IPSec with remote subnet that's also another local subnet

[cukal]

Hi All,

I while back I asked: https://forum.netgate.com/topic/136548/multiple-ipsec-with-same-remote-subnets but now I'm facing another question I can't wrap my head around how to accomplish it without the prospect of blowing things up, suppose this setup:

Local_LAN_1
Local_LAN_2 <-- IPSec P2 --> Remote_LAN

The Remote_LAN is the same subnet as Local_LAN_1 or has an overlapping subnet with Local_LAN_1.

Is that even possible? How does the routing in that case work? Does Local_LAN_2 now loose connectivity to Local_LAN_1 or will it never reach Remote_LAN?

Thanks for any light shed!
Cukal