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

Improvement in the Fragmentation
by Luís Carlos Guedes 12 Dec '13

12 Dec '13

Hello, I wanted to make an improvement related to the fragmentation process. The fragmentation process is made node by node, which limits the efficiency of IBR-DTN. This process can be improved, by enabling the different parts of a bundle that could be received by a destination from different nodes. For example, a node A has a bundle to send to node D. First, 30 percent of the bundle are sent to node B and then 70 percent are sent to node C. Then i want that node D is able to receive the fragments from B and C and reassemble them together. Do you have some idea how can i do this?Is it and issue of the DTN or in the protocols of routing? Thank you in advance,Luis Guedes

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IBR-DTN strange behaviour on Android
by Guilherme Rolim 28 Nov '13

28 Nov '13

Hello, I've developed an app that sends informations via IBR-DTN bundles on broadcast. It was working fine on the first hour of test, but sometime later, the DTN bundles stopped being received by my app. When I restarted my phone and restarted the app all the bundles suddenly were received. Does anyone know what may be causing this kind of behaviour? Since that happened, the reception of bundles stopped working fine as it was on the first hour of tests. Thanks in advance, Guilherme Rolim

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ERROR IPNDAgent: join failed on eth0; 99: setsockopt()
by Adriano Galati 18 Nov '13

18 Nov '13

Hello, I have just installed ibr-dtn on openWRT. I execute dtnd in this way dtnd -c /tmp/ibrdtn.config but I get this ERROR ERROR IPNDAgent: join failed on eth0; 99: setsockopt() Does anybody know why? Any comment/help is very much appreciated. Thank you very much, Adriano In my config file net_lan0_interface = eth0 and my network configuration root@ALL0315N:~# ifconfig br-lan Link encap:Ethernet HWaddr 00:0F:C9:0B:34:09 inet addr:129.132.11.245 Bcast:129.132.11.255 Mask:255.255.255.192 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:977556 errors:0 dropped:202552 overruns:0 frame:0 TX packets:222313 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:158552701 (151.2 MiB) TX bytes:43248219 (41.2 MiB) eth0 Link encap:Ethernet HWaddr 00:0F:C9:0B:34:09 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:986264 errors:0 dropped:5893 overruns:0 frame:0 TX packets:222372 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:172968447 (164.9 MiB) TX bytes:43251389 (41.2 MiB) Interrupt:4 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:476 errors:0 dropped:0 overruns:0 frame:0 TX packets:476 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:50216 (49.0 KiB) TX bytes:50216 (49.0 KiB) wlan0 Link encap:Ethernet HWaddr 00:0F:C9:0B:34:08 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:760419 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:0 (0.0 B) TX bytes:142658599 (136.0 MiB) ------------------------------------------------------------------------------------------------------ root@ALL0315N:~# cat /etc/config/wireless config wifi-device 'radio0' option type 'mac80211' option macaddr '00:0f:c9:0b:34:09' option hwmode '11ng' list ht_capab 'SHORT-GI-40' list ht_capab 'TX-STBC' list ht_capab 'RX-STBC1' list ht_capab 'DSSS_CCK-40' option noscan '1' option country 'CH' option channel '1' option htmode 'HT40+' config wifi-device 'radio1' option type 'mac80211' option macaddr '00:0f:c9:0b:34:08' list ht_capab 'SHORT-GI-40' list ht_capab 'TX-STBC' list ht_capab 'RX-STBC1' list ht_capab 'DSSS_CCK-40' option country 'CH' option noscan '1' option channel '1' config wifi-iface option device 'radio1' option network 'lan' option key 'MOSAIC2B' option ssid 'MOSAIC2B1' option mode 'ap' option encryption 'none' ------------------------------------------------------------- root@ALL0315N:~# cat /etc/config/network config interface 'loopback' option ifname 'lo' option proto 'static' option ipaddr '127.0.0.1' option netmask '255.0.0.0' config interface 'lan' option ifname 'eth0 eth1' option type 'bridge' option _orig_ifname 'eth0 eth1 radio0.network1 wlan0' option _orig_bridge 'true' option proto 'dhcp' option hostname 'drz-mosaic2b1'

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configuration file
by Adriano Galati 15 Nov '13

15 Nov '13

Hello, I am running ibrdtn on openWRT. It seems that when I launch dtnd -c /etc/config/ibrdtn it is not loading the configuration file "ibrdtn". I uncommented the hostname to be dtn://node,dtn but I get "dtn://ALL0315N" (see below). Any help please? Besides, where can I find "dtnd" documentation and which options to use and how? thank you very much in advance, best, Adriano root@ALL0315N:~# dtnd -c /etc/config/ibrdtn Fri Nov 15 12:22:04 2013 INFO Configuration: Configuration: /etc/config/ibrdtn Fri Nov 15 12:22:04 2013 INFO NativeDaemon: IBR-DTN daemon 0.10.2 (build 1d89427) Fri Nov 15 12:22:04 2013 INFO Configuration: Configuration: /etc/config/ibrdtn Fri Nov 15 12:22:04 2013 INFO BundleCore: Local node name: dtn://ALL0315N Fri Nov 15 12:22:04 2013 INFO BundleCore: Forwarding of bundles enabled. Fri Nov 15 12:22:04 2013 INFO NativeDaemon: using bundle storage in memory-only mode Fri Nov 15 12:22:04 2013 INFO NativeDaemon: API initialized using tcp socket: loopback:4550 Fri Nov 15 12:22:04 2013 INFO DiscoveryAgent: listen to [ff02::142]:4551 Fri Nov 15 12:22:04 2013 INFO DiscoveryAgent: listen to [224.0.0.142]:4551 Fri Nov 15 12:22:04 2013 INFO NativeDaemon: Using default routing extensions

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Fragmentation
by Luís Carlos Guedes 13 Nov '13

13 Nov '13

Hello, Can you please tell me where can I see(in the code) the place where you did that configuration; "If A meets B again(for the 2nd time) the remaining fragment X' is forwarded. In case node A meets another peer, the complete bundle X is forwarded."Because in order to send information from A to B through 2 different nodes (and join them in the node B) i need to send through the second node just that X' and not the complete bundle as is already implemented. Besides that i wanted to know how do you implement in the code to join the information (from 2 or 3 fragmentations), to they become just one bundle like in the beginning. Thank you in advance,Luís Guedes

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Android application : eterogeneous DTN implementations communications
by Mirco Nani 06 Nov '13

06 Nov '13

I am an italian student from "Alma Mater Studiorum Bologna" university and I am writing a DTN aware application for Android. I am trying to send bundles to another DTN implementation (DTN2.9) however i can't find a way to make visible the other implemetation to the IBR discovery protocols. Is there a way in IBR-DTN for android to address bundles by IP similarly to the "addLink" or "addConnection" command for the IBR Unix Deamon implementation? I am also trying to receive bundlers from DTN2.9 implementation so I'd like to know if there is some documentation on discovery protocols used by IBR-DTN deamon.

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