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Difference between revisions of "Mesh/Technical Overview"
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= Technical overview = | |||
== Home and extender nodes == | |||
''Note: You can also read the [[home node|non-technical explanation of home nodes and extender nodes]]. It has a nice illustration.'' | |||
Our mesh has two types of nodes: Home nodes and extender nodes. | |||
The home nodes run the full sudowrt firmware and on its own a bunch of home nodes will make up a fine mesh network. The home node is a normal five-ethernet-port indoor wifi router. An extender node runs a minimal firmware and does nothing on its own. Instead, the extender node basically acts as extra radios when plugged in to a home node. The node operator can put a home node in e.g. their living room and if they later decide they want a high speed directional link to a neighbour then they can put e.g. a Nanobridge M5 running the extender node firmware on their roof and connect it via ethernet to the home node. Or they could put a Nanostation M2 pointed out their window and extend the signal further out into the street or to nearby neighbours. Each extender node extends all three networks (explained in the next section). | |||
For home nodes we are currently only officially supporting the [http://www.tp-link.us/products/details/cat-9_TL-WDR3600.html TP-Link TL-WDR3600]. We are not planning to support anything else for the time being, though if you have a good reason please let us know. For extender nodes we are currently supporting | |||
The mesh is made up mostly of wifi routers using Atheros chipsets and running [https://github.com/sudomesh/sudowrt-firmware our own firmware] based on [http://openwrt.org/ OpenWRT], [http://www.pps.univ-paris-diderot.fr/~jch/software/babel/ Babel] and wlan slovenja's [https://github.com/sudomesh/tunneldigger tunneldigger]. | |||
Node-owners can choose to connect the nodes to their existing internet connection using ethernet. If they have Internet access, they can share a portion of it with the mesh. The amount of bandwidth shared is limited with 'tc'. It is chosen at node-configuration time and can be changed using the simple built-in web admin interface. | |||
== The three wifi networks and IP assignment == | |||
The nodes each run three wifi networks (three SSIDs on the same physical wifi interfaces): | |||
The nodes each | * The Open network with SSID peoplesopen.net is an open access point. Most people will use the network by connecting to this. | ||
* The Mesh network with SSID pplsopen.net-node2node is an ad-hoc network that the nodes use to mesh with each other using Babel | |||
* A private wifi network that is named by the node owner (or a name is generated) and uses WPA2-PSK. | |||
All three of these networks are available on both 2.4 and 5 GHz on the home node. They are also all three available on any extender nodes plugged in to the home node. The three different networks are extended over a single ethernet cable using VLANs. | |||
If a node-owner is sharing internet, then the node will create a layer 2 (L2TP) tunnel to a VPN server on the Internet using tunneldigger. batman-adv will connect over this tunnel to other nodes on the mesh, so the mesh can route traffic over the internet if no wifi path to another node is available (e.g. other nodes are physically too far away). When people connect to the peoplesopen.net access point and try to access the Internet, the traffic will flow through the VPN, and the source IP of requests will appear to be the VPN with the sudo mesh organization listed as the abuse contact. | If a node-owner is sharing internet, then the node will create a layer 2 (L2TP) tunnel to a VPN server on the Internet using tunneldigger. batman-adv will connect over this tunnel to other nodes on the mesh, so the mesh can route traffic over the internet if no wifi path to another node is available (e.g. other nodes are physically too far away). When people connect to the peoplesopen.net access point and try to access the Internet, the traffic will flow through the VPN, and the source IP of requests will appear to be the VPN with the sudo mesh organization listed as the abuse contact. | ||
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One of our medium-term goals is to be able to sell nodes on our website and minimize the amount of work required to re-flash/configure the nodes and provide documentation for the user. To facilitate this, our current process for new nodes is: | One of our medium-term goals is to be able to sell nodes on our website and minimize the amount of work required to re-flash/configure the nodes and provide documentation for the user. To facilitate this, our current process for new nodes is: | ||
