March 2013 - Ibr-dtn - lists.ibr.cs.tu-bs.de

IBR-DTN default configuration file
by Dimitrios Giotas 11 Mar '13

11 Mar '13

Hello, I was wondering if it is possible to retrieve the default configuration file for the dtn daemon running in an openwrt router.I have modified the one located in /etc/config/ibrdtn and I would like to compare the changes I've made to the default one. Thank you, Regards

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Re: [ibr-dtn] Dht ibrdtn package
by Sebastian Schildt 07 Mar '13

07 Mar '13

Just a blind guess: For the OpenWRT uci magic to work you need to start ibrdtn with the supplied start script,i.e. /etc/init.d/ibrdtn restart this will convert the uci configuration to a ibrdtn configfile in /tmp and then start the daemon MfG Sebastian Am 07.03.2013 um 11:53 schrieb Dimitrios Giotas <dimigiotas(a)gmail.com>: > Hello, > > > I am having some troubles with my router which is too running openwrt. > When I run the daemon with a configuration file I don't get anything in the /tmp/ibrdtn.conf > It doesn't exist. What might be the cause of that? > I have a few more issues as well, which I will post on future mails. > Thank you. > > On Wed, Mar 6, 2013 at 4:45 PM, Sebastian Schildt <schildt(a)ibr.cs.tu-bs.de> wrote: > > > Regarding OpenWRT the "uci" systemis used for configuration, You can find that configuration file in /etc/config . This will be converted to a config file in ibrdtn syntax when the dameon is started. So if you are unsure, you can check /tmp/ibrdtn.config while the daemon is running to see which configuration is really used by an OpenWRT node. > > The DHT module allows to look up EIDs of other DTN nodes, if they are also suing DHT and have a direct internet connection. See this paper for details: > > Schildt, Sebastian, Lorentzen, Till, Morgenroth, Johannes, Pöttner, Wolf-Bastian and Wolf, Lars: Free-riding the BitTorrent DHT to improve DTN connectivity, in Proceedings of the seventh ACM international workshop on Challenged networks, CHANTS '12, New York, NY, USA, Seite 9-16, ACM, 2012 > > http://dx.doi.org/10.1145%2F2348616.2348619 > > > Sebastian > > Am 06.03.2013 um 13:26 schrieb Francisco Cuesta <ndarkness(a)gmail.com>: > >> Hello, >> >> I'm struggling with a weird fact, I can not ping from one dtn node(C) to another dtn node (A), and I cannot understand completely why. I have set the right clocks and the configuration but first I have to ping (dtnping) from A to C in order that C can ping A, if I start directly pinging from C to A the nodes cannot see each other. Indeed, looking at the log of C there aren't other dtn nodes present... The discovery_announce are set on C but I don't know how to check whether it's enabled on A (this node uses openwrt). Any hint of what's going on? >> >> Furthermore, I would like to know the functionality of DHT package, what is it used for? >> >> Thanks in advance, >> >> Ragards! >> -- >> !! 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://www.ibr.cs.tu-bs.de/mailman/listinfo/ibr-dtn. > > > -- > !! 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://www.ibr.cs.tu-bs.de/mailman/listinfo/ibr-dtn. >

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Dht ibrdtn package
by Francisco Cuesta 06 Mar '13

06 Mar '13

Hello, I'm struggling with a weird fact, I can not ping from one dtn node(C) to another dtn node (A), and I cannot understand completely why. I have set the right clocks and the configuration but first I have to ping (dtnping) from A to C in order that C can ping A, if I start directly pinging from C to A the nodes cannot see each other. Indeed, looking at the log of C there aren't other dtn nodes present... The discovery_announce are set on C but I don't know how to check whether it's enabled on A (this node uses openwrt). Any hint of what's going on? Furthermore, I would like to know the functionality of DHT package, what is it used for? Thanks in advance, Ragards!

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Re: [ibr-dtn] DTN bundle rejected issue
by Sebastian Schildt 06 Mar '13

