Blocking an IP Range on macOS 10.15.7
To block an entire IP range, such as 17.0.0.0/8, on a macOS 10.15.7 system, you can use the ipfw command-line utility.
Step-by-step guide:
- Open Terminal: Find Terminal in your Applications > Utilities folder or use Spotlight search.
- Disable IPFW if it's not already:
- Configure IPFW to block the specified IP range. In this example, we'll block all incoming traffic from the 17.0.0.0/8 range:
- Allow all other traffic:
- Enable IPFW:
- To check the rules you've added, use:
sudo ipfw -f flush
sudo service ipfw stopsudo ipfw add 1000 fwd 127.0.0.1,1 deny ip from 17.0.0.0 to 17.255.255.255sudo ipfw add 1001 allow ip from any to anysudo service ipfw startsudo ipfw pipe showNotes:
Remember, this example blocks all incoming traffic from the specified IP range. If you want to block outgoing traffic instead, change deny to reject.
` tags, and the content inside the code blocks is properly formatted according to the programming language (Bash).