[Olsr-dev] [Olsr-users] olsrd (and earlier) ipv6 problems

Saverio Proto (spam-protected)
Fri Mar 28 10:11:49 CET 2014

Hello Russel,

looking at this:

it looks like IPv6 routes are removed from the olsrd database. So I is
actually the olsrd daemon involved.

do you know if there is a previous stable version of olsrd where this
bug/behaviour is not present ?

In my opinion the fastest way to track the bug is to try different
versions of olsrd with "git bisect" method.

The first step is to tell us if there is a version of olsrd that is
not affected by this problem.


I cc: olsrd-dev


2014-03-27 10:37 GMT+01:00 Russell Senior <(spam-protected)>:
>>>>>> "Henning" == Henning Rogge <(spam-protected)> writes:
> Henning> On 03/26/2014 07:41 PM, Russell Senior wrote:
>>> Anybody get a chance to look at the strace?  I see a:
> Henning> strace and packet dumps are much too lowlevel to directly
> Henning> hunt problems like this. Thats why Saverios question about
> Henning> txtinfo good, because it gives you a much more high-level
> Henning> view on what is going on.
> I had not installed the modules previously, so that interface wasn't
> immediately available.  It is now.
> [...]
> Henning> Okay, lets get back to the high-level view.
> Henning> To interpret the events you described we need a list of
> Henning> nodes, with their interface IPs and the connectivity between
> Henning> them.
> Here is the list of neighbors of 2001:470:e962::407.  The addresses
> listed are on the public wifi.  The OpenVPN addresses of each node are
> a permutation, e.g. if the public wifi addr is 2001:470:e962:wxyz::1,
> then the OpenVPN address of the node is 2001:470:e962::wxyz.
> None of the nodes connect directly, everything goes through ::407.
> From curl -6 http://localhost:$port/neighbors
>   https://personaltelco.net/~russell/olsrd/olsrd-neighbors.txt
> Henning> I am also a bit worried about your usage of bridges
> Henning> connected to mesh interfaces.  Normally you should no bridge
> Henning> any interface that OLSR uses for meshing.  Mixing routing
> Henning> (L3) and bridging (L2) can go wrong in very creative ways.
> I don't understand how the bridges could be a problem in this case.
> This is a hub and spoke topology.  One openvpn server in the middle,
> nodes at the edges.  None of the nodes interconnect otherwise.  Olsr
> is broadcast on the wifi in case there are any olsrd devices nearby,
> but, again, there is no overlap in the wifi coverage (and if there
> were physically, they are on different SSIDs and wouldn't overlap
> logically).
> Can you explain more about what in particularly would make you worry?
> This configuration has been stable for us on ipv4 for years and also
> on ipv6 until very recently, since late 2012 at least.  So, I suspect
> a bug.  Somewhere.
> Henning> Txtinfo output would be good (especially /route) would be
> Henning> good to see...  before the problem, during the problem and
> Henning> after the recovery.
> I'm using curl -6 http://localhost:$port/routes to get the following
> data, before, during and after turning on an ipv6 olsrd on a
> particular node (2001:470:e962:11c1::1).
>   https://personaltelco.net/~russell/olsrd/olsrd-routes-before.txt
>   https://personaltelco.net/~russell/olsrd/olsrd-routes-during.txt
>   https://personaltelco.net/~russell/olsrd/olsrd-routes-after.txt
> Henning> It would also help if you can reduce the number of nodes
> Henning> while still replicating the problem to a minimum.
> I don't have that level of control, unfortunately.  When I notice that
> the ipv6 routes have collapsed, I pick a likely seeming node (maybe
> because it had been plugged in recently) and turn off ipv6 olsrd, and
> over 30-60 seconds, magically the routes all come back.  My luck in
> guessing the right node to turn off is a little bit "too good", if you
> know what I mean, so that I am not sure there is anything particularly
> unique about the node I choose.  But, nevertheless, turning it off
> seems to help, generally.
> FWIW, I'm including olsrd versions here.  The central machine ::407 is
> running, compiled from the tarball.  The nodes have the
> following versions, all built from openwrt routing feed sources.
>   https://personaltelco.net/~russell/olsrd/olsrd-versions-by-node.txt
> Here is a table listing the frequency of each openwrt version:
>       1 0.6.3-3
>      33 0.6.4-1
>       1
>       1
>       7
>       1
>       2
>       2 0.6.6-2
>       7 0.6.6-3
>      11
> --
> Russell Senior, President
> (spam-protected)
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> Olsr-users mailing list
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