def _makeHeaderIPv4(sig=V2_SIGNATURE, verCom='!', famProto='\x11', addrLength='\x00\x0c', addrs='\x7f\x00\x00\x01\x7f\x00\x00\x01', ports='\x1f\x90"\xb8'):
 return (((((sig + verCom) + famProto) + addrLength) + addrs) + ports)

def _makeHeaderIPv4 ( sig = V2_SIGNATURE , verCom = '!' , famProto = '\x11' , addrLength = '\x00\x0c' , addrs = '\x7f\x00\x00\x01\x7f\x00\x00\x01' , ports = '\x1f\x90"\xb8' ) : return ( ( ( ( ( sig + verCom ) + famProto ) + addrLength ) + addrs ) + ports )
construct a version 2 ipv4 header with custom bytes .