* A new node is flashed either automatically (using e.g. [https://github.com/sudomesh/ubiquiti-flasher ubiquiti-flasher] or [https://github.com/sudomesh/merakiflasher merakiflasher]) or manually with the [https://github.com/sudomesh/sudowrt-firmware sudowrt] firmware. | * A new node is flashed either automatically (using e.g. [https://github.com/sudomesh/ubiquiti-flasher ubiquiti-flasher] or [https://github.com/sudomesh/merakiflasher merakiflasher]) or manually with your own tools and the [https://github.com/sudomesh/sudowrt-firmware sudowrt] firmware. | ||
* The node is | * The node is then configured by a sudo mesh volunteer using our [https://github.com/sudomesh/makenode makenode] software. | ||
* | * makenode generates SSH keys, SSH root password, web admin password and private wifi password, then it configures the node, saves the info in the [https://github.com/sudomesh/node-database node database] and shuts down the node. | ||
* makenode then automatically [https://github.com/sudomesh/ql570 prints a sticker] containing some basic info including wifi and web admin passwords. | |||
* | |||
* The sudo mesh volunteer attaches the sticker to the nodes power supply and puts the node back in the box with a set of instructions for how to install and use the node. | * The sudo mesh volunteer attaches the sticker to the nodes power supply and puts the node back in the box with a set of instructions for how to install and use the node. | ||
* The node is shipped to the new node owner! | * The node is shipped to the new node owner! | ||
== Node management == | == Node management == | ||
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We don't yet have a solution for node monitoring but we're expecting to use the new version of wlan slovenja's nodewatcher software. | We don't yet have a solution for node monitoring but we're expecting to use the new version of wlan slovenja's nodewatcher software. | ||
We don't yet have an automatic update solution in place, but | We don't yet have an automatic update solution in place, but we are looking at the software used by Gluon. The Gluon update system is centralized but in the long term we would like to have a decentralized system that works something like this: | ||
* Any number of node-updater servers announce themselves on the mesh and whether or not an update is available. | * Any number of node-updater servers announce themselves on the mesh and whether or not an update is available. | ||
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* Once every N hours +/- a random factor, if any node-updaters have updates available, all nodes connect to a randomly chosen node-updater and request an update. | * Once every N hours +/- a random factor, if any node-updaters have updates available, all nodes connect to a randomly chosen node-updater and request an update. | ||
* The node-updaters send the nodes an ipk file with the update and the nodes check the signature and install it if it's signed by a trusted authority. | * The node-updaters send the nodes an ipk file with the update and the nodes check the signature and install it if it's signed by a trusted authority. | ||
==Detailed Documentation== | |||
*[[Mesh/Tracking]] - Problems and solutions related to tracking, logging and anonymity | |||
*[[Mesh/WalkThrough]] - Easy how-to for setting up OpenWRT & BATMAN-adv on Ubiquiti routers | |||
**[[Mesh/OpenWRT]] - Experiences with the OpenWRT router firmware | |||
*[[Mesh/Firmware]] - Everything related to our firmware | |||
**[[Mesh/Firmware/Flash]] - How to install the sudowrt firmware based on openwrt with supported hardware | |||
**[[Mesh/Firmware/Splash page]] - Splash page / Captive Portal | |||
**[[Mesh/Firmware/Bandwidth shaping]] - QoS / Bandwidth shaping | |||
**[[Mesh/Firmware/Zeroconf]] - Issues related to mDNS and DNS-SD | |||
**[[Mesh/Firmware/MTU_issues]] - MTU issues | |||
**[[Mesh/Firmware/Web Admin Development]] - Web admin development | |||
*[[Mesh/Network topology]] - High-level explanation of the mesh network structure | |||
*[[Mesh/Specs]] - Specs sheet on different access points | |||
*[[Mesh/Frequencies]] - Information on different frequencies. | |||
*[[Mesh/Software tools]] - List of useful mesh troubleshooting tools | |||
*[[Mesh/Terms]] - Hidden Node, Fresnal zone, and other jargons | |||
*[[Mesh/Power]] - Stuff about power usage, batteries and solar power. | |||
*[[Mesh/Monitoring]] - notes about how to monitor systems | |||
*[[Mesh/Spectrum]] - Different forms of spectral analysis | |||
*[[Mesh/Hardware support]] - Officially and unofficially supported hardware / routers | |||
*[[Mesh/Relay setup]] - Setting up a relay node | |||
*[[Mesh/Exit setup]] - Setting up an exit node | |||
*[[Mesh/Spectrum mapping]] - The setup we use for mapping local spectrum and wifi usage | |||
**[[Mesh/Spectrum mapping/XO-1 Laptop]] - How to configure an XO-1 laptop for use with our spectrum mapping setup | |||
* [[Mesh/Install]] - physical installation notes/stories | |||
* [[Mesh/Diagrams]] - technical diagrams to support new outreach materials | |||