Stop automatic default route generation

[JimIFN]

Hello:

I run a small ISP, and I'm using OPNsense in a failover pair as my core ISP router.  I have some public IP address ranges assigned, and I am announcing them via BGP to my upstreams.  I also receive via BGP default (and some additional) routes.

Currently, in my route table, the kernel route is inserted by the gateways.  This overrides the default route from BGP.  Unfortunately, this means if BGP session drops to a peer, the default route remains in place..but I do NOT want that.  I want my default route managed by BGP.

I tried deleting the gateways, but "bad things" happened.  Is there some way to disable the gateway system, or at least suppress insertion of the default route into the kernel routing table?