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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <h3>Entries from October 2013.</h3>
  23
  24     <div class="entry">
  25       <div class="title">
  26         <a href="http://people.skolelinux.org/pere/blog/Oslo_community_mesh_network___with_NUUG_and_Hackeriet_at_Hausmania.html">Oslo community mesh network - with NUUG and Hackeriet at Hausmania</a>
  27       </div>
  28       <div class="date">
  29         11th October 2013
  30       </div>
  31       <div class="body">
  32         <p>Wireless mesh networks are self organising and self healing
  33 networks that can be used to connect computers across small and large
  34 areas, depending on the radio technology used.  Normal wifi equipment
  35 can be used to create home made radio networks, and there are several
  36 successful examples like
  37 <a href="http://www.freifunk.net/">Freifunk</a> and
  38 <a href="http://www.awmn.net/">Athens Wireless Metropolitan Network</a>
  39 (see
  40 <a href="http://en.wikipedia.org/wiki/List_of_wireless_community_networks_by_region#Greece">wikipedia
  41 for a large list</a>) around the globe.  To give you an idea how it
  42 work, check out the nice overview of the Kiel Freifunk community which
  43 can be seen from their
  44 <a href="http://freifunk.in-kiel.de/ffmap/nodes.html">dynamically
  45 updated node graph and map</a>, where one can see how the mesh nodes
  46 automatically handle routing and recover from nodes disappearing.
  47 There is also a small community mesh network group in Oslo, Norway,
  48 and that is the main topic of this blog post.</p>
  49
  50 <p>I've wanted to check out mesh networks for a while now, and hoped
  51 to do it as part of my involvement with the <a
  52 href="http://www.nuug.no/">NUUG member organisation</a> community, and
  53 my recent involvement in
  54 <a href="https://wiki.debian.org/FreedomBox">the Freedombox project</a>
  55 finally lead me to give mesh networks some priority, as I suspect a
  56 Freedombox should use mesh networks to connect neighbours and family
  57 when possible, given that most communication between people are
  58 between those nearby (as shown for example by research on Facebook
  59 communication patterns).  It also allow people to communicate without
  60 any central hub to tap into for those that want to listen in on the
  61 private communication of citizens, which have become more and more
  62 important over the years.</p>
  63
  64 <p>So far I have only been able to find one group of people in Oslo
  65 working on community mesh networks, over at the hack space
  66 <a href="http://hackeriet.no/">Hackeriet</a> at Husmania.  They seem to
  67 have started with some Freifunk based effort using OLSR, called
  68 <a href="http://oslo.freifunk.net/index.php?title=Main_Page">the Oslo
  69 Freifunk project</a>, but that effort is now dead and the people
  70 behind it have moved on to a batman-adv based system called
  71 <a href="http://meshfx.org/trac">meshfx</a>.  Unfortunately the wiki
  72 site for the Oslo Freifunk project is no longer possible to update to
  73 reflect this fact, so the old project page can't be updated to point to
  74 the new project.  A while back, the people at Hackeriet invited people
  75 from the Freifunk community to Oslo to talk about mesh networks.  I
  76 came across this video where Hans Jørgen Lysglimt interview the
  77 speakers about this talk:</p>
  78
  79 <p><iframe width="420" height="315" src="https://www.youtube.com/embed/N2Kd7CLkhSY" frameborder="0" allowfullscreen></iframe></p>
  80
  81 <p>I mentioned OLSR and batman-adv, which are mesh routing protocols.
