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6 <title>Petter Reinholdtsen: entries from October
2013</title>
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15 <a href=
"http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen
</a>
22 <h3>Entries from October
2013.
</h3>
26 <a href=
"http://people.skolelinux.org/pere/blog/Perl_library_to_control_the_Spykee_robot_moved_to_github.html">Perl library to control the Spykee robot moved to github
</a>
32 <p>Back in
2010, I created a Perl library to talk to
33 <a href=
"http://en.wikipedia.org/wiki/Spykee">the Spykee robot
</a>
34 (with two belts, wifi, USB and Linux) and made it available from my
35 web page. Today I concluded that it should move to a site that is
36 easier to use to cooperate with others, and moved it to github. If
37 you got a Spykee robot, you might want to check out
38 <a href=
"https://github.com/petterreinholdtsen/libspykee-perl">the
39 libspykee-perl github repository
</a>.
</p>
45 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>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/robot">robot
</a>.
50 <div class=
"padding"></div>
54 <a href=
"http://people.skolelinux.org/pere/blog/Good_causes__Debian_Outreach_Program_for_Women__EFF_documenting_the_spying_and_Open_access_in_Norway.html">Good causes: Debian Outreach Program for Women, EFF documenting the spying and Open access in Norway
</a>
60 <p>The last few days I came across a few good causes that should get
61 wider attention. I recommend signing and donating to each one of
64 <p>Via
<a href=
"http://www.debian.org/News/weekly/2013/18/">Debian
65 Project News for
2013-
10-
14</a> I came across the Outreach Program for
66 Women program which is a Google Summer of Code like initiative to get
67 more women involved in free software. One debian sponsor has offered
68 to match
<a href=
"http://debian.ch/opw2013">any donation done to Debian
69 earmarked
</a> for this initiative. I donated a few minutes ago, and
70 hope you will to. :)
</p>
72 <p>And the Electronic Frontier Foundation just announced plans to
73 create
<a href=
"https://supporters.eff.org/donate/nsa-videos">video
74 documentaries about the excessive spying
</a> on every Internet user that
75 take place these days, and their need to fund the work. I've already
76 donated. Are you next?
</p>
78 <p>For my Norwegian audience, the organisation Studentenes og
79 Akademikernes Internasjonale Hjelpefond is collecting signatures for a
80 statement under the heading
81 <a href=
"http://saih.no/Bloggers_United/">Bloggers United for Open
82 Access
</a> for those of us asking for more focus on open access in the
83 Norwegian government. So far
499 signatures. I hope you will sign it
90 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/debian">debian
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance
</a>.
95 <div class=
"padding"></div>
99 <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>
105 <p>Wireless mesh networks are self organising and self healing
106 networks that can be used to connect computers across small and large
107 areas, depending on the radio technology used. Normal wifi equipment
108 can be used to create home made radio networks, and there are several
109 successful examples like
110 <a href=
"http://www.freifunk.net/">Freifunk
</a> and
111 <a href=
"http://www.awmn.net/">Athens Wireless Metropolitan Network
</a>
113 <a href=
"http://en.wikipedia.org/wiki/List_of_wireless_community_networks_by_region#Greece">wikipedia
114 for a large list
</a>) around the globe. To give you an idea how it
115 work, check out the nice overview of the Kiel Freifunk community which
116 can be seen from their
117 <a href=
"http://freifunk.in-kiel.de/ffmap/nodes.html">dynamically
118 updated node graph and map
</a>, where one can see how the mesh nodes
119 automatically handle routing and recover from nodes disappearing.
120 There is also a small community mesh network group in Oslo, Norway,
121 and that is the main topic of this blog post.
</p>
123 <p>I've wanted to check out mesh networks for a while now, and hoped
124 to do it as part of my involvement with the
<a
125 href=
"http://www.nuug.no/">NUUG member organisation
</a> community, and
126 my recent involvement in
127 <a href=
"https://wiki.debian.org/FreedomBox">the Freedombox project
</a>
128 finally lead me to give mesh networks some priority, as I suspect a
129 Freedombox should use mesh networks to connect neighbours and family
130 when possible, given that most communication between people are
131 between those nearby (as shown for example by research on Facebook
132 communication patterns). It also allow people to communicate without
133 any central hub to tap into for those that want to listen in on the
134 private communication of citizens, which have become more and more
135 important over the years.
