Re: [ipwave] IPWAVE Side Meeting

[Alexandre Petrescu <[e-mail]>]

Hi Chris,

Le 04/12/2019 à 06:23, Chris Shen a écrit :
> Hi Alex,
> 
> Here I share wireshark packet dump file from the experiment of the 
> hackathon.
> These packet information were collected during webcam streaming between 
> two DSRC-enabled laptops.

Thank you for the packet dumps.

In the dumps I can see indeed UDP/IPv6 packets, supposedly for video stream.

However, I can not see the link layer headers, like 802.11 headers; I 
only see EthernetII headers.  The link layer headers can be captured in 
monitor mode, not in normal mode.  For that, there might be a need to 
create a special interface (like wlan0 or so) with a command (maybe iw) 
and capture on that interface, instead of capturing on the normal interface.

> If you have any questions, please let me know.
> 
> BTW, when you setup your experiment platform, how did the IPv6 neighbor 
> discovery work?
> Was it automatically running, or you need to manually configure it?

ND worked fine.

We do configure manually a few things for the initial connectivity: the 
channels, the link-local addresses and some routing table entries.

'ND' has many parts: DAD, SLAAC, NS/NA, and others.

I am not sure which part of ND you doubt it might not work.

The part that I doubt very much is the following: when the card comes up 
it must send an NA for its own address, to a multicast group;  but has 
this router, and the others, joined that group already? (MLD REPORT), or 
probably not.  If yes, then that initial NA has the right effect.  If 
not (the group is not yet formed), then the effect of that NA is lost - 
another computer might form same LL address and DAD be nullified.

In our settings, such a situation could be provoked: start a car remote 
from this car, and then bring it closer.  But we never faced it, because 
we always start the cars at the same time and place.

Another part of ND that might not work as appropriate is the use of RIO 
in the RA.  We rely on these RIOs to establish IP paths between cars. 
These some times was failing in our initial tests, but we improved it, 
with some pre-learned manually configured data, and other 
pre-conditions.  We wrote software to achieve that.

SO, I am not sure which ND part you think about.

What kind of ND proble do you foresee?

