Ah, so more likely then it's not a conflict but that your ISP is handing you a technically invalid gateway that's outside the WAN subnet, which is only a single address. Fun.

There is an option to allow that for providers who decide to ignore the standards. In System > Routing > Gateways edit the dhcp gateway and set 'Use non-local gateway' in the advanced section.

Steve

For anyone who is interested (n00b here), i got it to work (branch to pfsense only):

Phase 1 remote subnet on pfsense has to be 0.0.0.0 with responder only option checked.

on Huawei Side, the following command had to be configured:

the result is:

22accdc1-de10-456f-beb1-06c813df2382-image.png

The problem now is that pfsense does not direct traffic with destination to remote subnet (i.e. 10.2.20.0) through IPSec, it uses WAN0 for that. any ideas?

[update] working now, was pinging from the wrong device.