</p>
137 <p>So far I have only been able to find one group of people in Oslo
138 working on community mesh networks, over at the hack space
139 <a href=
"http://hackeriet.no/">Hackeriet
</a> at Husmania. They seem to
140 have started with some Freifunk based effort using OLSR, called
141 <a href=
"http://oslo.freifunk.net/index.php?title=Main_Page">the Oslo
142 Freifunk project
</a>, but that effort is now dead and the people
143 behind it have moved on to a batman-adv based system called
144 <a href=
"http://meshfx.org/trac">meshfx
</a>. Unfortunately the wiki
145 site for the Oslo Freifunk project is no longer possible to update to
146 reflect this fact, so the old project page can't be updated to point to
147 the new project. A while back, the people at Hackeriet invited people
148 from the Freifunk community to Oslo to talk about mesh networks. I
149 came across this video where Hans Jørgen Lysglimt interview the
150 speakers about this talk (from
151 <a href=
"https://www.youtube.com/watch?v=N2Kd7CLkhSY">youtube
</a>):
</p>
153 <p><iframe width=
"420" height=
"315" src=
"https://www.youtube.com/embed/N2Kd7CLkhSY" frameborder=
"0" allowfullscreen
></iframe></p>
155 <p>I mentioned OLSR and batman-adv, which are mesh routing protocols.
156 There are heaps of different protocols, and I am still struggling to
157 figure out which one would be "best" for some definitions of best, but
158 given that the community mesh group in Oslo is so small, I believe it
159 is best to hook up with the existing one instead of trying to create a
160 completely different setup, and thus I have decided to focus on
161 batman-adv for now. It sure help me to know that the very cool
162 <a href=
"http://www.servalproject.org/">Serval project in Australia
</a>
163 is using batman-adv as their meshing technology when it create a self
164 organizing and self healing telephony system for disaster areas and
165 less industrialized communities. Check out this cool video presenting
167 <a href=
"https://www.youtube.com/watch?v=30qNfzJCQOA">youtube
</a>):
</p>
169 <p><iframe width=
"560" height=
"315" src=
"https://www.youtube.com/embed/30qNfzJCQOA" frameborder=
"0" allowfullscreen
></iframe></p>
171 <p>According to the wikipedia page on
172 <a href=
"http://en.wikipedia.org/wiki/Wireless_mesh_network">Wireless
173 mesh network
</a> there are around
70 competing schemes for routing
174 packets across mesh networks, and OLSR, B.A.T.M.A.N. and
175 B.A.T.M.A.N. advanced are protocols used by several free software
176 based community mesh networks.
</p>
178 <p>The batman-adv protocol is a bit special, as it provide layer
2
179 (as in ethernet ) routing, allowing ipv4 and ipv6 to work on the same
180 network. One way to think about it is that it provide a mesh based
181 vlan you can bridge to or handle like any other vlan connected to your
182 computer. The required drivers are already in the Linux kernel at
183 least since Debian Wheezy, and it is fairly easy to set up. A
184 <a href=
"http://www.open-mesh.org/projects/batman-adv/wiki/Quick-start-guide">good
185 introduction
</a> is available from the Open Mesh project. These are
186 the key settings needed to join the Oslo meshfx network:
</p>
189 <tr><th>Setting
</th><th>Value
</th></tr>
190 <tr><td>Protocol / kernel module
</td><td>batman-adv
</td></tr>
191 <tr><td>ESSID
</td><td>meshfx@hackeriet
</td></tr>
192 <td>Channel / Frequency
</td><td>11 /
2462</td></tr>
193 <td>Cell ID
</td><td>02:BA:
00:
00:
00:
01</td>
196 <p>The reason for setting ad-hoc wifi Cell ID is to work around bugs
197 in firmware used in wifi card and wifi drivers. (See a nice post from
199 "
<a href=
"http://tiebing.blogspot.no/2009/12/ad-hoc-cell-splitting-re-post-original.html">Information
200 about cell-id splitting, stuck beacons, and failed IBSS merges!
</a>
201 for details.) When these settings are activated and you have some
202 other mesh node nearby, your computer will be connected to the mesh
203 network and can communicate with any mesh node that is connected to
204 any of the nodes in your network of nodes. :)
</p>
206 <p>My initial plan was to reuse my old Linksys WRT54GL as a mesh node,
207 but that seem to be very hard, as I have not been able to locate a
208 firmware supporting batman-adv. If anyone know how to use that old
209 wifi access point with batman-adv these days, please let me know.
