[OLSR-users] WLAN Router with two WLAN interfaces - route flappingissue

[Sven-Ola Tuecke]

Hi,

if you _have_ 2 or more ifaces e.g. over ethernet, ETX/LQ is always 1. 
Similar with Wifi in near distance. A single missing packet (happens even on 
ethernet sometimes) changes the routing then. Use linkqualitymult to 
manually priorize one iface, for example:

Interface "wifi1" {
  [...]
  LinkQualityMult default 0.5
}
Interface "wifi2" {
  [...]
  LinkQualityMult default 1.0
}

Other option: Use directional antennas. In a real-world setup with 
directional antennas and neighbours > 500 meters away no route flapping 
should occur because one of the wifi cards can be reached better from a 
certain node near your location. In a lab setting, not enough packets are 
missing...

// Sven-Ola

""Rolf Schärer"" <(spam-protected)> schrieb im Newsbeitrag 
news:(spam-protected)

Hi group,

We discovered the following issue running olsr on a WRAP board
(www.pcengines.ch) with two WLAN interfaces and one Ethernet interface:

Everything works ok if the other olsr-enabled WLAN routers (mostly
Linksys WRT54G's running a Freifunk Firmware) can only connect to one of
the WLAN interfaces of the WRAP board. Trouble starts if the other
routers connect to two WLAN interfaces...
E.g. the default-route, announced by the WRAP board, is flapping between
the two interfaces. This behaviour is an effect of the Link Quality
Extension - if it is turned off on every router, the routing is based on
hop counts and behaves ok.

My question is, whether somebody on this list has discovered the same
problems and if, what the solution was (if there's any!)

Thanks a lot.
Take care,
Rolf