[Nfd-dev] additional data between ethernet header and ndn header
Salvatore Signorello
salvatore.signorello at uni.lu
Tue Jan 5 08:25:09 PST 2016
Hi Junxiao,
sorry to come back to you on this thing again, I know that I should
simply update my software which is outdated.
Now I see a Data packet generated by ndnpoke (some software versions and
OS listed in the previous mail) that contains the following:
50:fd:01:83:51:08:00:00:00:00:00:00:00:00:54:fd:01:75:06:fd:01:71:07:22
which, according to your previous hypothesis, could be decoded like:
50 fd // NdnlpData
01 83 // ????
51 08 // NdnlpSequence
00 00 00 00 00 00 00 00
54 fd // NdnlpPayload
01 75 // again ????
06 fd // Data
01 71 // ibid
07 22 // name
In addition, as you can see the 'fd' length value is never
decremented...this sound a bit weird. Any idea?
Best,
Salvatore
On 12/15/2015 04:37 PM, Junxiao Shi wrote:
> Hi Salvatore
>
> The payload of the first packet in the pcap
> is 50:37:51:08:00:00:00:00:00:00:00:11:54:2b:05:29:07:21:08:10:70:34:73:6f:66:74:77:61:72:65:73:77:69:74:63:68:08:0d:73:61:79:68:65:6c:6c:6f:77:6f:72:6c:64:0a:04:10:f2:e0:8f.
> This appears to be NDNLPv1-TLV
> <http://redmine.named-data.net/projects/nfd/wiki/NDNLP-TLV> protocol,
> and can be interpreted as:
>
> 50 37 // NdnlpData
> 51 08 // NdnlpSequence
> 00 00 00 00 00 00 00 11
> 54 2b // NdnlpPayload
> 05 29 // Interest
> 07 21 // Name
> 08 10 // NameComponent
> 70 34 73 6f 66 74 77 61 72 65 73 77 69 74 63 68
> 08 0d // NameComponent
> 73 61 79 68 65 6c 6c 6f 77 6f 72 6c 64
> 0a 04 // Nonce
> 10 f2 e0 8f
>
> Neither ndndump nor NDN dissector for Wireshark supports NDNLPv1-TLV.
> In latest NFD, NDNLPv1-TLV is deprecated and replaced by NDNLPv2
> <http://redmine.named-data.net/projects/nfd/wiki/NDNLPv2>, which will
> be supported by NDN dissector for Wireshark in #3197
> <http://redmine.named-data.net/issues/3197>.
>
> Yours, Junxiao
>
> On Mon, Dec 14, 2015 at 3:52 PM, Salvatore Signorello
> <salvatore.signorello at uni.lu <mailto: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
>
--
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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