After the signing of the Durand Line agreement, people went crazy. The Pashtuns set fire to the British Boundary Commission office in the small town of Wana, near the Durand Line, and protests, unrest and instability intensified. The Pashtuns did not want this border, they did not want to be divided between two governments when they were previously governed under one. The British sent 60,000 soldiers, To calm tensions over the agreement.8 Well described by the story of Mary Schons, “[t]hroughout history, colonial troops like the British set limits that create great tensions for the people who lived in the colony” – because of the lack of British consideration of how they influenced the tribal areas that lived in the area where the Durand Line was cut. 9 Pakistan inherited the 1893 agreement and the 1919 Treaty of Rawalpindi, after the partition of British India in 1947. There has never been a formal agreement or ratification between Islamabad and Kabul.  Pakistan is of the view, and the International Convention on Legal Uti Possidetis supports the position that it should not require agreement on the border line;  The courts of several countries around the world and the Vienna Convention have generally confirmed by legal uti possidetis that binding bilateral agreements are “transmitted” to successor states.  Thus, a unilateral declaration by a party has no effect; Border changes must be done bilaterally.  It is hard to imagine how some kind of negotiation could be conducted if Pakistan is supported by the United States and Afghanistan is not stable enough to find a solution, but from now on, the line is a problem. Families are torn apart, poverty and access to health care are widespread. The line is difficult to manage because it is partly very robust, and there are always people crossing illegally (since you need a visa to Pakistan with Afghan nationality and a visa versa). This movement across the border is not always necessarily “negative” because some families are literally half on one side of the line and half on the other.
But there are also movements across the border that are harmful, such as the Taliban insurgent movement, which uses Pakistan as an intermediary, movements of drugs, weapons and ammunition at the regulated bulk “border”.