[Olsr-dev] Feedback on current OL

[Hannes Gredler]

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.

/hannes

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
>>>
>>
> 
>