Issues with PCS

Not sure why the below code doesn't print out the same values three times...

import pcs
from pcs.packets.ethernet import *
from pcs.packets.ipv4 import *
from pcs.packets.tcp import *

def main():
    from optparse import OptionParser

    parser = OptionParser()
    parser.add_option("-i", "--interface",
                      dest="interface", default=None,
                      help="Which interface to use for testing.")
    (options, args) = parser.parse_args()
    sniffer = pcs.PcapConnector(options.interface)
    
    while 1:
        rawPacket = sniffer.read()
        etherPacket = ethernet(rawPacket)
        
        if type(etherPacket.data) == ipv4:
            ipv4Packet = ipv4(etherPacket.data.getbytes())
            
            if type(ipv4Packet.data) == tcp:
                tcpPacket = tcp(ipv4Packet.data.getbytes())
                
                print etherPacket.data.data
                print ipv4Packet.data
                print tcpPacket
        print '-------------------------------------'

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