Good Points I 'll take care of these.
My requirements are as follow;
1. Site A has services & Internet Connection with SRX & connected to internet A
2. Site B has limited services & Internet Connection with SRX & connected to internet B but its standby
(Its an Active / Standby )
3. These are connected as Layer 2 & internet as well as alternative link.
There can be couple of scenarios
Primary Firewall (Site A) Goes down now SRX at Site B should perform same function for hosts in Site A vice versa
OR Firewall is ok but Site A internet connection goes down in these cases Site B 's SRX start providing internet services as Site B is connected to a different internet connection.
Layer 2 Link between Site A & B goes down now site B should connect to Site A via internet (can it be a L2TP?).