NATO's spokesman in Kabul, Mark Laity, said the alliance wants to consider the "practicality and morality" of the plan, which has already drawn criticism from Afghanistan and the UN.
Pakistan proposed the security measures to restrict the movement of militants across the border, following Afghan accusations that Pakistan has failed to curb cross-border attacks.
In Brussels today, NATO Secretary-General Jaap de Scheffer called on Pakistan to crack down on militants crossing the border into Afghanistan.
He also offered NATO help to Pakistan to make the border more watertight.
A NATO official said the alliance could provide "surveillance and protection equipment."
(AFP)