Brass Horn Comms - OnionDSL
Offering Tor or VPN services over-the-top of a normal Internet connection is the most common way for people to connect, however misconfigurations and exploits can result in leaked meta data or clear net browsing that can compromise your privacy.
The OnionDSL design however is a closed network between your DSL modem and the Brass Horn Comms Tor bridges which may make the collection of Internet Connection Records (and by extension other forms of bulk surveillance) less effective.
This is achieved by only issuing private IP addresses to remote endpoints which if 'leaked' won't identify you or Brass Horn Communications as your ISP. (Furthermore your computers aren't technically connected to the Internet so can't communicate to the servers that the exploits need to connect to in order to leak your address.) and your router / PCs connecting directly to the Tor bridge in order to reach the Internet.
How it works: Bridges
As your modem / computers only have RFC1918 addresses and can only reach the Tor Bridges it is impossible to accidentally 'leak' information to the clearnet. After configuring your devices to connect to the Brass Horn Comms Tor bridges you will then have full access to the Internet whilst being protected by Tor.
You Don't Need OnionDSL
You can prevent generating meaningful Internet Connection Records by using the normal Tor Browser Bundle. If/when OnionDSL becomes a product we would strongly recommend it only being deployed in communal locations such as libraries or refuge shelters.
Signing up for 'surveillance frustrating' broadband would likely be a big red flag!