diff --git a/client/tests/kvm/tests/vlan.py b/client/tests/kvm/tests/vlan.py
new file mode 100644
index 0000000..fb2a8d7
--- /dev/null
+++ b/client/tests/kvm/tests/vlan.py
@@ -0,0 +1,186 @@
+import logging, time, re
+from autotest_lib.client.common_lib import error
+import kvm_test_utils, kvm_utils
+
+def run_vlan(test, params, env):
+    """
+    Test 802.1Q vlan of NIC, config it by vconfig command.
+
+    1) Create two VMs.
+    2) Setup guests in 10 different vlans by vconfig and using hard-coded
+       ip address.
+    3) Test by ping between same and different vlans of two VMs.
+    4) Test by TCP data transfer, floop ping between same vlan of two VMs.
+    5) Test maximal plumb/unplumb vlans.
+    6) Recover the vlan config.
+
+    @param test: KVM test object.
+    @param params: Dictionary with the test parameters.
+    @param env: Dictionary with test environment.
+    """
+
+    vm = []
+    session = []
+    vm_ip = []
+    digest_origin = []
+    vlan_ip = ['', '']
+    ip_unit = ['1', '2']
+    subnet = params.get("subnet")
+    vlan_num = int(params.get("vlan_num"))
+    maximal = int(params.get("maximal"))
+    file_size = params.get("file_size")
+
+    vm.append(kvm_test_utils.get_living_vm(env, params.get("main_vm")))
+    vm.append(kvm_test_utils.get_living_vm(env, "vm2"))
+
+    def add_vlan(session, id, iface="eth0"):
+        if session.get_command_status("vconfig add %s %s" % (iface, id)) != 0:
+            raise error.TestError("Fail to add %s.%s" % (iface, id))
+
+
+    def set_ip_vlan(session, id, ip, iface="eth0"):
+        iface = "%s.%s" % (iface, id)
+        if session.get_command_status("ifconfig %s %s" % (iface, ip)) != 0:
+            raise error.TestError("Fail to configure ip for %s" % iface)
+
+
+    def set_arp_ignore(session, iface="eth0"):
+        ignore_cmd = "echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore"
+        if session.get_command_status(ignore_cmd) != 0:
+            raise error.TestError("Fail to set arp_ignore of %s" % session)
+
+
+    def rem_vlan(session, id, iface="eth0"):
+        rem_vlan_cmd = "if [[ -e /proc/net/vlan/%s ]];then vconfig rem %s;fi"
+        iface = "%s.%s" % (iface, id)
+        s = session.get_command_status(rem_vlan_cmd % (iface, iface))
+        return s
+
+
+    def nc_transfer(src, dst):
+        nc_port = kvm_utils.find_free_port(1025, 5334, vm_ip[dst])
+        listen_cmd = params.get("listen_cmd")
+        send_cmd = params.get("send_cmd")
+
+        #listen in dst
+        listen_cmd = listen_cmd % (nc_port, "receive")
+        session[dst].sendline(listen_cmd)
+        time.sleep(2)
+        #send file from src to dst
+        send_cmd = send_cmd % (vlan_ip[dst], str(nc_port), "file")
+        if session[src].get_command_status(send_cmd, timeout = 60) != 0:
+            raise error.TestFail ("Fail to send file"
+                                    " from vm%s to vm%s" % (src+1, dst+1))
+        s, o = session[dst].read_up_to_prompt(timeout=60)
+        if s != True:
+            raise error.TestFail ("Fail to receive file"
+                                    " from vm%s to vm%s" % (src+1, dst+1))
+        #check MD5 message digest of receive file in dst
+        output = session[dst].get_command_output("md5sum receive").strip()
+        digest_receive = re.findall(r'(\w+)', output)[0]
+        if digest_receive == digest_origin[src]:
+            logging.info("file succeed received in vm %s" % vlan_ip[dst])
+        else:
+            logging.info("digest_origin is  %s" % digest_origin[src])
+            logging.info("digest_receive is %s" % digest_receive)
+            raise error.TestFail("File transfered differ from origin")
+        session[dst].get_command_status("rm -f receive")
+
+
+    for i in range(2):
+        session.append(kvm_test_utils.wait_for_login(vm[i],
+                       timeout=int(params.get("login_timeout", 360))))
+        if not session[i] :
+            raise error.TestError("Could not log into guest(vm%d)" % i)
+        logging.info("Logged in")
+
+        #get guest ip
+        vm_ip.append(vm[i].get_address())
+
+        #produce sized file in vm
+        dd_cmd = "dd if=/dev/urandom of=file bs=1024k count=%s"
+        if session[i].get_command_status(dd_cmd % file_size) != 0:
+            raise error.TestFail("File producing failed")
+        #record MD5 message digest of file
+        s, output =session[i].get_command_status_output("md5sum file",
+                                                        timeout=60)
+        if s != 0:
+            raise error.TestFail("File MD5_checking failed" )
+        digest_origin.append(re.findall(r'(\w+)', output)[0])
+
+        #stop firewall in vm
+        session[i].get_command_status("/etc/init.d/iptables stop")
+
+        #load 8021q module for vconfig
+        load_8021q_cmd = "modprobe 8021q"
+        if session[i].get_command_status(load_8021q_cmd) != 0:
+            raise error.TestError("Fail to load 8021q module on VM%s" % i)
+
+    try:
+        for i in range(2):
+            for vlan_i in range(1, vlan_num+1):
+                add_vlan(session[i], vlan_i)
+                set_ip_vlan(session[i], vlan_i, "%s.%s.%s" % \
+                                          (subnet, vlan_i, ip_unit[i]))
+            set_arp_ignore(session[i])
+
+        for vlan in range(1, vlan_num+1):
+            logging.info("Test for vlan %s" % vlan)
+
+            logging.info("Ping between vlans")
+            interface = 'eth0.' + str(vlan)
+            for vlan2 in range(1, vlan_num+1):
+                for i in range(2):
+                    dest = subnet +'.'+ str(vlan2)+ '.' + ip_unit[(i+1)%2]
+                    s, o = kvm_test_utils.ping(dest, count=2,
+                                              interface=interface,
+                                              session=session[i], timeout=30)
+                    if ((vlan == vlan2) ^ (s == 0)):
+                        raise error.TestFail ("%s ping %s unexpected" %
+                                                    (interface, dest))
+
+            vlan_ip[0] = subnet + '.' + str(vlan) + '.' + ip_unit[0]
+            vlan_ip[1] = subnet + '.' + str(vlan) + '.' + ip_unit[1]
+
+            logging.info("Flood ping")
+            def flood_ping(src, dst):
+                # we must use a dedicated session becuase the kvm_subprocess
+                # does not have the other method to interrupt the process in
+                # the guest rather than close the session.
+                session_flood = kvm_test_utils.wait_for_login(vm[src],
+                                                              timeout = 60)
+                kvm_test_utils.ping(vlan_ip[dst], flood=True,
+                                   interface=interface,
+                                   session=session_flood, timeout=10)
+                session_flood.close()
+
+            flood_ping(0,1)
+            flood_ping(1,0)
+
+            logging.info("Transfering data through nc")
+            nc_transfer(0, 1)
+            nc_transfer(1, 0)
+
+    finally:
+        for vlan in range(1, vlan_num+1):
+            rem_vlan(session[0], vlan)
+            rem_vlan(session[1], vlan)
+            logging.info("rem eth0.%s" % vlan)
+
+    # Plumb/unplumb maximal unber of vlan interfaces
+    i = 1
+    s = 0
+    try:
+        logging.info("Testing the plumb of vlan interface")
+        for i in range (1, maximal+1):
+            add_vlan(session[0], i)
+    finally:
+        for j in range (1, i+1):
+            s = s or rem_vlan(session[0], j)
+        if s == 0:
+            logging.info("maximal interface plumb test done")
+        else:
+            logging.error("maximal interface plumb test failed")
+
+    session[0].close()
+    session[1].close()
diff --git a/client/tests/kvm/tests/vlan_tag.py b/client/tests/kvm/tests/vlan_tag.py
deleted file mode 100644
index cafd8fe..0000000
--- a/client/tests/kvm/tests/vlan_tag.py
+++ /dev/null
@@ -1,68 +0,0 @@
-import logging, time
-from autotest_lib.client.common_lib import error
-import kvm_subprocess, kvm_test_utils, kvm_utils
-
-
-def run_vlan_tag(test, params, env):
-    """
-    Test 802.1Q vlan of NIC, config it by vconfig command.
-
-    1) Create two VMs.
-    2) Setup guests in different VLANs by vconfig and test communication by
-       ping using hard-coded ip addresses.
-    3) Setup guests in same vlan and test communication by ping.
-    4) Recover the vlan config.
-
-    @param test: KVM test object.
-    @param params: Dictionary with the test parameters.
-    @param env: Dictionary with test environment.
