Re: [Aodvimpl] problem in aodv uu-0.93

[Stefan O. <ot...@ia...>]

Hi

Now I don't know whether this is also the problem in your case, but I
found that frequently lost routes are because HELLO packets get lost.
If, however, you update the HELLO timer in
rt_table_update_route_timeouts (which is called when 'normal' traffic is
received) this should fix the problem.

I hope it helps.

Regards
Stefan

On Tue, May 08, 2007 at 08:50:17AM +0800, xr.wang wrote:
> Hi,
>=20
> This problem I have meet when using aodv-uu-0.9.3, route frequencely rebu=
ild
> even if no mobility.
> But I found one more problem is that sometimes the kernel delete route
> unsuccessfully.
>=20
> test 1:
> --test scenario:
> --------                        -------
> |      |  <----> B <-----> |      |
> |  A  |  <----> C <-----> | D   |
> --------                        -------
> there are 2 routes from A to D: A---B---D, A----C----D.
> A ping D is ok, node A using "route -n" , 3 routes showed: A---B,  A---C,
> A---B---D.
>=20
> test2: node B power off
> A ping D is ok, node A using "route -n", 3 routes showed A---C, A---C---D,
> A---B---D.
> But A---B----D is bad route because node B is powered off.
> #cat /var/log/aodvd.rtlog
> just 2 route found: A---C, A---C---D.
> the routes information in kernel space and use space is mismatch, so I th=
ink
> that maybe
> some problems happened when delete route from kernel.
>=20
> Regards
> xr.wang
>=20
> On 5/7/07, Koojana Kuladinithi <ko...@co...> wrote:
> >
> >Hello all,
> >
> >We were using aodv-uu 0.7x versions from quite sometime without any
> >problems. Recently, we have tried to install 0.93 and found that the
> >frequent route discoveries due to the lost of hello messages (not due to
> >mobility). This does not happen in the previous versions.
> >
> >More details abt this problem as follows,
> >
> >---Test environment:
> >2 laptops (A & B), A is using the built-in intel WLAN chipset, and B is
> >using a PCMCIA WLAN card from HP.
> >Both laptops are running Debian Linux.
> >
> >---Test scenario:
> >A & B are configured to work in ad hoc mode, and aodv-uu is used for
> >route discovery.
> >A is transmitting data to B by using PING, and PING works.
> >
> >---Problem:
> >If I monitor the routing table on A by using the following command:
> >      [ watch -n 1 route -n ]
> >I find that the routing entry to B is periodically erased and added. It
> >seems that every several seconds a route error is reported, and the
> >route is removed and rediscovered.
> >I have varied the distance between 2 laptops from 1 meter to around 5
> >meters, nothing has been affected.
> >
> >This problem exists also in multi-hop case.
> >
> >Could you please tell us where the problem is, or how to get rid of it.
> >Has anybody got the same problem with 0.93 version
> >
> >Thanks.
> >
> >regards,
> >
> >Koojana
> >
> >
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--=20
Stefan Ott
http://www.ottwerk.net/

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