--- /dev/null	2018-07-25 16:53:00.000000000 +0800
+++ new/test/jdk/com/sun/jndi/dns/ConfigTests/PortUnreachable.java	2018-07-25 16:53:00.000000000 +0800
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8200151
+ * @summary Tests that when a DNS server is unreachable and an ICMP Destination
+ *          Unreachable packet is received, we fail quickly and don't wait for
+ *          the full timeout interval.  This could be caused, for example, by a
+ *          dead DNS server or a flakey router.
+ * @modules java.base/sun.security.util
+ * @library ../lib/
+ * @run main PortUnreachable
+ */
+
+import javax.naming.CommunicationException;
+import javax.naming.Context;
+import javax.naming.directory.DirContext;
+import javax.naming.directory.InitialDirContext;
+import java.util.Hashtable;
+
+public class PortUnreachable {
+
+    // Port 25 is the SMTP port, used here to simulate a dead DNS server.
+    private static final int PORT = 25;
+
+    public static void main(String[] args) throws Exception {
+        Hashtable<Object, Object> env;
+
+        // initialize test
+        env = DNSTestUtils.initEnv(false, PortUnreachable.class.getName(), args);
+
+        String deadServerUrl = "dns://localhost:" + PORT;
+
+        env.put(Context.PROVIDER_URL, deadServerUrl);
+
+        DirContext ctx = null;
+
+        try {
+            ctx = new InitialDirContext(env);
+
+            // Any request should fail quickly.
+            long startTime = System.currentTimeMillis();
+            try {
+                ctx.getAttributes("");
+            } catch (CommunicationException e) {
+
+                long elapsedTime = System.currentTimeMillis() - startTime;
+
+                Throwable cause = e.getRootCause();
+                if (cause == null
+                        || !(cause instanceof java.net.PortUnreachableException)) {
+                    DNSTestUtils
+                            .debug("Bug 7164518 can cause this failure on mac");
+                    throw e;
+                }
+
+                DNSTestUtils.debug("Elapsed (ms):  " + elapsedTime);
+
+                // Check that elapsed time is under a second.
+                if (elapsedTime < 1000) {
+                    return;
+                }
+
+                throw new RuntimeException(
+                        "Failed: call took " + elapsedTime + " ms");
+            }
+
+            // You're running a DNS server on your SMTP port?
+            throw new RuntimeException(
+                    "Failed: getAttributes succeeded unexpectedly");
+
+        } finally {
+            DNSTestUtils.cleanup(ctx);
+        }
+    }
+}