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Some time on Tuesday afternoon, about 50,000 Comcast Internet customers in Houston will become part of a massive public Wi-Fi hotspot network, a number that will swell to 150,000 by the end of June. Comcast will begin activating a feature in its Arris Touchstone Telephony Wireless Gateway Modems that sets up a public Wi-Fi hotspot alongside a residential Internet customer’s private home network. Other Comcast customers will be able to log in to the hotspots for free using a computer, smartphone or other mobile device. And once they log into one, they’ll be automatically logged in to others when their devices “see” them. Comcast says the hotspot – which appears as “xfinitywifi” to those searching for a Wi-Fi connection – is completely separate from the home network. Someone accessing the Net through the hotspot can’t get to the computers, printers, mobile devices, streaming boxes and more sitting on the host network. Comcast officials also say that people using the Internet via the hotspot won’t slow down Internet access on the home network. Additional capacity is allotted to handle the bandwidth. You can read more about Comcast’s reason for doing this in my report on HoustonChronicle.com.

What’s interesting about this move is that, by default, the feature is being turned on without its subscribers’ prior consent. It’s an opt-out system – you have to take action to not participate. Comcast spokesman Michael Bybee said on Monday that notices about the hotspot feature were mailed to customers a few weeks ago, and email notifications will go out after it’s turned on. But it’s a good bet that this will take many Comcast customers by surprise. If you have one of these routers and don’t want to host a public Wi-Fi hotspot, here’s how to turn it off.

The additional capacity for public hotspot users is provided through a separate channel on the modem called a “service flow,” according to Comcast. But the speed of the connection reflects the tier of the subscriber hosting the hotspot. For example, if you connect to a hotspot hosted by a home user with a 25-Mbps connection, it will be slower than if you connect to a host system on the 50-Mbps tier.

Comcast is being forced to pay the largest fine the FCC has ever levied against a cable operator. Its offense: Charging customers for services and equipment they didn't ask for. The company agreed to pay a $2.3 million civil penalty and to submit to a "compliance plan," in which regulators will monitor Comcast for the next five years to ensure it cleans up its act.

The FCC said it received over 1,000 complaints from customers, who said Comcast charged them for premium channels, cable boxes, DVRs or other products that they never ordered. In many cases, the FCC said, customers expressly told Comcast that they didn't want the add-on options, but they were charged anyway. Complaints also describe how customers spent "significant time and energy to attempt to remove the unauthorized charges" and get refunds, the commission said. The complaints spurred the FCC to launch an investigation nearly two years ago. Today's settlement marks the conclusion of the probe. Under the five-year compliance plan, Comcast must begin sending customers special notifications every time a new charge or service is added to their bill. The company also has to add a way for customers to easily "block the addition of new services or equipment to their accounts," according to an FCC press release.

Comcast (CMCSA) will also be required to compensate or address complaints from customers who have disputed charges, and it will be barred from referring an account to collections or suspending an account that has a disputed charge. Comcast agreed to the fine without admitting any guilt.

Comcast has been conducting IPv6 technical trials in our production network for more than a year, and we've been working diligently on IPv6 deployment for over 6 years. After so many years of challenging preparatory work, significant technology investment, internal skills development, and close collaboration with our technology partners, I am incredibly pleased to announce that we've achieved another critical milestone in our transition to IPv6 — we have started the pilot market deployment of IPv6 to customers in selected markets! We're now the first large ISP in North America to start deploying IPv6. This is a significant milestone not just inside our own company but also in the industry, particularly given the chicken and egg relationship between the availability of content and software that supports IPv6 and the deployment of IPv6 to end users.

This first phase will support certain types of directly connected CPE, where a single computer is connected directly to a cable modem. Subsequent phases in 2011 and 2012 will support home gateway devices and variable length prefixes. Critically, our approach is "native dual stack" which means customers will get both IPv4 and IPv6 addresses. Some other ISPs that are less prepared may be using tunneling or large scale NAT in the network. Those approaches are likely to result in some applications (such as some real-time applications) breaking or seeming slow. Native dual stack, the approach we are using, avoids breaking or slowing applications and maintains a better and faster broadband Internet experience. Our customers buy Xfinity Internet service in large part for our great speeds, and they can rest assured that they won't have to slow down as the world transitions to IPv6, as we've "just said no to NAT" in this phase of our IPv6 transition.

For all the key technical details, check out this complementary blog post from John Brzozowski.