NeedHelp: I want to create on normally working OpenWrt an additional wifi which is connected through IPSecVPN with different Public IP and extended routing

Installing and Using OpenWrt Network and Wireless Configuration
4

You need to do Policy Based Routing and you have 3 options:

  1. mwan3 package
  2. pbr package
  3. a set of rules/routes for each internet connection.

However the IPSEC tunnel doesn't exactly work with gateways, so you might hit a wall there and you'll need to reconsider the tunnel option and use Wireguard or OpenVPN.

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