[Nfd-dev] additional data between ethernet header and ndn header

[Salvatore Signorello]

Hi Alex,

follow more details about my working environment:

OS: ubuntu 14.04 (it's not running into a virtual machine)
nfd: 0.3.3-14-ga714792
the interface is a virtual one whose ifconfig output is:

veth0     Link encap:Ethernet  HWaddr c2:91:c9:ee:78:77
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:21 errors:0 dropped:0 overruns:0 frame:0
           TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:1797 (1.7 KB)  TX bytes:1351 (1.3 KB)

I've also noticed that if I change the Interest name, those additional 
data maintain the same size, but they contain different values. Have you 
experienced sth like that with any older version of the software? I 
think that I'll go to update the sw to see if the problem persists.

Salvatore

On 12/15/2015 12:35 AM, Alex Afanasyev wrote:
> Hmm..
>
> Something is strange.  I have tried to capture packet on my machine (with 0.4.0-beta2-24-g25ac97f) and I'm having a different .pcap, which does not have anything between ethernet header and NDN packet:
>
>
>
>
> Can you describe the environment you're capturing packets?  Version of nfd (nfd --version), your OS, is it a VM, type of interface (wifi, ethernet, VLAN or not VLAN), output of ifconfig.
>
> ---
> Alex
>
>> On Dec 14, 2015, at 2:52 PM, Salvatore Signorello <salvatore.signorello at uni.lu> wrote:
>>
>> Hi Alex,
>>
>> the pcap is in attach. I'm not using the latest version of the software tools and daemon, so if you either don't see the issue or are not able to reproduce it. I'll likely update the ndn software suite before asking you for more support.
>>
>> Thanks,
>> Salvatore
>>
>> On 12/14/2015 11:42 PM, Alex Afanasyev wrote:
>>> Hi Salvatore,
>>>
>>> Can you attach an .pcap of a few packets you're observing?
>>>
>>> --
>>> Alex
>>>
>>>> On Dec 14, 2015, at 2:37 PM, Salvatore Signorello <salvatore.signorello at uni.lu> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> on a single machine, I generate an Interest with ndnpeek and then I sniff the veth interface my NFD has forwarded the Interest to. On wireshark (I'm using the dissector for the ndn protocol) I have 16 bytes between the ethernet header and the ndn one there are 14 bytes, what are those bytes for?
>>>>
>>>> Thanks in advance,
>>>> best,
>>>> Salvatore
>>>>
>>>>
>>>> --
>>>> Salvatore Signorello
>>>> PhD student @ SecanLab
>>>>
>>>> Interdisciplinary Centre for Security, Reliability and Trust
>>>> SnT, University of Luxembourg
>>>> http://wwwen.uni.lu/snt/people/salvatore_signorello
>> --
>> Salvatore Signorello
>> PhD student @ SecanLab
>>
>> Interdisciplinary Centre for Security, Reliability and Trust
>> SnT, University of Luxembourg
>> http://wwwen.uni.lu/snt/people/salvatore_signorello
>>
>> <packetDump.pcap>

-- 
Salvatore Signorello
PhD student @ SecanLab

Interdisciplinary Centre for Security, Reliability and Trust
SnT, University of Luxembourg
http://wwwen.uni.lu/snt/people/salvatore_signorello

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