I have two routers connected to two different ISPs. On LAN side both the routers are connected to two L3 switches. On L3 switches users/web servers are connected. I have APNIC IP addresses and AS number with me.
Both ISPs will provide me default a route instead of full routing table.
Now I want to load share incoming as well outgoing traffic among both ISPs.
I have a doubt; if somehow I achieve load sharing for out/in traffic, is it mandatory for a user request go out of one ISP and the acknowledgement coming back via same ISP? Or it can go through one ISP and come back through other ISP?