On Wednesday 22 July 2015 15:26:23 Carlos Meralto wrote:

Hi guys,

I'm trying to make a study of various protocols for WMN and one of them is BATMAN. One the tests is the time to recovery in case of node fail.

I have a topology with 4 routers with 2 possible paths: A-B-C A-D-C

For the test i'm doing a continuous ping from A to C (level 3 ping) and shut down the router that forward the message (i.e B or C). In this test BATMAN can't recover the PING. But when i cancel the ping and check the Originators table (batctl o) the route is refreshed. And when i try to ping again it works.

Is any limitation in BATMAN for recovery in a continuous PING?

No, sounds more like you are not using batman-adv. Because batman-adv doesn't know about the l3 stuff. It just transfers ethernet frames from A to C. B and D are chosen automatically for each frame (and not for a l3/l4/... connection).

A `batctl o` does not trigger any route re-calculation.

You can use batctl ping with -R to see the hops and the switch of the route when D fails.

Btw. if you have a setup with many dynamic changes then you may want to reduce the originator interval on each node.

Has anyone done this type of test and values obtained?

Yes, there is a long list of papers doing such things with batman-adv, bmx, olsrd, babel, ...

And the fall-over worked fine in my last tests. There is always a small time before the disappeared node is detected by the tq metric but it is nothing breaks normal connections.

Kind regards, Sven