diff --git a/ipv6/bpf_test.go b/ipv6/bpf_test.go
index e249e1c..c43ddd0 100644
--- a/ipv6/bpf_test.go
+++ b/ipv6/bpf_test.go
@@ -19,8 +19,8 @@
 	if runtime.GOOS != "linux" {
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
-	if !nettest.SupportsIPv6() {
-		t.Skip("ipv6 is not supported")
+	if _, err := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback); err != nil {
+		t.Skip("ipv6 is not enabled for loopback interface")
 	}
 
 	l, err := net.ListenPacket("udp6", "[::1]:0")
diff --git a/ipv6/readwrite_test.go b/ipv6/readwrite_test.go
index e8db119..131b190 100644
--- a/ipv6/readwrite_test.go
+++ b/ipv6/readwrite_test.go
@@ -223,10 +223,10 @@
 	case "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
-	if !nettest.SupportsIPv6() {
-		t.Skip("ipv6 is not supported")
+	ifi, err := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
+	if err != nil {
+		t.Skip("ipv6 is not enabled for loopback interface")
 	}
-
 	c, err := nettest.NewLocalPacketListener("udp6")
 	if err != nil {
 		t.Fatal(err)
@@ -236,7 +236,6 @@
 	defer p.Close()
 
 	dst := c.LocalAddr()
-	ifi, _ := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
 	cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
 	wb := []byte("HELLO-R-U-THERE")
 
diff --git a/ipv6/sockopt_test.go b/ipv6/sockopt_test.go
index 3305cfc..ab0d2e4 100644
--- a/ipv6/sockopt_test.go
+++ b/ipv6/sockopt_test.go
@@ -20,8 +20,9 @@
 	case "fuchsia", "hurd", "js", "nacl", "plan9", "windows", "zos":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
-	if !nettest.SupportsIPv6() {
-		t.Skip("ipv6 is not supported")
+
+	if _, err := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback); err != nil {
+		t.Skip("ipv6 is not enabled for loopback interface")
 	}
 
 	ln, err := net.Listen("tcp6", "[::1]:0")
@@ -53,8 +54,8 @@
 	case "fuchsia", "hurd", "js", "nacl", "plan9", "windows", "zos":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
-	if !nettest.SupportsIPv6() {
-		t.Skip("ipv6 is not supported")
+	if _, err := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback); err != nil {
+		t.Skip("ipv6 is not enabled for loopback interface")
 	}
 
 	ln, err := net.Listen("tcp6", "[::1]:0")
diff --git a/ipv6/unicast_test.go b/ipv6/unicast_test.go
index fe1d44d..e03c2cd 100644
--- a/ipv6/unicast_test.go
+++ b/ipv6/unicast_test.go
@@ -23,8 +23,8 @@
 	case "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
-	if !nettest.SupportsIPv6() {
-		t.Skip("ipv6 is not supported")
+	if _, err := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback); err != nil {
+		t.Skip("ipv6 is not enabled for loopback interface")
 	}
 
 	c, err := nettest.NewLocalPacketListener("udp6")
diff --git a/ipv6/unicastsockopt_test.go b/ipv6/unicastsockopt_test.go
index ac0daf2..c3abe2d 100644
--- a/ipv6/unicastsockopt_test.go
+++ b/ipv6/unicastsockopt_test.go
@@ -19,8 +19,8 @@
 	case "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
-	if !nettest.SupportsIPv6() {
-		t.Skip("ipv6 is not supported")
+	if _, err := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback); err != nil {
+		t.Skip("ipv6 is not enabled for loopback interface")
 	}
 
 	ln, err := net.Listen("tcp6", "[::1]:0")
@@ -64,8 +64,8 @@
 	case "fuchsia", "hurd", "js", "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
-	if !nettest.SupportsIPv6() {
-		t.Skip("ipv6 is not supported")
+	if _, err := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback); err != nil {
+		t.Skip("ipv6 is not enabled for loopback interface")
 	}
 
 	ok := nettest.SupportsRawSocket()
diff --git a/nettest/nettest.go b/nettest/nettest.go
index 6918f2c..3d970bf 100644
--- a/nettest/nettest.go
+++ b/nettest/nettest.go
@@ -34,12 +34,10 @@
 )
 
 func probeStack() {
-	if ln, err := net.Listen("tcp4", "127.0.0.1:0"); err == nil {
-		ln.Close()
+	if _, err := RoutedInterface("ip4", net.FlagUp); err == nil {
 		ipv4Enabled = true
 	}
-	if ln, err := net.Listen("tcp6", "[::1]:0"); err == nil {
-		ln.Close()
+	if _, err := RoutedInterface("ip6", net.FlagUp); err == nil {
 		ipv6Enabled = true
 	}
 	rawSocketSess = supportsRawSocket()