- Ibr-dtn - lists.ibr.cs.tu-bs.de

Raspberry Pi
by André Sá 25 Mar '14

25 Mar '14

Hi, I am trying to use IBR-DTN between two Raspberry Pi through the wireless interface (usb dongle RTL8188CU), where one of them is configured as access point and the other one must connect to it. I followed this tutorial to configure the RPi as access point: http://www.daveconroy.com/turn-your-raspberry-pi-into-a-wifi-hotspot-with-e… ; and I am able to ping the internet through both RPis. Does Ibr-dtn work in this conditions, in which one of the nodes is configured as an access point and the other one has to connect to it? Or, the wireless interfaces have to be in ad-hoc mode? In the pictures below are the print screens from the interfaces and ibr-dtn outputs. I am not able to successful ping between them through dtnping. Raspberry Pi interfaces: (Raspberry access point) Ibr-dtn output when using the br0 interface: (Raspberry access point) Ibr-dtn output when using the wlan0 interface: (Raspberry access point) Raspberry Pi interfaces: (Raspberry client) Ibr-dtn output when using the wlan0 interface: (Raspberry client) Kind regards André Sá

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Recompile and install IBR-DTN from source in OpenWRT
by Theodoros Bourchas 17 Mar '14

17 Mar '14

Hi, I would like to install IBR-DTN from source in OpenWRT. I have tried to download it directly using the commands found here https://trac.ibr.cs.tu-bs.de/project-cm-2012-ibrdtn/wiki/source, under GIT repository. An error occurred while cloning: fatal: Unable to find remote helper for 'https' git openwrt Can I recompile it directly in Openwrt ? Or, if I follow these commands and install it in Ubuntu 12.04, how I plug it in OpenWRT after that? Thanks, Theodoros

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Fwd: Re: Epidemic routing - bundle size issue
by Sandra Siby 17 Mar '14

17 Mar '14

---------- Forwarded message ---------- From: "Sandra Siby" <sandrasiby(a)gmail.com> Date: Mar 17, 2014 2:58 PM Subject: Re: [ibr-dtn] Epidemic routing - bundle size issue To: "Johannes Morgenroth" <morgenroth(a)ibr.cs.tu-bs.de> Cc: Hi Johannes, I have run it several times and am able to replicate the issue. The contact times are not long enough for all bundles to be transmitted but this is what we want. We are ok with bundles being of different sizes as long as the entire amount of data is received at the end (meaning reactive fragmentation works). There were no errors or warnings in the logs. However, we are using version 0.10.2 (we're running all this in openwrt by the way). Can you tell me which version to use and where I can find it? Thank you! Regards, Sandra On Mar 17, 2014 2:45 PM, "Johannes Morgenroth" <morgenroth(a)ibr.cs.tu-bs.de> wrote: > Hello Sandra, > > in this case is have no concrete idea. There might be a possible hash > collision in the summary vector bloom-filter, but this is very unlikely. > What about the contact times? Were they long enough to transmit all the > bundles? The bundles with the wrong size may be a result of interrupted > connections. > > Did you checked the daemon log output for errors or warnings? You could > check the exact behavior using the log files. Did you run the test a > second time with the same result? And finally, which version of the > daemon do you use? There are known bugs in the 0.10.2 related to > fragmentation (fixed in development branch). > > Kind regards, > Johannes > > Am 17.03.2014 14:33, schrieb Sandra Siby: > > Note that there is no 'additional fragment'. There is an equal number of > > fragments on both sides but their size distribution is different. And if > > you add up the sizes of fragments obtained on the receiver side, it is > > less than the total at the sender side. In other words, I think the > > entire file is not sent. I am unable to extract the file to the > > application layer. > > > > Any idea why this is the case? > > > > > -- > Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund > Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 > Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig > -- > !! This message is brought to you via the `ibr-dtn' mailing list. > !! Please do not reply to this message to unsubscribe. To unsubscribe or > adjust > !! your settings, send a mail message to <ibr-dtn-request(a)ibr.cs.tu-bs.de> > !! or look at https://mail.ibr.cs.tu-bs.de/listinfo/ibr-dtn. >

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Epidemic routing - bundle size issue
by Sandra Siby 17 Mar '14

