},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotIpv4, gotIpv6 := IPsSplitV4V6(tt.args.ips)
			if !reflect.DeepEqual(gotIpv4, tt.wantIpv4) {
				t.Errorf("IPsSplitV4V6() gotIpv4 = %v, want %v", gotIpv4, tt.wantIpv4)
			}
			if !reflect.DeepEqual(gotIpv6, tt.wantIpv6) {
				t.Errorf("IPsSplitV4V6() gotIpv6 = %v, want %v", gotIpv6, tt.wantIpv6)
			}
		})
	}
}

// IsIPv4Address returns if ip is IPv4.
func IsIPv4Address(ip string) bool {
	ipa, err := netip.ParseAddr(ip)
	if err != nil {
		return false
	}
	return ipa.Is4()
}

// IPsSplitV4V6 returns two slice of ipv4 and ipv6 string slice.
func IPsSplitV4V6(ips []string) (ipv4 []string, ipv6 []string) {
	for _, i := range ips {
		ip, err := netip.ParseAddr(i)
		if err != nil {
			log.Debugf("ignoring un-parsable IP address: %v", err)

		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)
	}

		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
}

// mock net.InterfaceAddrs to make its unit test become available
var (
	LocalIPAddrs = net.InterfaceAddrs
)