[rpnx]

Don't do this. Network firewalls are harmful. Let people configure their own firewalls on device. Having to VPN around network blocks is annoying to say the least. Network firewalls are harmful and just a lazy excuse for bad client security.

[sn0wf1re]

It isn't a firewall, it's a DNS server that returns fake results for entries in its blocklist.

[derwiki]

Is it easier to configure a firewall on my iPhone than I think?