Re: [ibr-dtn] UDP Convergence Layer problem (TCP works fine) + partially solved

Hi Michał,

as far as I know, if you want to use it in a system without IPv6, you have to add a static neighbor in your config file right now. Data transmission works in IPv4, it's just the discovery which is IPv6-only at the moment.

If I'll find a bit time, I will try to create a patch which allows to configure the type.

Best regards, Stephan

Am Donnerstag, den 17.12.2015, 11:56 +0100 schrieb mazur221:

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