On home network, block all but internet traffic from router devices

RouterOS General
1

I bought a hEX router in order to isolate a work computer from the home network. We currently have a combo modem/router that is not very configurable, so I got the hEX.

I have the hEX wan/port 1 plugged into one of the ethernet ports on the modem/router.

Home network is 192.168.0.0/24 and gateway is 192.168.0,1.

Isolated router is 192.168.88.0/24 (the default), which probably doesn’t matter.

I know I can just block the home network via:

add chain=forward dst-address=192.168.0.0/24 action=drop

Except that I want to allow traffic to the gateway, 192.168.0.1.

How do I exclude that one address from being dropped? The rest of the router configuration (apart from password) is the default currently.

2

To directly answer your Question,
you only need an additional Firewall-Rule placed before your “block-Rule”
Something like:
add chain=forward dst-address=192.168.0.1 action=accept

3

Post your hex config
/export hide-sensitive file=anynameyouwish for review.

this can be simply resolved quickly once provided.