</p>
211 <p>If you find this project interesting and want to join, please join
212 us on IRC, either channel
213 <a href=
"irc://irc.freenode.net/#oslohackerspace">#oslohackerspace
</a>
214 or
<a href=
"irc://irc.freenode.net/#nuug">#nuug
</a> on
215 irc.freenode.net.
</p>
217 <p>While investigating mesh networks in Oslo, I came across an old
218 research paper from the university of Stavanger and Telenor Research
219 and Innovation called
220 <a href=
"http://folk.uio.no/paalee/publications/netrel-egeland-iswcs-2008.pdf">The
221 reliability of wireless backhaul mesh networks
</a> and elsewhere
222 learned that Telenor have been experimenting with mesh networks at
223 Grünerløkka in Oslo. So mesh networks are also interesting for
224 commercial companies, even though Telenor discovered that it was hard
225 to figure out a good business plan for mesh networking and as far as I
226 know have closed down the experiment. Perhaps Telenor or others would
227 be interested in a cooperation?
</p>
229 <p><strong>Update
2013-
10-
12</strong>: I was just
230 <a href=
"http://lists.alioth.debian.org/pipermail/freedombox-discuss/2013-October/005900.html">told
231 by the Serval project developers
</a> that they no longer use
232 batman-adv (but are compatible with it), but their own crypto based
239 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug
</a>.
244 <div class=
"padding"></div>
248 <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>
254 <p>The other day I was pleased and surprised to discover that Marcelo
255 Salvador had published a
256 <a href=
"https://www.youtube.com/watch?v=w-GgpdqgLFc">video on
257 Youtube
</a> showing how to install the standalone Debian Edu /
258 Skolelinux profile. This is the profile intended for use at home or
259 on laptops that should not be integrated into the provided network
260 services (no central home directory, no Kerberos / LDAP directory etc,
261 in other word a single user machine). The result is
11 minutes long,
262 and show some user applications (seem to be rather randomly picked).
263 Missed a few of my favorites like celestia, planets and chromium
264 showing the
<a href=
"http://www.zygotebody.com/">Zygote Body
3D model
265 of the human body
</a>, but I guess he did not know about those or find
266 other programs more interesting. :) And the video do not show the
267 advantages I believe is one of the most valuable featuers in Debian
268 Edu, its central school server making it possible to run hundreds of
269 computers without hard drives by installing one central
270 <a href=
"http://www.ltsp.org/">LTSP server
</a>.
</p>
272 <p>Anyway, check out the video, embedded below and linked to above:
</p>
274 <iframe width=
"420" height=
"315" src=
"http://www.youtube.com/embed/w-GgpdqgLFc" frameborder=
"0" allowfullscreen
></iframe>
276 <p>Are there other nice videos demonstrating Skolelinux? Please let
283 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>.
288 <div class=
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3)
</a></li>
489 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (
11)
</a></li>
491 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/intervju">intervju (
37)
</a></li>
493 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (
7)
</a></li>
495 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/kart">kart (
18)
</a></li>
497 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ldap">ldap (
8)
</a></li>
499 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/lenker">lenker (
6)
</a></li>
501 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (
1)
</a></li>
503 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (
25)
</a></li>
505 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk (
235)
</a></li>
507 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug (
155)
</a></li>
509 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (
8)
</a></li>
511 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/open311">open311 (
2)
</a></li>
513 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (
45)
</a></li>
515 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern (
66)
</a></li>
517 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/raid">raid (
1)
</a></li>
519 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/reprap">reprap (
11)
</a></li>
521 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rfid">rfid (
2)
</a></li>
523 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/robot">robot (
8)
</a></li>
525 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rss">rss (
1)
</a></li>
527 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ruter">ruter (
4)
</a></li>
529 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (
2)
</a></li>
531 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (
31)
</a></li>
533 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (
4)
</a></li>
535 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (
4)
</a></li>
537 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/standard">standard (
43)
</a></li>
539 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (
3)
</a></li>
541 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (
8)
</a></li>
543 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (
19)
</a></li>
545 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (
1)
</a></li>
547 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/valg">valg (
8)
</a></li>
549 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/video">video (
39)
</a></li>
551 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (
4)
</a></li>
553 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/web">web (
28)
</a></li>
559 <p style=
"text-align: right">
560 Created by
<a href=
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