-    """
-    subnet = params.get("subnet")
-    vlans = params.get("vlans").split()
-
-    vm1 = kvm_test_utils.get_living_vm(env, params.get("main_vm"))
-    vm2 = kvm_test_utils.get_living_vm(env, "vm2")
-
-    timeout = int(params.get("login_timeout", 360))
-    session1 = kvm_test_utils.wait_for_login(vm1, timeout=timeout)
-    session2 = kvm_test_utils.wait_for_login(vm2, timeout=timeout)
-
-    try:
-        ip_cfg_base = "vconfig add eth0 %s && ifconfig eth0.%s %s.%s"
-        ip_cfg_cmd1 = ip_cfg_base % (vlans[0], vlans[0], subnet, "11")
-        ip_cfg_cmd2 = ip_cfg_base % (vlans[1], vlans[1], subnet, "12")
-
-        # Configure VM1 and VM2 in different VLANs
-        ip_cfg_vm1 = session1.get_command_status(ip_cfg_cmd1)
-        if ip_cfg_vm1 != 0:
-            raise error.TestError("Failed to config VM 1 IP address")
-        ip_cfg_vm2 = session2.get_command_status(ip_cfg_cmd2)
-        if ip_cfg_vm2 != 0:
-            raise error.TestError("Failed to config VM 2 IP address")
-
-        # Trying to ping VM 2 from VM 1, this shouldn't work
-        ping_cmd = "ping -c 2 -I eth0.%s %s.%s" % (vlans[0], subnet, "12")
-        ping_diff_vlan = session1.get_command_status(ping_cmd)
-        if ping_diff_vlan == 0:
-            raise error.TestFail("VM 2 can be reached even though it was "
-                                 "configured on a different VLAN")
-
-        # Now let's put VM 2 in the same VLAN as VM 1
-        ip_cfg_reconfig= ("vconfig rem eth0.%s && vconfig add eth0 %s && "
-                          "ifconfig eth0.%s %s.%s" % (vlans[1], vlans[0],
-                                                      vlans[0], subnet, "12"))
-        ip_cfg_vm2 = session2.get_command_status(ip_cfg_reconfig)
-        if ip_cfg_vm2 != 0:
-            raise error.TestError("Failed to re-config IP address of VM 2")
-
-        # Try to ping VM 2 from VM 1, this should work
-        ping_same_vlan = session1.get_command_status(ping_cmd)
-        if ping_same_vlan != 0:
-            raise error.TestFail("Failed to ping VM 2 even though it was "
-                                 "configured on the same VLAN")
-
-    finally:
-        session1.get_command_status("vconfig rem eth0.%s" % vlans[0])
-        session1.close()
-        session2.get_command_status("vconfig rem eth0.%s" % vlans[0])
-        session2.close()
diff --git a/client/tests/kvm/tests_base.cfg.sample b/client/tests/kvm/tests_base.cfg.sample
index 29fe984..f53b3f7 100644
--- a/client/tests/kvm/tests_base.cfg.sample
+++ b/client/tests/kvm/tests_base.cfg.sample
@@ -457,17 +457,21 @@ variants:
             - fmt_raw:
                 image_format_stg = raw
 
-    - vlan_tag:  install setup unattended_install.cdrom
-        type = vlan_tag
+    - vlan:  install setup unattended_install.cdrom
+        type = vlan
         # subnet should not be used by host
-        subnet = 192.168.123
-        vlans = "10 20"
+        subnet = "192.168"
+        vlan_num = 5
+        file_size = 10
+        maximal = 4094
+        listen_cmd = "nc -l %s > %s"
+        send_cmd = "nc %s %s < %s"
         nic_mode = tap
         vms += " vm2"
         extra_params_vm1 += " -snapshot"
         extra_params_vm2 += " -snapshot"
+        kill_vm_vm2 = yes
         kill_vm_gracefully_vm2 = no
-        address_index_vm2 = 1
 
     - ping: install setup unattended_install.cdrom
         type = ping
@@ -1245,7 +1249,7 @@ variants:
 
     # Windows section
     - @Windows:
-        no autotest linux_s3 vlan_tag ioquit unattended_install.(url|nfs|remote_ks) jumbo file_transfer nicdriver_unload nic_promisc multicast mac_change
+        no autotest linux_s3 vlan ioquit unattended_install.(url|nfs|remote_ks) jumbo file_transfer nicdriver_unload nic_promisc multicast mac_change
         shutdown_command = shutdown /s /f /t 0
         reboot_command = shutdown /r /f /t 0
         status_test_command = echo %errorlevel%
