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[Sudesh Gowda J <>]

Hi Csaba!!

So the test cases with the scenario worked and we are able to capture the packets now. 

Thanks a lot !!

On Wed, 9 Nov 2022 at 15:30, mc36 <> wrote:

hi,
regarding the packet capture, i understand the issue now... to have all the packets,
you can write a test case and running it have the possibility to do the capture too:
"cd src ; ./tw.sh rout-bgp001 capture r1 eth1" will start a simple bgp scenario and
you'll have the packets including the initial arp/nd ones...

regading the bind failure, well, then i misguessed the issue... if you see it in the
pcapint.bin it can indicate that you need to swap the local/remote ports to have a
"connection"... if you see it during a test case, it can simply be that you're using
the same testing slot (ports, cpu cores, etc) on both of them... "./tw.sh slot 1"
can mitigate this latter...
regrading the reuseaddr, it set as a last resort... on linux, as i see it leaves the original
binding in place and the newcomer bind will take over just when the original one is gone, so
it's clearly there just to not hard error out immediately... in the pcapint it's not there
because that beast have just this single job so i felt inappropriate to set it... :)
br,
cs


On 11/9/22 10:08, Sudesh Gowda J wrote:
> Hi Csaba,
> Thank you for the suggestions.
>
> packet capture <interface_name> is working and we are getting pcap files for the same.
> But the issue with the above method is that nd usually happens as soon as the routers are spawned and it takes time to telnet into the routers and run the above command. So the
> packet capture is not able to capture the nd packets. Can you suggest a solution for this?
>
> And regarding failed to bind socket error, we actually thought this might be the case since many a times  ssh disconnects with FreeRtr simulations running. So we checked for
> processes related to freertr that were running so that we could kill them. But we were not able to find any FreeRtr related processes. Also, this happens even when we run the setup
> just after rebooting the VM.
>
> We also tried running pcapInt.bin before bringing the routers up. In this case, pcapInt binds successfully but the routers fail to run and on checking the error logs, it says that
> the ports/sockets are already in use. Is this happening due to the fact that SO_REUSEPORT option is not set for the socket and only SO_REUSEADDR  is set in this file?
> https://github.com/rare-freertr/freeRtr/blob/78074624304ede143d87da59dfbbe5bea286c982/src/net/freertr/ifc/ifcUdpInt.java
> <https://github.com/rare-freertr/freeRtr/blob/78074624304ede143d87da59dfbbe5bea286c982/src/net/freertr/ifc/ifcUdpInt.java>
>
> Thank you
>
> On Tue, 8 Nov 2022 at 22:16, mc36 < <mailto:>> wrote:
>
>     hi everyone!
>     thanks for your time and effort, please feel free to ask questions, etc here!
>     can't stand waiting for your nd findings!
>     ps: guud luck with the ietf115! :)
>     br,
>     cs
>
>
>     On 11/8/22 17:42, Priyanka Sinha wrote:
>      > Dear Csaba,
>      >
>      > Thanks so much !! Most of the folks are busy with IETF 115 ongoing in London, we should have the video as soon as they come back :-)
>      >
>      > Let me introduce you to the three students working on FreeRtr for ND6 improvements, Sudesh, Advaith and Kavya with Sudesh being the senior student. They are seniors in their
>      > bachelor of engineering course at National Institute of Technology Karnataka in India. They are doing this as part of their course project with Prof Mohit Tahiliani.
>      >
>      > I hope they will make good use of the list.
>      >
>      > Thanks again
>      > Best Regards,
>      > priyanka
>      >
>      > On Tue, 8 Nov, 2022, 22:02 mc36, < <mailto:> <mailto: <mailto:>>> wrote:
>      >
>      >        hi,
>      >        surely yess, feel free to point the students to the list,
>      >        there is always someone (mostly me or the team members)
>      >        who will pick up the thread and reply to the youngsters :)
>      >        regarding the bind issues, i encounter such when i forget
>      >        to stop the previous simulations... regarding the capturing,
>      >        freerouter have an internal tool to have the packets:
>      >        "packet capture eth1" will do the trick... it have the
>      >        advantage that it can capture on virtual interfaces like tunnels...
>      >        ps: i'm also interested in the video, please share as soon as you have it!
>      >        br,
>      >        cs
>      >
>      >
>      >        On 11/8/22 17:08, Priyanka Sinha wrote:
>      >         > Hi Csaba,
>      >         >
>      >         > Thank you so much for FreeRtr and your availability for help.
>      >         >
>      >         > The students are finding exploring the freertr very interesting. They just presented their learnings at the IETF 115 Hackathon over Zoom. Will share the video when we
>     obtain it.
>      >         >
>      >         > The students have used pcap.Init to capture packets on an interface for a simple topology but are finding it hard to do so for a complex topology. Also they are
>     running into
>      >        issues
>      >         > such as sockets binding failure.
>      >         >
>      >         > The students are running the Freertr on an azure VM for now.
>      >         >
>      >         > It would truly help us if you were to help them with the issues they encounter, apart from them working through the dev groups.
>      >         >
>      >         > If it is ok with you, I would like to make introductions with the students and yourself.
>      >         >
>      >         > Best Regards,
>      >         > Priyanka
>      >         >
>      >         > On Fri, 4 Nov, 2022, 12:45 mc36, < <mailto:> <mailto: <mailto:>> <mailto: <mailto:> <mailto:
>     <mailto:>>>> wrote:
>      >         >
>      >         >            hi,
>      >         >            excellent news!
>      >         >            please let us know if you need any help here or there... :)
>      >         >            also you're welcome on the rare-dev or rare-user lists.geant.org...
>      >         >            they should open with your eduid... if you dont have, the
>      >         >            -users list is somewhat open as it's mirrored at groups.io... (cc-ed)
>      >         >            any questions are welcomed! :)
>      >         >            sincerely yours,
>      >         >            cs
>      >         >
>      >         >
>      >         >
>      >         >
>      >         >            On 11/4/22 08:09, Nalini J Elkins wrote:
>      >         >              > Csaba,
>      >         >              >
>      >         >              > We are making some progress on starting to install and test FreeRtr.                  We hope to use it for IPv6 Extension Header testing (as we discussed
>     before!) as well as
>      >        possible
>      >         >              > improvements to IPv6 Neighbor Discovery.
>      >         >              >
>      >         >              > Let me introduce you to Dr. Priyanka Sinha.            She is leading a team of students in India.                  I hope you will be able to help her with questions.
>      >         >              >
>      >         >              > Priyanka, Csaba Mate is the Chief Developer for FreeRtr.
>      >         >              >
>      >         >              > Looking forward to lots of great work!                  Thanks to all in advance.
>      >         >              >
>      >         >              > Nalini Elkins
>      >         >              > CEO and Founder
>      >         >              > Inside Products, Inc.
>      >         >              > www.insidethestack.com <http://www.insidethestack.com> <http://www.insidethestack.com <http://www.insidethestack.com>> <http://www.insidethestack.com
>     <http://www.insidethestack.com> <http://www.insidethestack.com <http://www.insidethestack.com>>>
>      >         >              > (831) 659-8360
>      >         >              >
>      >         >              >
>      >         >
>      >
>

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