Thank you very much Stephan. Changing net_lan0_type = udp to: net_lan0_type = dgram:udp does the trick! (i.e. dtnping and dtnsend work). Nevertheless i can see that datagrams, just as you said, uses IPv6 addressing. Is there a possibility to somehow use IPv4 ? This problem is similar to this thread(http://permalink.gmane.org/gmane.network.ibrdtn/1017) Thank you again for your valuable help Stephan. Best Regards, Michał Dnia 17 grudnia 2015 10:50 Stephan Rottmann <rottmann@ibr.cs.tu-bs.de> napisał(a): Hi, AFAIK should dgram:udp used instead of udp. But to get discovery working, IPv6 might be needed, IIRC. Are you launching dtnd with the option -v? This one is needed to see if neighbors are discovered. Best regards, Stephan Am Mittwoch, den 16.12.2015, 20:27 +0100 schrieb mazur221: > Hi, > > i connected 2 laptops (LAN). Both computer have network interface > eth0. > I installed also IBRDTN(IBR-DTN daemon 1.0.1 (build 294b543)) on both > computers (via apt-get install in UBUNTU 14.04.2 LTS). > > I tested epidemic, flooding and prophet routing protocols > > root@vm1:/# dtnping dtn://vm2/echo > ECHO dtn://vm2/echo 64 bytes of data. > 64 bytes from dtn://vm2/echo: seq=1 ttl=30 time=36.39 ms > 64 bytes from dtn://vm2/echo: seq=2 ttl=30 time=39.86 ms > 64 bytes from dtn://vm2/echo: seq=3 ttl=30 time=43.78 ms > 64 bytes from dtn://vm2/echo: seq=4 ttl=30 time=34.04 ms > 64 bytes from dtn://vm2/echo: seq=5 ttl=30 time=40.22 ms > > and they work fine. > Nevertheless, when i try to use UDP convergence layer by setting > ibrdtnd.conf on both computers: > > net_interfaces = lan0 > > net_lan0_type = udp > net_lan0_interface = eth0 > net_lan0_port = 4556 > > ping does not work(neither dtnsend)! Ibrdtn daemon does not show any > errors(see below). In wireshark i can only see Discovery packets. > Moreover i can see that both nodes can see each other (by using ibrdtn > api neighbor list command). > > Wed Dec 16 15:31:16 2015 INFO NativeDaemon: IBR-DTN daemon 1.0.1 > (build > 294b543) > Wed Dec 16 15:31:16 2015 INFO Configuration: Configuration: > /etc/ibrdtn/ibrdtnd.conf > Wed Dec 16 15:31:16 2015 INFO NativeDaemon: use logfile for output: > /var/log/ibrdtn/ibrdtn.log > Wed Dec 16 15:31:16 2015 INFO NativeDaemon: Parallel event processing > enabled using 4 processes. > Wed Dec 16 15:31:16 2015 INFO BundleCore: Local node name: dtn://vm1 > Wed > Dec 16 15:31:16 2015 INFO BundleCore: Forwarding of bundles enabled. > Wed > Dec 16 15:31:16 2015 INFO NativeDaemon: using bundle storage in > memory-only mode > Wed Dec 16 15:31:16 2015 INFO NativeDaemon: API initialized using tcp > socket: loopback:4550 > Wed Dec 16 15:31:16 2015 INFO NativeDaemon: UDP ConvergenceLayer added > on > eth0:4556 > Wed Dec 16 15:31:16 2015 INFO DiscoveryAgent: listen to > [224.0.0.142]:4551 > Wed Dec 16 15:31:16 2015 INFO DiscoveryAgent: listen to > [ff02::142]:4551 > Wed Dec 16 15:31:16 2015 INFO DiscoveryAgent: add interface eth0 > Wed Dec 16 15:31:16 2015 INFO NativeDaemon: Using flooding routing > extensions > Wed Dec 16 15:31:16 2015 INFO FloodRoutingExtension: Initializing > flooding > routing module > > ibrdtn log looks the same on the second computer (except of course > local node name:) > > Ubuntu instalation were made just before testing IBRDTN (ports are > open, IPTABLES do not block anything, time on each computer differs by > only 2 seconds) > > I would be very grateful if you could provide me with any hints or > maybe someone experienced this issue and already know the solution for > this problem. > > Best Regards > Michał