Alex

> 
> 
> Thanks!
> Chris.
> 
> 
> On Wed, Nov 27, 2019 at 6:41 PM Chris Shen <[e-mail] 
> <mailto:[e-mail]>> wrote:
> 
>     Hi Alex,
> 
>     I answer your questions as follows:
> 
>         - is the manual available? ("Made a new manual for running OCB
>         mode")
> 
>     Yes, it is in the following github link:
>     https://github.com/ipwave-hackathon-ietf/ipwave-hackathon-ietf-106/blob/master/IPWAVE-Manual-Hackathon-IETF106-v0.2.pdf
> 
> 
>         - have you made a patch file?
> 
>     I didn't make patch file for this implementation.
>     Based on existing resources, there are some patch work to enable
>     OCB mode in the Linux kernel.
>     One of them is much concrete, which was made by Czech Technical
>     University
>     in Prague and Volkswagen.
>     The resource link is as follows:
>     https://ctu-iig.github.io/802.11p-linux/
>     But when I follow their instructions to configure OCB mode, there
>     are some unclear steps and some compiling errors coming out,
>     so I have modified the Makefile and explored other ways to configure
>     OCB mode, which is shown in the manual.
> 
>         - did you use a notion of QoS?  For example, can you send us a
>         wireshark 
> 
>             packet dump made in monitor mode, of the IPv6 packets used
>         for video
>             streaming between the two laptops?  These packets have
>         802.11 QoS Data
>             headers or just 802.11 Data headers?
> 
>     I didn't use QoS. For the current webcam streaming, I use gst-launch
>     from Gstreamer. This gst-launch uses UDP and RTP to stream webcam.
> 
>     I checked packet dump, there is no QoS information, so I believe the
>     packets
>     just use 802.11 Data headers.
>     I will send you the packet dump later, since I didn't save them.
> 
>         - the wifi card wilocity is on USB or is it internal to the laptop?
> 
>     For the current test, we replaced the original wifi card inside a
>     laptop
>     with an Athero wifi card using ath9k driver. This wifi card uses
>     PCIe-mini
>     interface to connect with the laptop.
>     We also use the laptop internal antennas for 5.9GHz band. Initially,
>     we are not sure if the antennas of the testing laptop can support
>     5.9GHz
>     band, so we connect the wifi card with external antennas that
>     support 5.9GHz.
>     After testing, we found that the laptop internal antennas can also
>     support
>     5.9GHz band, so we just use them.
>     If you have a USB dongle that has PCIe-mini interface, I believe an
>     Atheros wifi
>     card can work as well, but you need to have external antennas to
>     connect with
>     the wifi card on the USB dongle.
> 
>     Thanks!
>     Chris.
> 
> 
>     On Tue, Nov 26, 2019 at 9:56 PM Alexandre Petrescu
>     <[e-mail] <mailto:[e-mail]>>
>     wrote:
> 
>         Hi Chris,
> 
>         With respect to the Hackathon slides, my colleague and I would
>         like to
>         ask you:
> 
>         - is the manual available? ("Made a new manual for running OCB
>         mode")
>         - have you made a patch file?
>         - did you use a notion of QoS?  For example, can you send us a
>         wireshark
>             packet dump made in monitor mode, of the IPv6 packets used
>         for video
>             streaming between the two laptops?  These packets have
>         802.11 QoS Data
>             headers or just 802.11 Data headers?
>         - the wifi card wilocity is on USB or is it internal to the laptop?
> 
>         Yours,
> 
>         Alex
> 
>         Le 21/11/2019 à 08:13, Chris Shen a écrit :
>          > Hi its,
>          >
>          > Here I share side meeting slides for IPWAVE WG.
>          >
>          > Please join us to give your opinions and suggestions about
>         the work in
>          > IPWAVE WG.
>          >
>          > We really need your input! ^_^
>          >
>          > Thanks!
>          > Chris.
>          >
>          >
>          >
>          > On Thu, Nov 21, 2019 at 11:12 AM Mr. Jaehoon Paul Jeong
>          > <[e-mail] <mailto:[e-mail]>
>         <mailto:[e-mail] <mailto:[e-mail]>>>
>         wrote:
>          >
>          >     Hi IPWAVE WG,
>          >
>          >     There will be a side meeting for I2NSF WG's next steps
>         from 3:30PM
>          >     to 4:30PM today
>          >     at Bras Basah.
>          >
>         https://datatracker.ietf..org/meeting/106/floor-plan?room=bras-basah#raffles-city-convention-center
>          >   
>           <https://datatracker.ietf.org/meeting/106/floor-plan?room=bras-basah#raffles-city-convention-center>
>          >
>          >
>          >     The agenda for IPWAVE side meeting is as follows:
>          >
>          >     - IPWAVE Hackathon Project (Yiwen Chris Shen, 5 min)
>          >     - IPWAVE Problem Statement Draft (Jaehoon Paul Jeong, 5 min)
>          >     - Vehicular Neighbor Discovery Draft (Yiwen Chris Shen, 5
>         min)
>          >     - Vehicular Mobility Management Draft (Yiwen Chris Shen,
>         5 min)
>          >     - Security and Privacy Draft (Jaehoon Paul Jeong, 5 min)
>          >     - Context-Aware Navigator Draft (Yiwen Chris Shen, 5 min)
>          >     - Open Discussion for IPWAVE WG Progress (30 min)
>          >
>          >     The main purpose of this side meeting is to share the
>         progress of
>          >     IPWAVE PS draft and the IPWAVE hackathon project using
>         the video
>          >     delivery in the Linux system for IPv6 over IEEE 802.11-OCB.
>          >
>          >     I would like to explain the status of our WG and the
>         importance of
>          >     the IPWAVE PS draft for the next step of our WG.
>          >
>          >     Welcome your engagement and feedback.
>          >
>          >     Thanks.
>          >
>          >     Best Regards,
>          >     Paul
>          >
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>          > --
>          > Yiwen (Chris) Shen, Ph.D. Candidate
>          >
>          > Homepage: https://chrisshen.github.io
>          > IoT Lab: _http://iotlab.skku.edu <http://iotlab.skku.edu/>_
>          > Sungkyunkwan University, Suwon, South Korea
>          > Mobile:[phone]
>          > Email: [e-mail] <mailto:[e-mail]>
>          > <mailto:[e-mail] <mailto:[e-mail]>>
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> 
> 
>     -- 
>     Yiwen (Chris) Shen, Ph.D. Candidate
> 
>     Homepage: https://chrisshen.github.io
>     IoT Lab: _http://iotlab.skku.edu <http://iotlab.skku.edu/>_
>     Sungkyunkwan University, Suwon, South Korea
>     Mobile:[phone]
>     Email: [e-mail]
>     <mailto:[e-mail]>
> 
> 
> 
> -- 
> Yiwen (Chris) Shen, Ph.D. Candidate
> 
> Homepage: https://chrisshen.github.io
> IoT Lab: _http://iotlab.skku.edu <http://iotlab.skku.edu/>_
> Sungkyunkwan University, Suwon, South Korea
> Mobile:[phone]
> Email: [e-mail]
> <mailto:[e-mail]>