Welcome to the CSIR Meraka Institute's "COIN" Blog

Thursday, October 13, 2005

Best collection of links I've seen for ad hoc networking


Wednesday, October 12, 2005

wistron CM9 Altheros MiniPCI card info

Wiki on the Wistron CM9

Latest windows drivers

Product information

Tuesday, October 11, 2005

Engineering News Article

Its amazing how a simple idea like the cantenna has grabbed the attention of the media. So far I've been interviewed on SABC Africa and by Engineering News (Tin-can bridge to digital society). One would have thought that the technical, innovative stuff we're doing with ad-hoc networking in the larger project would have more interest. I suppose that its easier to grasp the imagination with simplicity.

Sunday, October 02, 2005

Making sense of LQ ILQ and ETX in OLSR

You will see a table like this in the OLSR status screen on Freifunk

Topology entries

Destination IPLast hop IPLQILQETX

LQ = The percentage of packets that are succesfully sent from youself to the neighbour

ILQ = The percentage of packets that succesfully are sent from your neighbour to yourself also often called NLQ

ETX = Expected Trasnmission count = How many trasnmission attempts are required to get packets through = 1 / (LQ*ILQ)

Saturday, October 01, 2005

Getting an OpenWRT Freifunk mesh stable

After a lot of tweaking OLSR running on Linksys has had no "ping down" messages for about 5 days now. Some of the tips to getting OLSR on OpenWRT stable.

1. Lock all the nodes to 802.11B don't let it auto sense
2. If there are any v2.2 hardware devices, change the clock speed to 216MHz with the following commands1

# nvram set clkfreq=216
# nvram commit
# reboot

3. Lock the RX and TX antenna to the one you connected your external antenna too, don't use AUTO. TAKE NOTE!!! On Version 2.0 hardware Antenna A is on the left looking from the front of the linksys and and on Version 2.,2 hardware Antenna A is on the right looking from the fron of the linksys. This caught me out a few times.