Pretoria Mesh

2006-06-20T14:24:30Z

Hvrensburg: /* Network Log 19 June 2006 */

The CSIR Pretoria mesh network was setup as a test-bed mesh network in order to get an understanding of the issues that face real-world, outdoor mesh networks. Some of these issues include [[LOS]] (Line of Sight), [[Weather Proofing]] and the [[Hidden Node]] problem.

Below is a diagram showing the current status of the mesh network, green nodes show people who are currently connected, red nodes show people who would like to be connected in the future

[[Image:Pta-mesh3.jpg]]

=Visualisation=

=Nodes=

***Please fill in information about your node e.g. Equipment, Placement (Rooftop), Hardware etc.

[[Koppie Node]]

[[Rodricks Node]]

[[Davids Node]]

[[Karels Node]]

[[Louis Node]]

[[Andrews Node]]

[[Johns Node]]

[[Johanns Node]]

Want to join the Pretoria Mesh?

1. Visit [http://www.nodedb.com/africa/za/pretoria/? NodeDB] and create a node for yourself.
2. Build a node. Read the [[HowTos]] for more information on building your own node.
3. Get [[Pretoria Mesh Settings]] and configure your node.

= Network Log 30 January 2006 =

Elardus Park went down at 5:50PM (omni and directional) after a heavy raintorm - I'll climb up tomorrow morning and have a look.

= Network Log 1 May 2006 =

I noticed that the elardus park tower would often lose its routing information for the elardus park mesh so I did a bit of research on the olsrd.conf file. Here is what I discovered

The /usr/local/etc/olsrd.conf file had the following settings
HelloInterval 3.0
HelloValidityTime 9.0 (default 3xHelloInterval)
TCInterval 5.0
TCValidityTime 15.0 (default)
MidInterval 5.0 (default)
MidValidityTime 15.0 (default)
HnaInterval 5.0
HnaValidityTime 15.0

With the validity times being so short, a large file downnload would saturate the traffic and occasionally not allow a hello packet through allowing the routing info to expire after the validity time which was 15 seconds for TC

I changed the interval settings to those found in Freifunk firmware which are better suited for static meshes like ours, the intervals were set to:

HelloInterval 5.0
HelloValidityTime 90.0
TcInterval 15.0
TcValidityTime 90.0
MidInterval 15.0
MidValidityTime 90.0
HnaInterval 15.0
HnaValidityTime 90.0

Lets hope the network is more stable now!

P.S. To change the /usr/local/etc/olsrd.conf on the soekris running freeBSD you must do the following

mount -u -w /
vi /usr/local/etc/olsrd.conf
sync
mount -u -r /

= Network Log 5 May 2006 =

Added Chris Krause onto network

WiFi: 10.1.1.52
LAN: 10.3.52.1

What a mission - for some reason his Linksys with OpenWRT refused to work in client mode - I had to use our old SVEASOFT ZULU release that we built with RIP at the end of 2004 and flash it to an old Linksys 2.2 that I had lying around.

= Network Log 10 May 2006 =

Added Marelie Davel onto network

WiFi: 10.51.1.23
LAN: 10.3.23.1

Discovered major problem with new Freifunk firmware

If you have a '-' in the ssid it interprets this as a command line option
So "pta-mesh" caused the wireless interface to fail

Had to change all mesh node in the Pretoria wireless network to "ptamesh"

When I changed Rodericks to "ptamesh" and reboot a very weird thing happened
After logging in and checking the state of the wireless interface here is what I found:

rodrick2istc# ifconfig wi0
wi0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::202:2dff:fe25:5fae%wi0 prefixlen 64 scopeid 0x4
inet 10.50.1.1 netmask 0xffffff00 broadcast 10.50.1.255
ether 00:02:2d:25:5f:ae
media: IEEE 802.11 Wireless Ethernet autoselect mode 11b <adhoc> (DS/11Mbps <adhoc>)
status: associated
ssid "Sector 2" channel 4 bssid 00:0b:6b:37:45:2b
stationname "FreeBSD WaveLAN/IEEE node"
authmode OPEN privacy OFF txpowmax 100 bintval 100

Huh!! How did it change it's ssid to 'Sector 2 and channel to 4 when it should be ssid: ptamesh, channel 11!!!!!!
Is someone taking over the node?

= Network Log 15 May 2006 =

The Elardus park mesh is still having problems with routing tables disappearing between my node and the water tower.

The Soekris on the water tower is running OLSR build 0.4.9 whereas the Linksys is running OLSR build 0.4.10-pre
There could be some minor protocol differences between them which I suspect is causing the problem

Running olsrd in debug mode on the soekris gives me the following errors

10.51.1.12:INF <- 10.51.1.12 FAILED
10.51.1.13:INF <- 10.51.1.13 FAILED
10.51.1.14:INF <- 10.51.1.14 FAILED
10.51.1.20:INF <- 10.51.1.20 FAILED
Updating kernel routes...
mid set: 23:06:07.405772

Processing TC from 10.51.1.14
Received TC from NON SYM neighbor 10.51.1.13
Unknown type: 130, size 64, from 10.51.1.13
Processing TC from 10.51.1.12
Received TC from NON SYM neighbor 10.51.1.13
Received HNA from NON SYM neighbor 10.51.1.13
Received HNA from NON SYM neighbor 10.51.1.13

= Network Log 18 June 2006 =

Strange things happening at Elardus park
ETX to tower from my house now at 2.2 with about 50% of packets being lost

Checked settings at Elardus Park
ssid is empty??
similar problem to Rodericks that had its ssid changed

ndis0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::202:6fff:fe34:21cb%ndis0 prefixlen 64 scopeid 0x1
inet 10.51.1.1 netmask 0xffffff00 broadcast 10.51.1.255
ether 00:02:6f:34:21:cb
media: IEEE 802.11 Wireless Ethernet autoselect (DS/1Mbps <adhoc>)
status: associated
ssid "" channel 1
authmode OPEN privacy OFF txpowmax 100 protmode CTS

Could it be interference on channel 1 (Louis has an AP near him on channel 3 which can cause interference on channel 1 - maybe when the network is quite I'll do a channel change and check

= Network Log 19 June 2006 =

Captains log Stardate 2006

'''Changed elarduspark network to channel 11'''

Looks like it was an interference problem, after changing the channel on all the nodes to channel 11, the ETX values recovered to good levels again

IP Hysteresis LinkQuality lost total NLQ ETX
10.51.1.1 0.00 0.94 6 100 1.00 1.06
10.51.1.20 0.00 0.86 14 100 1.00 1.16
10.51.1.12 0.00 0.81 19 100 1.00 1.23
10.51.1.14 0.00 0.89 11 100 1.00 1.12

The strange ssid problem on Elardus Park is apparently just a bug in the reporting tool of FreeBSD

*** HELP ***

PERHAPS NOT THE CORRECT PLACE TO POST THIS MESSAGE BUT COULD ANYONE ASSIST IN CONNECTING TO THE ELARDUSPARK TOWER.

I'M ABOUT 1 KM FROM THE TOWER HOWEVER DON'T HAVE LINE OF SIGHT. IT WOULD APPEAR THAT I NEED TO HAVE LINE OF SIGHT, OTHERWISE MY 802.11 CARD WONT PICK UP PTAMESH.

ANY HELP MUCH APREACIATED.

hvrensburgATigrade.co.za

Talk:Pretoria Mesh

2006-06-05T14:08:22Z

Hvrensburg:

Are the network settings for ptamesh available, or how could I go about connecting?

Thanks

WirelessAfrica - User contributions [en]

Pretoria Mesh

Talk:Pretoria Mesh