06 Mar '13

The API error is just a debugging message and is to be expected when a client (dtnping) disconnects form the dameon when it terminates. For your observation, you probably have some problem with discovery. It is hard to guess what exactly is wrong in your setup but the behavior can be explained like this: A sees B, but B does not see A (i.e. because sending or receiving of A's discovery beacons is blocked). In this case B can not initiate a connection to A (dtnping not possible), but A can dtnping B. Once a TCPCL connection is established by A however, B becomes aware of A's existence as a neighbor, and thus it will also be able to contact A. MfG Sebastian Am 05.03.2013 um 13:41 schrieb Francisco Cuesta <ndarkness(a)gmail.com>: > Sebastian, > > thanks for your help, it was indeed an issue with time zones, one was working with GMT and the other with UTC, I have set both to UTC and now it seems to work. Though, sometime one of the nodes, the C, where I got the error I showed before (the API one) the dtnping doesn't always work properly I have to make a dtn ping from the other side and then the dntping works on the node C, any idea of this behaviour? > > Thanks again, > > Regards > > > 2013/3/5 Sebastian Schildt <schildt(a)ibr.cs.tu-bs.de> > > The default timeout for dtnping is 60 seconds. If your clocks are synchronized within one minute and you still have problems, I guess you have a problem with timezones. Normally, both hardware clocks should be set to UTC and the systems can use any timezone (even different ones). However, especially with some embedded hardware it is not always quite clear whether the hw clock is set to UTC or local time and how timezones are implemented. > > You can try by increasing the lifetime in dtnping, i.e. > > dtnping --lifetime 7260 dtn://destination/echo > > would make the bundle life for 2 hours and 60 sec, thus by playing with lifetime you can find wether there is a timezone problem, and adjust the clocks on your nodes accordingly. > > > MfG > > Sebastian > > Am 05.03.2013 um 09:17 schrieb Francisco Cuesta <ndarkness(a)gmail.com>: > >> Good morning, >> >> Looking into ibrdtn mail list, I have found a thread in which Johannes explained some way around to avoid the issues with the clock synchronization. So what I did was to run the daemon with the option --badclock and now the dtnping works fine as well as sending stuff through dtn nodes(just in one way from node 2 to node C); however, I would like to solve the issue with the clocks, could you tell me what is the precision that I would achieve with the clocks? Since, I have already set both dates on the systems with maybe a difference of few seconds, but if I disable the --badclock option then I still have that error. >> >> On the other hand, I have noticed that from one node I cannot send a ping or send data, when I try to send data I was prompted the below messages. Any tip of what's going on? >> >> BinaryStreamClient::run(): InvalidDataException (Bundle version differ from ours.) >> Tue Mar 5 08:15:56 2013 DEBUG.10: unexpected API error! Conditional has been unblocked. >> Tue Mar 5 08:15:56 2013 DEBUG.5: api connection down >> >> Thanks in advance, >> >> Francisco >> >> >> 2013/3/4 Francisco Cuesta <ndarkness(a)gmail.com> >> Hello, >> >> I'm trying to do a dtnping between two dtn nodes I have, I have noticed that they can see each other, however, when I try to make a ping from node 2 to node C, I get this warning : >> >> Mon Mar 4 13:49:45 2013 WARNING: bundle rejected: bundle has expired ([415720186.377] dtn://node2.dtn/zsKZSPktexxyNvJ -> dtn://nodeC.dtn/echo) >> Mon Mar 4 13:49:45 2013 WARNING: bundle has been rejected: bundle is expired >> >> I see the packages is discarded, but I cannot understand the reason, is it due to a bad synchronization among the clocks of the devices? How may I resolve it? >> >> Thanks in advance, >> >> regards! >> >> >> -- >> !! 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://www.ibr.cs.tu-bs.de/mailman/listinfo/ibr-dtn. > > > -- > !! 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://www.ibr.cs.tu-bs.de/mailman/listinfo/ibr-dtn. >

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Installing ibr-dtn on OpenWrt
by Dimitrios Giotas 05 Mar '13

05 Mar '13

Hello, I have installed ibrdtn on my router which is running the OpenWrt backfire 10.03.1 I am running the dtnd on the router and then trying to standalone ping it. The daemon seems to be running ok, although I get a weird error when terminating it. However when I try to ping it, it transmits no packets and when I terminate the ping I get the following error root@OpenWrt:~# dtnping dtn://OpenWrt/echo ^Cunknown error --- dtn://OpenWrt/echo echo statistics --- 0 bundles transmitted, 0 received, 0% bundle loss, time 1.52 s rtt min/avg/max = 0.00/0.00/0.00 ms Is it possible that this has something to do with the error I get when terminating the daemon? Any ideas what might be wrong? Thank you.

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DTN bundle rejected issue
by Francisco Cuesta 05 Mar '13

05 Mar '13

Hello, I'm trying to do a dtnping between two dtn nodes I have, I have noticed that they can see each other, however, when I try to make a ping from node 2 to node C, I get this warning : *Mon Mar 4 13:49:45 2013 WARNING: bundle rejected: bundle has expired ([415720186.377] dtn://node2.dtn/zsKZSPktexxyNvJ -> dtn://nodeC.dtn/echo) Mon Mar 4 13:49:45 2013 WARNING: bundle has been rejected: bundle is expired* I see the packages is discarded, but I cannot understand the reason, is it due to a bad synchronization among the clocks of the devices? How may I resolve it? Thanks in advance, regards!

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DTN2.9.0 vs IBR-DTN
by Bruno Tavares 04 Mar '13

04 Mar '13

Hello! Is there any compatibility between the dtn2.9.0 and ibr-dtn ? I was trying to use them but when i start the two daemons they do not discover each other. Thank you all Best regards, Bruno Tavares

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