My mate, they'll NEVER, EVER attack for Afghanistan's sake... They aren't idiots... BUT, they might attack to take advantage IF our troops are concentrated on western border, rather than on the eastern border... As such, reasonable number of troops will have to be present on eastern border as a deterrent whilst ops on western border are ongoing... The element of surprise is necessary for a possible Indian attack, as you've mentioned... I fear an attack on LoC...
Well, Actually you are right.
I think our border security is not well planned as per my thoughts. we have deployed 183,000 troops on Afghanistan border, Which i think is "unnecessary" for a country like Afghanistan. Because we are still experiencing infiltration.
I have a Plan. Well, don't know it's limitations but, the Plan is that
We have 2250 km border with Afghanistan, and some 900 km with Iran. Combinaly it makes some 3200 km, Say.
Now if we built border Post at every Km. it will be 3200 border Posts.
Every Post have 12 troops. 3 for left side area (500 meters) surveillance, 3 for right side area (500 meter) surveillance. and 6 for Post duties i.e; 2 LMG operators, and 4 for Assault and other duties (including sniper) .
But every 5th Post, will have 40 soldiers. for assisting near posts and other major Purposes (including Heavy Artillery ), and Home for surveillance drones .
IN that way we will have combination like 2560 random border posts and 640 heavy posts.
troops count become
2560 x 12 = 30,720
640 x 40 = 25,600
Now built 5 militarry Bases (for both ARMY and PAF use ) on Iran and Afghanistan borders in such a way that 3 bases with Afghanistan border , 1 for Iran border, and 1 in middle (for both Iran and Afghanistan borders) . Bases Having Tanks, APC's, MRAP's, Humvees type vehicles, Helis (Attack and Transport), Armed Drones, Heavy Artillery Units, and Fighter Jets (optional) .
Each military base having 5000 troops. so
5 x 5000 = 25,000
While 10,000 troops and Officers in Command, Supply, and other miscellaneous Duties.
Our troops Counts becomes 91,320 . Adding Factor of Safety let say it become 95,000. Which is Very Very less then the Current deployed forces ( 183,000) for a Single country like Afghanistan. Now With 95,000 Troops You are Securing both Afghanistan as Well as Iran borders. If you wish you can back these 95,000 troops by 60,000 more troops incase of any emergency. Even with that it will be only 155,000 troops Securing Both Iran and Afghanistan borders.
Now with this Plan, you can even deploy 400,000 troops on Eastern border.
But still, it's just an Idea. and it will have limitations because i am not any military expert . they know better then me.