17 Mar '14

Hi, We have the following test scenario: 2 fixed nodes (a sender and a receiver) A and D and 2 mobile nodes, B and C, moving between them. B and C start from A and D respectively and move towards each other. They are in contact for a short duration in between A and D. When they are in contact, they do not have any contact with the fixed nodes. We send data from A and use the mobile nodes to carry the bundles to D. The configuration we were using is epidemic routing and we send a file of 12MB, fragmented proactively in 1MB payload size. At the sender, we get 12 bundles of 976.7K and 1 bundle of 569.3K. We assumed that the same number of bundles with identical sizes will be at the receiver. However, after all the bundles have been delivered at the receiver, we see that there are 11 bundles of 976.7K, 1 bundle of 12.1K and one bundle of 540.1K. Is it normal for there to be a discrepancy in the bundle sizes on both sides? If so, why is there a difference? Note that we do not run the dtninbox application on the receiver side to extract the file to the application layer. It would be great if you could also give us a short description of how epidemic routing is implemented in your code. Regards, Sandra

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Bundle Order
by Theodoros Bourchas 12 Mar '14

12 Mar '14

Hi, My experimental scenario is the following one: I have a sender and a receiver node that are not in contact with each other and a mobile node (intermediate) that takes bundles from the sender in a contact interval of some minutes and delivers them to the receiver in another contact interval. I use proactive fragmentation. I have a big file of 200MB and I fragmented to bundles of 100KB. So, on the sender side (temporary bundle directory) I have 2098 bundles (of 97.7KB approximately). I want to know in what order bundles are created and sent in the temporary folder on the sender/intermediate/receiver side. For example, if one bundle is not received completely, does it remain in the temporary folder of the intermediate node? And if this is the case, it remains on top of the transmission queue (so it would be the first bundle sent in the next contact) New bundles that are received and stored in the temporary directory of the intermediate node would be first in the queue? Thanks, Theodoros

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Recording info about transmissions between nodes
by Luís Carlos Guedes 12 Mar '14

12 Mar '14

Hello, Our goal is to use IBR-DTN in a small testbed (50nodes), where we will do measurements and calculate statistics about the moments when the bundles are sent, received, and transfered from node to node (including information such as the source node, destination node, amount of data transfered), for example, this situation from NodeA to NodeB, passing throw NodeC: Emitter: "BundleX SENT from NodeA to NodeB" Receiver: "BundleX_Received from NodeA - completed (10MB)" (or, in case of 3 nodes): in nodeC: "transferofbundle (10MB) from NodeA to NodeB - completed" We want to store this information in a file as small as possible, so we need to find the logging instructions for these events in the code, so as to also log to our own file each time one of these events happens (and thus avoid recording and storing all the other log messages). We have studied the code, but it is hard to find these things clearly, as the logging seems to use several different routines and sub-routines. If you could point us to the most important code files that we should look into and change so as to log these informations into our own log file, that would be very helpful. Thank you, Luís Guedes

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Multicast discovery_address
by Maël Auzias 10 Mar '14

10 Mar '14

Hi, When the discovery_address is set to either 192.168.0.255 (nodes are on the network 192.168.0.0/24), or 255.255.255.255 an error message appear: IPNDAgent : join failed on wlan0; 22 : setsockopt() Can't the discovery_address be set to something else than 224.0.0.x ? Thanks for further replies! Have a nice day.

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Multi EID per node
by Maël Auzias 10 Mar '14

10 Mar '14

Hi (again), I wish my nodes to have more than one local EID. How can it be set ? In the conf file if there are 2+ local_uri just the last one is used. I use then a group where there is only one node. Something like dtnrecv --group dtn://singleton/node01/sensor, but is there any other way to make it *cleaner* ? Note: I have the same issue with DTN2. Thanks for further replies! Have a nice day.

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Discovery version 0 issue
by Maël Auzias 10 Mar '14

10 Mar '14

Hi (again again), When the IBR-DTN nodes are set to use the discovery_version =0, which is DTN2 compatible, the IBR-DTN nodes do not discovery each others. When a bundle from an IBR-DTN is sent to another IBR-DTN node the bundle goes through a DTN2 node (flooding routing) to reach the destination even though they are in the Wi-Fi range. Is that a known issue ? Did someone got the same ? How to manage it ? Thanks for further replies! Have a nice day.

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log files information
by Luís Carlos Guedes 10 Mar '14

10 Mar '14

Hello, I would like to know where (in which files) you make the logs files because i wanted to collect some extra information each time a bundle is sent/ transfered/ delivered. Thank you in advance,Luís Guedes

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