diff --git a/src/test/utils/IGMP.py b/src/test/utils/IGMP.py
new file mode 100644
index 0000000..95ce1ec
--- /dev/null
+++ b/src/test/utils/IGMP.py
@@ -0,0 +1,148 @@
+from socket import *
+from struct import *
+from scapy.all import *
+from itertools import *
+
+IGMPV3_REPORT = 0x22
+IGMP_LEAVE = 0x17
+IGMP_EXCLUDE = 0x04
+IGMP_INCLUDE = 0x03
+IGMPV3_ALL_ROUTERS = '224.0.0.22'
+IGMPv3 = 3
+IP_SRC = '1.2.3.4'
+ETHERTYPE_IP = 0x0800
+IGMP_DST_MAC = "01:00:5e:00:01:01"
+IGMP_SRC_MAC = "5a:e1:ac:ec:4d:a1"
+
+class IGMP:
+
+    def __init__(self, mtype = None, group = '', rtype = None, src_list = []):
+        self.version = IGMPv3
+        self.mtype = mtype
+        self.group = group
+        self.src_list= src_list
+        self.rtype = rtype
+
+    def checksum(self, msg):
+        s = 0
+        for i in range(0, len(msg), 2):
+            w = ord(msg[i]) + (ord(msg[i+1]) << 8)
+            c = s + w
+            s = (c & 0xffff) + (c >> 16)
+        return ~s & 0xffff
+
+    def update_igmp_checksum(self, pkt):
+        cs = self.checksum(pkt)
+        #print 'igmp checksum: ' + str(hex(cs))
+        m = []
+        for x in pkt:        
+            m.append(ord(x))
+        higher = (cs >> 8) & 0xff
+        lower = cs & 0xff
+        m[2] = lower
+        m[3] = higher
+        m = pack("%dB" % len(m), *m)
+        return m
+
+    def update_ip_checksum(self, pkt):
+        cs = self.checksum(pkt)
+        #print 'ip hdr checksum: ' + str(hex(cs))
+        m = []
+        for x in pkt:        
+            m.append(ord(x))
+        higher = (cs >> 8) & 0xff
+        lower = cs & 0xff
+        m[10] = lower
+        m[11] = higher
+        m = pack("%dB" % len(m), *m)
+        return m
+
+    def build_ip_hdr(self, s, d):
+        ip_ihl_len = 0x46 #8 bits
+        ip_dscp = 0xc0 #8 bits
+        ip_hdr_total_len = 0x0028 #16 bits
+        ip_id = 0x0000 #16 bits
+        ip_flags = 0x4000 #16 bits
+        ip_ttl = 1 #8 bits
+        ip_protocol = 0x02 #8 bits
+        ip_cs = 0x0000 #16 bits (should filled by kernel but seems not???)
+        #ip_src #32 bits
+        #ip_dst #32 bits
+        ip_options = 0x94040000 #32 bits
+        #total len 24 bytes
+        ip_header = pack('!BBHHHBBH4s4sI', ip_ihl_len, ip_dscp, ip_hdr_total_len,
+                         ip_id, ip_flags, ip_ttl, ip_protocol, ip_cs, inet_aton(s),
+                         inet_aton(d), ip_options)
+        return ip_header
+
+    def dump_packet(self, data):
+        i = 0
+        for x in data:
+            if i == 4:
+                print ''
+                i = 0
+            i += 1
+            sys.stdout.write(' %0.2x' % ord(x))
+        print ''
+
+    def build_igmp(self, msg_type = None, group = None, record_type = None, src_list = None):
+        msg_type = self.mtype if msg_type == None else msg_type
+        group = self.group if group == None else group
+        record_type = self.rtype if record_type == None else record_type
+        src_list = self.src_list if src_list == None else src_list
+        if msg_type == IGMP_LEAVE:
+            pkt = pack('!BBH4s', msg_type, 0, 0, inet_aton(group))
+        elif msg_type == IGMPV3_REPORT:
+            pkt = pack('!BBHHHBBH', msg_type, 0x00, 0x0000, 0x0000, 0x0001, record_type,
+                       0x00, len(src_list))
+            pkt += pack('!4s', inet_aton(group))
+            for a in src_list:
+                pkt += pack('!4s', inet_aton(a))
+        else:
+            print 'unsupported report type: ' + str(msg_type)
+            return None
+        return pkt
+
+    def build_join_msg(self, group = None, record_type = None, src_list = None):
+        return self.build_igmp(msg_type = IGMPV3_REPORT, 
+                               group = group, 
+                               record_type = record_type, 
+                               src_list = src_list)
+
+    def build_leave_msg(self, group = None):
+        return self.build_igmp(msg_type = IGMPV3_REPORT, 
+                               group = group, 
+                               record_type = IGMP_INCLUDE, 
+                               src_list = [])
+
+    def build_ip_igmp(self, 
+                      src = IP_SRC,
+                      msg_type = None, 
+                      group = None, 
+                      record_type = None, 
+                      src_list = None):
+
+        igmp = self.build_igmp(msg_type = msg_type,
+                               group = group,
+                               record_type = record_type,
+                               src_list = src_list)
+        igmp = self.update_igmp_checksum(igmp)
+        ip_hdr = self.build_ip_hdr(src, IGMPV3_ALL_ROUTERS)
+        p = ip_hdr + igmp
+        p = self.update_ip_checksum(p)
+        return p
+
+    def scapify(self, 
+                src = IP_SRC, 
+                msg_type = None,
+                group = None,
+                record_type = None,
+                src_list = None):
+
+        ip_igmp = self.build_ip_igmp(src = src,
+                                     msg_type = msg_type,
+                                     group = group,
+                                     record_type = record_type,
+                                     src_list = src_list)
+        eth = Ether(dst = IGMP_DST_MAC, src = IGMP_SRC_MAC, type = ETHERTYPE_IP)
+        return eth/ip_igmp