Solved: Deploy L3 Switch to Router Network?

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Deploy L3 Switch to Router Network?

We currently have a router on a stick model network (see image). So, any routing between the sub networks are done through the router. This router also acts as our DHCP, PXe, and Firewall server.

The layer 2 switch is actually a layer 3 switch (surprise!). I'd like to enable routing on this switch to utilise the speed of the layer3 switching. I still want the router there to continue serving as the DHCP, PXe, and Firewall.

After adding interfaces to the switch, devices can now route using the L3 switch. I used ip addresses 192.168.10.2, 192.168.20.2, 192.168.30.2. (I tested this by setting up a device to use one of the interfaces on the L3 switch as a default gateway and I could ping everything on the network except for the router's interfaces)

I'll be changing DHCP to give clients a 192.168.X.2 gateway.

Some things I need help with:
How do I tell the switch to use the router for addresses it doesn't know (e.g. internet)? I'm guessing a default route (0.0.0.0) but which interface of the router do I point this to?

Any thoughts on anything mentioned above?
network.jpg

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A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.