Limit total data usage by gateway

[duckypoos]

Hi,

I have been using OPNsense for about 6 months but looking to do more with it now.

On site we have the following WAN connections, which are all configured and working but I need a little more control over them: -

 - 1 x DSL link 16/1 (unlimited data)
 - 2 x 3g/4g link 36/16 (limited to 20gb per month)

Is there some way to use traffic shaping or accounting to prevent us going over the 20gb limit on the two 3g/4g links?  The data charges from the provider for going over the 20gb limit are horrendous. I really want a way to "set and forget" some round robin weightings or something so we can make best use of those other two connections because the upload speeds on the 3g/4g links is a real benefit.  Jumping into the firewall config every time just for an upload session or when we need to split the bandwidth up a bit more is a bit of a bind.

Utopian vision is to have this configured so that if/when we hit the monthly limit, it just drops the 3g/4g link out of whichever gateway groups until the next accounting period.

Thanks!
Duck