What is the purpose of a Vector Map?

Link Aggregation > Vector Maps
When performing one-to-one or one-to-many NAT you MUST create a reverse NAT rule to ensure that traffic goes out the same interface it came in on when in a load balancing mode, i.e. when two or more WAN links are active and balancing traffic.
Example: web traffic comes in via WAN1 to, the Edge MUST make sure it goes back out on WAN1 or the session will not work, it might work some of the time when it gets balanced out WAN1 but not others when it gets balanced out WAN2.  This is done by creating a vector map for that forces all traffic from back out WAN1.

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