[Olsr-dev] Feedback on current OL

Hannes Gredler (spam-protected)
Mon Jun 9 11:48:36 CEST 2008

hmm (as bernd has stated) olsrd just passes any outgoing OLSR packet down the UDP
network stack and relies on the kernel (or a offload driver)
to calculate the UDP checksum.

looks like something is broken there.


David Murray wrote:
> Quoting Hannes Gredler <(spam-protected)>:
>> david,
>> did you see UDP checksum errors in outgoing or incoming packets ?
> They are outgoing hellos. The interface is an Ethernet Interface.
>> /hannes
>> David Murray wrote:
>>> Hi guys, just a bit of feedback on the latest development branch 
>>> found here [1]. I have had it running in my test setup (8 dual radio 
>>> ALIX nodes) for about 3-4 days. It seems to be working great, 
>>> however, one problem I have found is with the the metric.
>>> Currently, I have a 100mbit Ethernet link that is being given a 
>>> metric of ~1.150. Iperf shows that this link provides ~100 mbit which 
>>> means that there is nothing physically wrong with the link. To 
>>> investigate a little further I pulled up wireshark and took a look at 
>>> the OLSR hellos.
>>> The wireshark output was showing some UDP checksum errors "maybe 
>>> caused by UDP checkum offload" on some olsr hello packets. Perhaps if 
>>> anyone else is using this branch they could confirm whether they are 
>>> also getting the errors or if it is something specific with my 
>>> equipment.
>>> Thanks
>>> Dave
>>> [1] http://gredler.at/hg/olsrd/archive/tip.tar.gz

More information about the Olsr-dev mailing list