[Babel-users] 0.92 Flapping Routes

[Juliusz Chroboczek]

> I've built a test bed based on OpenWRT trunk and babel 0.92, i set up
> 2 gateways and 1 client the client node continually flips back and forth
> between both gateways constantly 1 gateway as a test is actually about
> 5 meters away from the client AP, the other is about 60 meters away
> stationed outside the lab.

> I would think looking at the data coming from iwlist ath2 scan

Babel doesn't use link-layer link quality estimation (which is what you get
from iwlist scan), it monitors lost packets itself.

> still every 30-45 seconds itll switch for 5-10 seconds then back again.

There are two possibilities that I can think of.  One is that you've got
some periodic interference that fools-up Babel's link-quality estimation.

The other is that you're running two instances of Babel at the same time on
the same node, which would cause your neighbours to behave as you describe.

So could you please

1. check that every node is running just the one copy of Babel;

2. on every node, do

    kill -USR1 $(cat /var/run/babel.pid)

which will dump Babel's tables to its log file.  Please send the results to
the list, so I may have a look at them.

Thanks for your help,

                                        Juliusz