Comment IPCop or Smoothwall With Squidguard (Score 1) 338
http://www.ipcop.org/
Bootable Linux ISO installed on some dinosaur PC hardware. 2 NICs, Inside & Outside. Put behind the Linksys/Netgear/router. Install the Squidguard add on. Transparent Proxy that watches ALL HTTP (TCP port 80) traffic and HTTPS (TCP 443) URL's. transparent for all outbound recording. Designed network bottleneck for all outbound Internet traffic.
Configure DHCP client on the outside, and DHCP server to the inside. So all clients receive DHCP services from IPCop.
All free.