When do I realize that I am free from rebirth? By following the Buddha's Path, when will I realize that I am free from rebirth and suffering? Is there any indication or sign ? Does one knows it at one's death bed?
From Milindapanha:


  The king said, “Is there anyone who is not reborn
  after death?”
   “Yes there is. The one who has no defilements is not
  reborn after death; the one who has defilements is reborn.”
   “Will you be reborn?”
   “If I die with attachment in my mind, yes; but if not,
  no.”  


...


  He who is reborn, Nàgasena, is he the
  same person or another?”
  “Neither the same nor another.  


...  


  “Is the man who will not be reborn aware of the fact?”
  “Yes, O king.”
  “How does he know it?”
  “By the cessation of all that is cause or condition of
  rebirth. As a farmer who does not plough or sow or reap
  would know that his granary is not getting filled up.”


...


  What is it, Nàgasena, that is reborn?”
  “Mind and matter (namarupa).”
  “Is it this very mind and matter that is reborn?”
  “No, it is not, but by this mind and matter deeds are
  done and because of those deeds another mind and matter
  is reborn; but that mind and matter is not thereby released
  from the results of its previous deeds.


...


  “Does he who will not be reborn feel any painful
  feeling?”
  “He may feel physical pain, O king, but not mental
  pain.”
  “If he feels painful feelings then why doesn’t he just
  die and attain the extinction of grasping, and put an end to
  suffering?”
  “The arahant has no fondness for or aversion to life...  


...


  “Will you, Nàgasena, be reborn?”
  “What is the use of asking that question again? Have
  I not already told you that if I die with attachment in my
  mind I shall be reborn, if not I shall not.”


...


  “Would he who is about to be reborn know it?”
  “Yes he would, just as a farmer who puts seed into the
  ground, seeing it rain well, would know that a crop will be
  produced.”


So, do you feel that you still have attachments, mental or emotional? That's how you know.