Deny Lan to Wan Default with Whitelist

Computer connects to LAN, DietPi on SBC connects to WAN.

I want SBC to whitelist only certain IPs from the computer, which are IPs I use to connect to work using my VPN, I want everything else denied. I don’t care what IPs the DietPi connects to from inside the SBC, such as when updating.

The only exception is I want to be able to access the SBC using Remmina or ssh.

How can I do this?

iptables should be able to do this job

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What would be the ip tables commands?

if work vpn is, then

iptables -A OUTPUT -p tcp -d --dport 443 -j ACCEPT
iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -P INPUT DROP
iptables -P OUTPUT DROP