Since Pakistan appears unable and/or unwilling to curtail Al Qaeda/Taliban military activities within its territory which are directed at American/NATO troops in Afghanistan, I advocate the introduction of Indian troops into Afghanistan to ensure that no more attacks are carried from Pakistan into Afghanistan. An Indian Western Theater of Operations ought to be created composed of at least 240,000 Indian troops (the number of troops that US Army Chief of Staff General Eric Shinseki told the US Senate in 2002 that would be required to stabilize Iraq) whose mission is to stabilize Afghanistan through a two front strategy against Pakistan. I believe that India would be open to provide this kind of military assistance to the United States and NATO forces if India was asked.
India is the only regional power with the military forces capable of doing this. The anvil of India & Kashmir to the east of Pakistan and the hammer of India's Western Theater Army presents Pakistan with a two front strategic problem--which Pakistan is wholly incapable of dealing with with.
The United States clearly has the capacity to provide the Indians with the logistics support necessary to move and sustain such a force. Consequently, it must do so. India is poised politically and militarily to bring stability into this region which Pakistan has been unable and/or unwilling to do so.
If Pakistan is unable to curtail outside activities within its borders, then India can ensure that there will be no interference from these forces in Afghanistan.