There aren’t (m)any lightweight captive portal solutions out there for us, except a few clumsy heavy or badly maintained projects together with heir professional counterparts in routers better than home-grade. Captive portals are cool and useful, read on how to build one, including video demo.
Build a OpenBSD wireless access point that redirects any client request for any website to a website of your own design. With a little imagination you could adapt this technique for more nefarious purposes – but that is not something we endorse here. Something more applicable to our kind may be to use this technique to do basic DNS based filtering, ad-blocking or something along those lines.
This Guide explains how you would setup a wireless hotspot using OpenBSD and PF so you can provide internet access to wireless clients such as laptops or phones.
This explains how to quickly setup the amazing fail2ban, which monitors your log files for activity you specify and performs certain actions once a threshold is reached. Simplest case: Monitor authlog for failed ssh login attempts, and ban the originating IP after a few tries.
This guide helps you setup a simple firewall for any FreeBSD version (recent) that can load the firewall module.
The original guide is found at http://thoughtstorm.net/howto/bsdtopix.
Okay, I wrestled this for a few days; there is no real documentation on making a xBSD-based firewall talk the
VPN talk to a Cisco PIX that I could find. It’s based on racoon, with ipfilter doing the firewalling. gif interface support should already be compiled into the kernel unless you specifically removed it.
The original guide is found at www.derrickl.net/guides.
The purpose of this guide is to provide the reader with enough knowledge to configure FreeBSD with a basic NAT/Firewall setup, allowing you to share your internet connection between all your computers with only one IP address, and to protect your network from hackers.