve conf. All
	// traffic to port 53 will be captured.
	if c.RedirectDNS && !c.CaptureAllDNS {
		dnsConfig, err := dns.ClientConfigFromFile("/etc/resolv.conf")
		if err != nil {
			log.Fatalf("failed to load /etc/resolv.conf: %v", err)
		}
		c.DNSServersV4, c.DNSServersV6 = netutil.IPsSplitV4V6(dnsConfig.Servers)
	}

	// If capture all DNS option is enabled, we don't need to read from the dns resolve conf. All
	// traffic to port 53 will be captured.
	if c.RedirectDNS && !c.CaptureAllDNS {
		dnsConfig, err := dns.ClientConfigFromFile("/etc/resolv.conf")
		if err != nil {
			return fmt.Errorf("failed to load /etc/resolv.conf: %v", err)
		}
		c.DNSServersV4, c.DNSServersV6 = netutil.IPsSplitV4V6(dnsConfig.Servers)
	}
	return nil
}

var NetworkGatewayTestDNSServers []string

func newClient() (*dnsClient, error) {
	servers := NetworkGatewayTestDNSServers
	if len(servers) == 0 {
		dnsConfig, err := dns.ClientConfigFromFile("/etc/resolv.conf")
		if err != nil {
			return nil, err
		}
		if dnsConfig != nil {
			for _, s := range dnsConfig.Servers {
				servers = append(servers, net.JoinHostPort(s, dnsConfig.Port))
			}

			log.Error("DNS address :53 and not running as root, use default")
			addr = "localhost:15053"
		}
	}

	// We will use the local resolv.conf for resolving unknown names.
	dnsConfig, err := dns.ClientConfigFromFile(resolvConf)
	if err != nil {
		log.Warnf("failed to load %s: %v", resolvConf, err)
		return nil, err
	}

	// Unlike traditional DNS resolvers, we do not need to append the search