How to fix asymmetric routing ?

[Voodoo]

I have to setup bgp peering in a colo which gives us 2 upstream connections e.g. ISP1 & ISP2

So I setup OPNsense with having WAN1 and WAN2 announcing the bgp routes via frr plugin.

If I announce only to one ISP e.g. via WAN1 everything works as expected.

As soon as I announce to both ISP I get asymmetric routing and therefore TCP connections fail.

Is it possible to fix this in OPNsense without putting a dedicated router in front of it ?

Basically I just want OPNsense to be stateless for WAN1 & WAN2.

What are my options ?

[lilsense]

you can use the prepend command to correct this.

[Voodoo]

Little update on this, OPNsense is actually stateless in this regard (state is tracked via floating interface)

Issue was something else with my upstream provider...