The "IPSec passthroug" section at the end of that page (https://lede-project.org/docs/user-guide/firewall_configuration#ipsec_passthrough) seems pretty straightforward.
The "IPSec passthroug" section at the end of that page (https://lede-project.org/docs/user-guide/firewall_configuration#ipsec_passthrough) seems pretty straightforward.