  82 There are heaps of different protocols, and I am still struggling to
  83 figure out which one would be "best" for some definitions of best, but
  84 given that the community mesh group in Oslo is so small, I believe it
  85 is best to hook up with the existing one instead of trying to create a
  86 completely different setup, and thus this have decided to focus on
  87 batman-adv for now.  It sure help me to  know that the very cool
  88 <a href="http://www.servalproject.org/">Serval project in Australia</a>
  89 is using batman-adv as their meshing technology when it create a self
  90 organizing and self healing telephony system for disaster areas and
  91 less industrialized communities.  Check out this cool video presenting
  92 that project:
  93
  94 <p><iframe width="560" height="315" src="https://www.youtube.com/embed/30qNfzJCQOA" frameborder="0" allowfullscreen></iframe></p>
  95
  96 <p>According to the wikipedia page on
  97 <a href="http://en.wikipedia.org/wiki/Wireless_mesh_network">Wireless
  98 mesh network</a> there are around 70 competing schemes for routing
  99 packets across mesh networks, and OLSR, B.A.T.M.A.N. and
 100 B.A.T.M.A.N. advanced are protocols used by several free software
 101 based community mesh networks.</p>
 102
 103 </p>The batman-adv protocol is a bit special, as it provide layer 2
 104 (as in ethernet ) routing, allowing ipv4 and ipv6 to work on the same
 105 network.  One way to think about it is that it provide a mesh based
 106 vlan you can bridge to or handle like any other vlan connected to your
 107 computer.  The required drivers are already in the Linux kernel at
 108 least since Debian Wheezy, and it is fairly easy to set up.  A
 109 <a href="http://www.open-mesh.org/projects/batman-adv/wiki/Quick-start-guide">good
 110 introduction</a> is available from the Open Mesh project.  These are
 111 the key settings needed to join the Oslo meshfx network:</p>
 112
 113 <table>
 114 <tr><th>Setting</th><th>Value</th></tr>
 115 <tr><td>Protocol / kernel module</td><td>batman-adv</td></tr>
 116 <tr><td>ESSID</td><td>meshfx@hackeriet</td></tr>
 117 <td>Channel / Frequency</td><td>11 / 2462</td></tr>
 118 <td>Cell ID</td><td>02:BA:00:00:00:01</td>
 119 </table>
 120
 121 <p>The reason for setting ad-hoc wifi Cell ID is to work around bugs
 122 in firmware used in wifi card and wifi drivers.  (See a nice post from
 123 VillageTelco about
 124 "<a href="http://tiebing.blogspot.no/2009/12/ad-hoc-cell-splitting-re-post-original.html">Information
 125 about cell-id splitting, stuck beacons, and failed IBSS merges!</a>
 126 for details.)  When these settings are activated and you have some
 127 other mesh node nearby, your computer will be connected to the mesh
 128 network and can communicate with any mesh node that is connected to
 129 any of the nodes in your network of nodes. :)</p>
 130
 131 <p>My initial plan was to reuse my old Linksys WRT54GL as a mesh node,
 132 but that seem to be very hard, as I have not been able to locate a
 133 firmware supporting batman-adv.  If anyone know how to use that old
 134 wifi access point with batman-adv these days, please let me know.</p>
 135
 136 <p>If you find this project interesting and want to join, please join
 137 us on IRC, either channel
 138 <a href="irc://irc.freenode.net/#oslohackerspace">#oslohackerspace</a>
 139 or <a href="irc://irc.freenode.net/#nuug">#nuug</a> on
 140 irc.freenode.net.</p>
 141
 142 <p>While investigating mesh networks in Oslo, I came across an old
 143 research paper from the university of Stavanger and Telenor Research
 144 and Innovation called
 145 <a href="http://folk.uio.no/paalee/publications/netrel-egeland-iswcs-2008.pdf">The
 146 reliability of wireless backhaul mesh networks</a> and elsewhere
 147 learned that Telenor have been experimenting with mesh networks at
 148 Grünerløkka in Oslo.  So mesh networks are also interesting for
 149 commercial companies, even though Telenor discovered that it was hard
 150 to figure out a good business plan for mesh networking and as far as I
 151 know have closed down the experiment.  Perhaps Telenor or others would
 152 be interested in a cooperation?</p>
 153
 154       </div>
 155       <div class="tags">
 156
 157
 158         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.
 159
 160
 161       </div>
 162     </div>
 163     <div class="padding"></div>
 164
 165     <div class="entry">
 166       <div class="title">
 167         <a href="http://people.skolelinux.org/pere/blog/Skolelinux___Debian_Edu_7_1_install_and_overview_video_from_Marcelo_Salvador.html">Skolelinux / Debian Edu 7.1 install and overview video from Marcelo Salvador</a>
 168       </div>
 169       <div class="date">
 170          8th October 2013
 171       </div>
 172       <div class="body">
 173         <p>The other day I was pleased and surprised to discover that Marcelo
 174 Salvador had published a
 175 <a href="https://www.youtube.com/watch?v=w-GgpdqgLFc">video on
 176 Youtube</a> showing how to install the standalone Debian Edu /
 177 Skolelinux profile.  This is the profile intended for use at home or
 178 on laptops that should not be integrated into the provided network
 179 services (no central home directory, no Kerberos / LDAP directory etc,
 180 in other word a single user machine).  The result is 11 minutes long,
 181 and show some user applications (seem to be rather randomly picked).
