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

IBR-DTN release 0.6.1
by Johannes Morgenroth 30 Mar '11

30 Mar '11

Hi. We got a new release of IBR-DTN. Attention: The debian repository has moved to support more distributions! - use libdaemon to daemonize on debian - new tool: dtnstream... stream data across a DTN! - handle interface up/down or address change by dynamic bind on addresses - Fix: requeue bundles in transit For more information visit this page: http://www.ibr.cs.tu-bs.de/projects/ibr-dtn/ Regards, Johannes -- Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig

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IBR-DTN release 0.6.0
by Johannes Morgenroth 23 Mar '11

23 Mar '11

Hi. We got a new release of IBR-DTN, OpenWRT packages for Backfire ar71xx and finally Debian packages in a separate repository! Major changes: - Bundle Security Protocol - IPv6 support - Use regular expressions for static routes - New routing messages for epidemic routing (not compatible with older versions) Minor changes: - libnl is no longer mandatory - SQLite bundle storage will accept custody for bundles - Deliver bundles according to their priority - Static routing can be used with any other routing scheme - Some uClibc related fixes - Better handling of the same convergence layer on multiple interfaces - DTN2 compatibility fix for discovery - Bind on any interface is possible now For more information visit this page: http://www.ibr.cs.tu-bs.de/projects/ibr-dtn/ Regards, Johannes -- Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig

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Epidemic routing
by Harsha Chenji 21 Mar '11

21 Mar '11

Hello all, I was trying to get some epidemic routing working using 0.4.4. However, I always see in the logs that the bundles expire, irrespective of when they were sent. Is there any config parameter that controls the epidemic routing timeout? Has there been any bugfixes w.r.t this in version 0.6? Harsha

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API for custody transfer
by Harsha Chenji 02 Mar '11

02 Mar '11

Hello all, Does anyone have a sample DTN app which handles custody transfer? I looked though the source code, but all I see w.r.t custody transfer is in the storage section of the code. Just like b.setPriority, is there a function like b.requestCustodyTransfer? Thanks, Harsha

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API port - global listen
by Harsha Chenji 20 Feb '11

20 Feb '11

Hello all, Is there any way to make the dtnd API listen on 0.0.0.0:4550 instead of 127.0.0.1? If yes, is there a UCI option in openwrt? Thanks

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Re: [ibr-dtn] Need your help about ibr_dtn. dtnping failed
by Johannes Morgenroth 18 Feb '11

18 Feb '11

Hello Ke Meng. One important thing with IBR-DTN is, that the node must have discovered each other. The discovery mechanism uses broadcast/multicast UDP beacons to detect another node. If this is not working, a bundle never gets forwarded. To check if the nodes has discovered each other check the log output. There have to be NodeEvent saying node xyz is available. You can force this by define a static node like in the example configuration. But be aware that this defines a static node and will not work disruption tolerant. To solve your issue, you should check if broadcast/multicast is working in your setup. You could use tcpdump to listen on UDP packets addressed to port 4551 and check if they arrive at the other host. That is the default discovery port in IBR-DTN. Lets say something to the "localhost dtnping"-thing. An alias like localhost do not exist in IBR-DTN. To use dtnping locally, you have to call dtnping with the correct local hostname AND the application to send the bundles to. In your case this would be "dtnping dtn://OpenWrt/echo". Best regards, Johannes Morgenroth Am 17.02.2011 20:22, schrieb Meng, Ke: > Hi Johannes, > > I'm trying to use ibr_dtn under openwrt, however failed to get through by dtnping. There are few guide about how to use ibr_dtn in the internet. Could you help me with that. > > I compiled the openwrt with ibr_dtn and used it in the virtualbox. Two virtual machines were created with bridge to connect each other. The ping command is successful. However, the dtnping always failed. Here is one of the ibr_dtn configuraton: > > local_uri = dtn://openwrt1.dtn > routing = default > blob_path = /tmp/ibrdtn/blobs > storage_path = /tmp/ibrdtn/bundles > statistic_type = stdout > statistic_interval = 2 > statistic_file = /tmp/ibrdtn.stats > net_lan0_type = tcp > net_lan0_interface = eth0 > net_lan0_port = 4556 > net_interfaces = lan0 > > > By the way, the dtnping also failed to the localhost(127.0.0.1). Do you think there are other things I need to consider? > > When I use debug mode, one side shows: > Thu Feb 17 18:43:14 2011 NOTICE: BundleReceivedEvent: Bundle received [351283394.7] dtn://OpenWrt/echo-client -> dtn://openwrt1.dtn > Thu Feb 17 18:43:14 2011 NOTICE: QueueBundleEvent: New bundle queued [351283394.7] dtn://OpenWrt/echo-client > Thu Feb 17 18:43:14 2011 NOTICE: BundleEvent: bundle [351283394.7] dtn://OpenWrt/echo-client received > Thu Feb 17 18:43:45 2011 NOTICE: BundleEvent: bundle [351283394.7] dtn://OpenWrt/echo-client deleted > Thu Feb 17 18:43:45 2011 NOTICE: BundleExpiredEvent: Bundle has been expired [351283394.7] dtn://OpenWrt/echo-client > > The other side shows nothing. > > > Thanks a lot. > > Ke Meng -- Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig

