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all the different articles on running madwifi adhoc on the web say the
iwpriv ath0 bgscan 0
- in other words, turn off background scanning.
This does improve the reliability of the connections.
For background scanning to work as a station (connected to an AP)
the station goes into powersave mode, does a background scan, and returns
from power save mode.
power save mode does not work in adhoc.
ping ramping, ticket 1154, is something that happens after some uptime. I
have seen ping ramping here within half an hour of a node coming up.
Others report days. The more nodes in the network, the faster it is before
by disabling bgscan, you increase the length of time before ping ramping
To investigate ping ramping, I took a build and seriously reworked it.
Removed all DFS.
Used hardware beacons
Removed all uapsd code
Removed all power save code
Removed all scan code - the node comes up on the preset channel and power.
Reworked the state machine so that there are only two state transitions -
when the driver comes up and goes down.
beacon manipulations were done as part of the merge process.
Merging with a new node in the adhoc network, or dropping a node through
inactivity, does not cause a state transistion. The neighbour table simply
grows or shrinks accordingly.
Tested the essid & source mac address of all beacon packets. This way,
the driver does not merge with random nodes that have a bogus TSF.
Consequently, there are far fewer updates to the TSF value.
---->And ping ramping has stopped completely.
On Wed, 7 Jan 2009, Krzysztof wrote:
> What is the reason why there is no background scanning in ad-hoc mode?
> Check out the new SourceForge.net Marketplace.
> It is the best place to buy or sell services for
> just about anything Open Source.
> Madwifi-devel mailing list
Derek Smithies Ph.D.
IndraNet Technologies Ltd.
ph +64 3 365 6485