 182 Missed a few of my favorites like celestia, planets and chromium
 183 showing the <a href="http://www.zygotebody.com/">Zygote Body 3D model
 184 of the human body</a>, but I guess he did not know about those or find
 185 other programs more interesting. :) And the video do not show the
 186 advantages I believe is one of the most valuable featuers in Debian
 187 Edu, its central school server making it possible to run hundreds of
 188 computers without hard drives by installing one central
 189 <a href="http://www.ltsp.org/">LTSP server</a>.</p>
 190
 191 <p>Anyway, check out the video, embedded below and linked to above:</p>
 192
 193 <iframe width="420" height="315" src="http://www.youtube.com/embed/w-GgpdqgLFc" frameborder="0" allowfullscreen></iframe>
 194
 195 <p>Are there other nice videos demonstrating Skolelinux?  Please let
 196 me know. :)</p>
 197
 198       </div>
 199       <div class="tags">
 200
 201
 202         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
 203
 204
 205       </div>
 206     </div>
 207     <div class="padding"></div>
 208
 209     <p style="text-align: right;"><a href="10.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS Feed" width="36" height="14" /></a></p>
 210     <div id="sidebar">
 211
 212
 213
 214 <h2>Archive</h2>
 215 <ul>
 216
 217 <li>2013
 218 <ul>
 219
 220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 221
 222 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 223
 224 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 227
 228 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 229
 230 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 231
 232 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 233
 234 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 235
 236 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 237
 238 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (2)</a></li>
 239
 240 </ul></li>
 241
 242 <li>2012
 243 <ul>
 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 250
 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 252
 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 256
 257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 258
 259 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 260
 261 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 262
 263 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 264
 265 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 266
 267 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 268
 269 </ul></li>
 270
 271 <li>2011
 272 <ul>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 279
 280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 281
 282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 283
 284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 285
 286 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 287
 288 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 289
 290 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 291
 292 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 293
 294 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 295
 296 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 297
 298 </ul></li>
 299
 300 <li>2010
 301 <ul>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 306
 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 308
 309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 310
 311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 312
 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 314
 315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 316
 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 318
 319 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 320
 321 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 322
 323 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 324
 325 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 326
 327 </ul></li>
 328
 329 <li>2009
 330 <ul>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 337
 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 343
 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 345
 346 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 347
 348 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 349
 350 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 351
 352 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 353
 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 355
 356 </ul></li>
 357
 358 <li>2008
 359 <ul>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 364
 365 </ul></li>
 366
 367 </ul>
 368
 369
 370
 371 <h2>Tags</h2>
 372 <ul>
 373
 374  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
 375
 376  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 377
 378  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 379
 380  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 381
 382  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (7)</a></li>
 383
 384  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (12)</a></li>
 385
 386  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 387
 388  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (86)</a></li>
 389
 390  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (142)</a></li>
 391
 392  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 393
 394  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (10)</a></li>
 395
 396  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 397
 398  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (219)</a></li>
 399
 400  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (21)</a></li>
 401
 402  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 403
 404  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (12)</a></li>
 405
 406  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (2)</a></li>
 407
 408  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (11)</a></li>
 409
 410  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (37)</a></li>
 411
 412  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (7)</a></li>
 413
 414  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (18)</a></li>
 415
 416  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (8)</a></li>
 417
 418  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (6)</a></li>
 419
 420  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 421
 422  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (25)</a></li>
 423
 424  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (235)</a></li>
 425
 426  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (154)</a></li>
 427
 428  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (8)</a></li>
 429
 430  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 431
 432  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (44)</a></li>
 433
 434  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (66)</a></li>
 435
 436  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
 437
 438  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 439
 440  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (2)</a></li>
 441
 442  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (7)</a></li>
 443
 444  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 445
 446  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (4)</a></li>
 447
 448  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 449
 450  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (31)</a></li>
 451
 452  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 453
 454  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (4)</a></li>
 455
 456  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (43)</a></li>
 457
 458  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (3)</a></li>
 459
 460  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (8)</a></li>
 461
 462  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (18)</a></li>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (1)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (8)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (39)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (28)</a></li>
 473
 474 </ul>
 475
 476
 477     </div>
 478     <p style="text-align: right">
 479  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 480 </p>
 481
 482   </body>
 483 </html>