How to setup an old router with openwrt that blocks all internet traffic but lets lan traffic through? Thx

Any example on How to setup an old router with openwrt that blocks all internet traffic but lets lan traffic through? Thx
(It’s for blocking slingbox from contacting internet and brick themself..) thx

The most reliable way is isolating the problematic client in a separate VLAN or SSID and disabling its forwarding to WAN:

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Don't connect the WAN port ?

Use another firmware on the slingbox, as mentioned here.

Slinger is not a firmware .. it does not block the firmware update traffic

I use Ethernet ports only it will still bridge and connect out to the internet .. I want to make the slingbox intranet only

Well, you're right.
I didn't read it carefully and jumped to a wrong conclusion.