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Re: [ibr-dtn] Fwd: Neighbor discovery in IBR-DTN
by Johannes Morgenroth 10 Feb '11

10 Feb '11

Hi. I think the periodically sent data you had observed are tcp keepalive beacons. Send by the tcp protocol stack itself. Those beacons contains exactly one byte. The summary vector exchange is done by sending real bundles (over tcp, udp or whatever convergence layer you use) with an attached special extension block to the discovered peers once them has been discovered and then only if they change. The extension block itself has an identifier and a string with the phrase "epidemic routing" in it. Additionally, it contains a bloom-filter as summary vector, like proposed in the paper introducing epidemic routing. In future releases this behavior will change and summary vector will be requested by other peers. Then the bundle contains the data as payload, no longer as extension block. Best regards Johannes > Von:< > > > Datum: 9. Februar 2011 21:05:55 MEZ > > An: "Sebastian Schildt"<schildt(a)ibr.cs.tu-bs.de> > > Betreff: Re: [ibr-dtn] Neighbor discovery in IBR-DTN > > > > Hi, > > > > I was able to set up the discovery mechanism after making the > > changes you suggested in the configuration file. > > > > I wanted to know more about summary vectors.How are they > > exchanged?I turned on Wireshark and found that after UDP > > beacons are sent,there is some TCP data stream being sent > > periodically.Is that the summary vector exchange?When I try to > > monitor these streams closely,I get some information saying > > that 1 byte data was sent(character @).What does this mean? > > > > Thanks > > Neha Paranjape > > Graduate Student(Telecommunications) > > University of Maryland,College Park -- Johannes Morgenroth Institut fuer Betriebssysteme und Rechnerverbund Tel.: +49-531-391-3249 Muehlenpfordtstrasse 23 Fax.: +49-531-391-5936 TU Braunschweig D-38106 Braunschweig

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Neighbor discovery in IBR-DTN
by parneha＠umd.edu 02 Feb '11

02 Feb '11

Hi, I added tcp convergence layer and routing = epidemic to my conf file.I did not add any static nodes.This was done on two laptops. Now,when I started both the daemons,I was expecting the NodeEvent log but I did not get any.This means that the two laptops have not discovered each other,correct? The next time I run both the daemons I add static connections between them in their conf files.Now I see the NodeEvent log and the connection event.What could be the reason for this?How did it give these logs when I added the static nodes? Does this mean that nodes with static connections to them are discovered as up or down and the others are not?I am kind of confused here. Neha Paranjape Graduate Student(Telecommunications) University of Maryland,College Park

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Neighbor discovery in IBR-DTN
by parneha＠umd.edu 31 Jan '11

31 Jan '11

Hi, I am trying to study the neighbor discovery mechanism in IBR- DTN.Is there any documentation on this other than the internet draft on IPND?How do we enable the nodes to send beacons and discover neighbors through the configuration file? Whenever I write static connection to other nodes,I get a number of CurNeighbors.If I comment out this part,the daemon says CurNeighbors says 0. I want to know how the node in this case (with CurNeighbors 0) and routing set to epidemic discover other nodes?How are the summary vectors sent?(Note:in this case I see no exchange of messages in wireshark ) Neha Paranjape Graduate Student(Telecommunications) University of Maryland,College Park

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Routing clarification
by Harsha Chenji 27 Jan '11

27 Jan '11

Hello list, I am trying to get some DTN routing working in the lab. My question is: Does IBR-DTN insert any routes into the kernel routing table? After neighbor discovery, how does dtnd store the neighbor info? Do I need to run OLSR or similar adhoc routing protocols along with dtnd? I know for sure that OLSRd for OpenWRT inserts some routes into the kernel. I ask because I am afraid that dtnd relies on the kernel routes to send a packet down the stack (which may contain a route to the desired DTN destination node via a long route through other neighbors - this may result in the packet going on a longer route instead of the source node waiting till the destination comes within range). Harsha

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