diff --git a/ipv6/main_test.go b/ipv6/main_test.go
deleted file mode 100644
index 6ae53bb..0000000
--- a/ipv6/main_test.go
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ipv6_test
-
-import (
-	"flag"
-	"fmt"
-	"os"
-	"os/exec"
-	"runtime"
-	"strings"
-	"testing"
-)
-
-func TestMain(m *testing.M) {
-	flag.Parse()
-	if runtime.GOOS == "darwin" {
-		vers, _ := exec.Command("sw_vers", "-productVersion").Output()
-		if string(vers) == "10.8" || strings.HasPrefix(string(vers), "10.8.") {
-			fmt.Fprintf(os.Stderr, "# skipping tests on OS X 10.8 to avoid kernel panics; golang.org/issue/17015\n")
-			os.Exit(0)
-		}
-	}
-	os.Exit(m.Run())
-}
diff --git a/ipv6/multicast_test.go b/ipv6/multicast_test.go
index 1647375..69a21cd 100644
--- a/ipv6/multicast_test.go
+++ b/ipv6/multicast_test.go
@@ -29,15 +29,15 @@
 
 func TestPacketConnReadWriteMulticastUDP(t *testing.T) {
 	switch runtime.GOOS {
-	case "freebsd": // due to a bug on loopback marking
-		// See http://www.freebsd.org/cgi/query-pr.cgi?pr=180065.
-		t.Skipf("not supported on %s", runtime.GOOS)
 	case "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
 		t.Skip("ipv6 is not supported")
 	}
+	if !nettest.SupportsIPv6MulticastDeliveryOnLoopback() {
+		t.Skipf("multicast delivery doesn't work correctly on %s", runtime.GOOS)
+	}
 	ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagMulticast|net.FlagLoopback)
 	if ifi == nil {
 		t.Skipf("not available on %s", runtime.GOOS)
@@ -129,15 +129,15 @@
 
 func TestPacketConnReadWriteMulticastICMP(t *testing.T) {
 	switch runtime.GOOS {
-	case "freebsd": // due to a bug on loopback marking
-		// See http://www.freebsd.org/cgi/query-pr.cgi?pr=180065.
-		t.Skipf("not supported on %s", runtime.GOOS)
 	case "nacl", "plan9", "windows":
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if !supportsIPv6 {
 		t.Skip("ipv6 is not supported")
 	}
+	if !nettest.SupportsIPv6MulticastDeliveryOnLoopback() {
+		t.Skipf("multicast delivery doesn't work correctly on %s", runtime.GOOS)
+	}
 	if m, ok := nettest.SupportsRawIPSocket(); !ok {
 		t.Skip(m)
 	}