Wireguard on a specific WAN with mwan3

[kinhsman]

I have two ISP uplinks and running mwan3 failover mode. wan is active uplink and wanb is standby. I would like to set up my Wireguard VPN (full tunnel to a VPS running wireguard server) using wanb only. So I configured mwan3 to send all traffic match the wireguard traffic (via its source port) to be routed via wanb only:

The problem: wireguard traffic is always sourced from wan instead of wanb. I have validated this by checking the VPS, the public IP its coming from is from wan

Question: What am I missing? Has anyone come across this?
Thank you!

[ZOzo]

metric to be set somewhere in openwrt

[kinhsman]

This is not about the metric. I have them set correctly. I have tested with a LAN client and mwan3 is working correctly for traffic sourced from a LAN client. In this case, wireguard traffic is sourced from the router itself.

[ZOzo]

is you wireguard interface sharing your lan interface or set individually with its own firewall rule?

[kinhsman]

It is sharing the lan zone with lan interface:

[ZOzo]

set it in a different zone and configure your firewall accordingly for it to use the wan you wish

[kinhsman]

I have tried that and it made no effects

[ZOzo]

may be have a look there: Need help making Wireguard Client use specific wan connection - #4 by cesarvog

with note from [vgaetera]

[kinhsman]

that works. you are a life saver ! thank you!