Block local network

[JB-ICT]

Hi I used your script to install WireGuard and everything works fine, very handy script.
my next challange is to limit local traffic.

The vpn is also used by a friend and I he may not access my local network, so only internet and dns.

My setup:

• WireGuard is running on a Raspberry
• On the same Raspberry I use piHole, in his configuration he uses it also
• The other processes on this Raspberry may only not be accessible for him, I use them when connected to vpn
• In my router I forwarded the port used by WireGuard to my Raspberry

I tried of find it out myself but my knowledge op iptables is very limited.