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Where can I find an overview of how Roofnet works?
You can find a paper describing the implementation here. |
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Do you have any datasets describing the network?
We have collected many gigabytes of trace data detailing broadcast packet delivery rates/patterns, simultaneous senders and performance at various power levels. Unfortunately, it's not feasible for us to post it all online, so if you're interested in the raw data, please contact us. The SIGCOMM 2004 paper on link-level measurements summarizes most of the trace results. Real-time XML feeds of probe data will also be available in the near future. |
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Do I have to buy anything?
No, we provide all the hardware, however, the equipment is MIT property so we expect users to treat it well and give it back should the need arise. |
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How do I connect my PC/Mac/Linux box to the Internet through my Roofnet node?
Configuration is relatively simple: if you're planning to run multiple computers off the same node, connect your hub or switch directly into the ethernet jack on the back of the roofnet node and connect the others computers accordingly. Otherwise, if you're only connecting a single computer, use a crossover adapter (we probably left you one if you needed it) to connect your computer directly to the node. Under your operating system of choice, select the option to obtain settings automatically (sometimes labeled "use DHCP" for configuration) and you should be set. |
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What does the installation look like?
We mount a 1.5 foot pole-like omnidirectional antenna on your chimney using a mast, then run a cable down to your aparment where it connects to a textbook sized computer running the Roofnet software. We plan to have photographs from an existing installation soon, but if you'd like to take a look in person, drop by our offices near 32-G980. Here are the contents of the self-installation kit:  |
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Does the node make a lot of noise?
The only moving part in the nodes is the hard drive, so it's relatively quiet. We're working on nodes based on Compact Flash devices which will be deafeningly silent. |
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How much power does the node use
The whole setup uses around 23 watts of power and the antenna only transmits at a maximum of 200mW. If you pay around $0.10/kWh (probably more than you actually pay), it comes out to around $2/month. |
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How fast/reliable is the service?
In general users get service similar to that provided by a DSL or cable modem, however if there are few other Roofnet users in your area, your connection may not work as advertised. Regarding reliability: this is an experimental network, so our first priority is research, but we make an effort to keep things running smoothly. We usually perform maintenence and run experiments between 11am and 4pm on weekdays and keep our users informed about upcoming outages. If you're worried about reliablity, you should not cancel your existing service. |
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Any plans to expand into ___?
We're currently focused on the area of Cambridge bordering MIT, since it has the highest concentration of students. In the future, we may branch into other areas. |
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Are you guys watching everything I do?
No, we're not interested in tracking user traffic, but we do occasionally collect trace data to analyze network dynamics as well as summary data (total bytes transmitted over time, etc.). However, users should note that if we get reports of abuse, we will disable your connection to the network. |
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Can I run Roofnet software outside of MIT?
Sure! Check out the software section. |
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Does my Roofnet node act as an 802.11 access point?
At this time, no. The network only handles communications from other nodes running the Grid/Roofnet software, but we're planning to allow direct connections with local clients (via 802.11) in the near future. You can of course connect a wireless router to the node and set up your own access point. |
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Does Roofnet cause cancer in lab rats?
The radios used by Roofnet are FCC certified 802.11 devices and transmit at 200mW or less, so there's no associated health risk. For the sake of comparison, cell phones emit between 600mW and 3 watts of power (source), so Roofnet is relatively safe. Also, we only use passive antennas (which do not contain amplifiers) so it's safe to have an antenna in the house. |
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What if I have an infrequently asked question?
If we didn't answer your question here or on the For Users page, feel free to email us at roofnet@pdos.lcs.mit.edu or drop by our offices in 32-G980. |