diff -Nruw ../scapy-2.1.0-orig/scapy/config.py ./scapy/config.py
--- ../scapy-2.1.0-orig/scapy/config.py	2010-12-18 14:10:38.000000000 +1300
+++ ./scapy/config.py	2010-12-18 14:11:39.000000000 +1300
@@ -366,7 +366,7 @@
     netcache = NetCache()
     load_layers = ["l2", "inet", "dhcp", "dns", "dot11", "gprs", "hsrp", "inet6", "ir", "isakmp", "l2tp",
                    "mgcp", "mobileip", "netbios", "netflow", "ntp", "ppp", "radius", "rip", "rtp",
-                   "sebek", "skinny", "smb", "snmp", "tftp", "x509", "bluetooth", "dhcp6", "llmnr" ]
+                   "sebek", "skinny", "smb", "snmp", "tftp", "x509", "bluetooth", "dhcp6", "llmnr", "carp" ]
     
 
 if not Conf.ipv6_enabled:
diff -Nruw ../scapy-2.1.0-orig/scapy/layers/carp.py ./scapy/layers/carp.py
--- ../scapy-2.1.0-orig/scapy/layers/carp.py	1970-01-01 12:00:00.000000000 +1200
+++ ./scapy/layers/carp.py	2010-12-18 14:36:29.000000000 +1300
@@ -0,0 +1,61 @@
+from scapy.packet import *
+from scapy.layers.inet import IP
+from scapy.fields import BitField, ByteField, XShortField, IntField, XIntField
+from scapy.utils import checksum
+import struct, hmac, hashlib
+
+class CARP(Packet):
+    name = "CARP"
+    fields_desc = [ BitField("version", 4, 4),
+        BitField("type", 4, 4),
+        ByteField("vhid", 1),
+        ByteField("advskew", 0),
+        ByteField("authlen", 0),
+        ByteField("demotion", 0),
+        ByteField("advbase", 0),
+        XShortField("chksum", 0),
+        XIntField("counter1", 0),
+        XIntField("counter2", 0),
+        XIntField("hmac1", 0),
+        XIntField("hmac2", 0),
+        XIntField("hmac3", 0),
+        XIntField("hmac4", 0),
+        XIntField("hmac5", 0)
+    ]
+
+    def post_build(self, pkt, pay):
+        if self.chksum == None:
+            pkt = pkt[:6] + struct.pack("!H", checksum(pkt)) + pkt[8:]
+
+        return pkt
+
+def build_hmac_sha1(pkt, pw = '\0' * 20, ip4l = [], ip6l = []):
+    if not pkt.haslayer(CARP):
+        return None 
+
+    p = pkt[CARP]
+    h = hmac.new(pw, digestmod = hashlib.sha1)
+    # XXX: this is a dirty hack. it needs to pack version and type into a single 8bit field
+    h.update('\x21')
+    # XXX: mac addy if different from special link layer. comes before vhid
+    h.update(struct.pack('!B', p.vhid))
+
+    sl = []
+    for i in ip4l:
+        # sort ips from smallest to largest
+        sl.append(inet_aton(i))
+    sl.sort()
+
+    for i in sl:
+        h.update(i)
+
+    # XXX: do ip6l sorting
+
+    return h.digest()
+
+"""
+XXX: Usually CARP is multicast to 224.0.0.18 but because of virtual setup, it'll 
+be unicast between nodes. Uncomment the following line for normal use
+bind_layers(IP, CARP, proto=112, dst='224.0.0.18')
+"""
+bind_layers(IP, CARP, proto=112)
Binary files ../scapy-2.1.0-orig/scapy/layers/.carp.py.swp and ./scapy/layers/.carp.py.swp differ