First, we did not get any errors while installing IBR-DTN. Then, we created the wi-fi channel on both devices and pinged (normal ping command) the wireless interfaces and this worked, they were communicating both ways. We then launched the daemon on these wireless interfaces (following the tutorial: https://trac.ibr.cs.tu-bs.de/project-cm-2012-ibrdtn/wiki/ibr-dtn-tut) but we got the same error on both devices:

root@VeniamWorks666:~# dtnd -i wlan2
Thu Jan  1 01:27:36 1970 INFO Configuration: Using default settings. Call with --help for options.
Thu Jan  1 01:27:36 1970 INFO NativeDaemon: IBR-DTN daemon 0.10.2 (build 1d89427)
Thu Jan  1 01:27:36 1970 INFO Configuration: Using default settings. Call with --help for options.
Thu Jan  1 01:27:36 1970 INFO BundleCore: Local node name: dtn://VeniamWorks666
Thu Jan  1 01:27:36 1970 INFO BundleCore: Forwarding of bundles enabled.
Thu Jan  1 01:27:36 1970 INFO NativeDaemon: using bundle storage in memory-only mode
Thu Jan  1 01:27:36 1970 WARNING DTNTPWorker: The local clock seems to be wrong. Expiration disabled.
Thu Jan  1 01:27:36 1970 INFO NativeDaemon: API initialized using tcp socket: loopback:4550
Thu Jan  1 01:27:36 1970 INFO NativeDaemon: TCP ConvergenceLayer added on wlan2:4556
Thu Jan  1 01:27:36 1970 INFO DiscoveryAgent: listen to [ff02::142]:4551
Thu Jan  1 01:27:36 1970 INFO DiscoveryAgent: listen to [224.0.0.142]:4551
Thu Jan  1 01:27:36 1970 INFO DiscoveryAgent: add interface wlan2
Thu Jan  1 01:27:36 1970 ERROR TCPConvergenceLayer: bind failed (Die addr_len war  falsch  oder  der  Socket  gehrte  nicht  zur AF_UNIX Familie.)
Thu Jan  1 01:27:36 1970 ERROR IPNDAgent: Die addr_len war  falsch  oder  der  Socket  gehrte  nicht  zur AF_UNIX Familie.
Thu Jan  1 01:27:36 1970 INFO NativeDaemon: Using default routing extens

When we tried running the daemon with no interface specified we did not get this error (although we did not succeed in "dtnpinging" either). With interface eth0 there was no error, and with interface br-lan we get got the same error as above. But we must use interface wlan2 for our work, since it is connected to the wireless techonology we want to use. We are including some more details bellow about the interfaces.

Can you help us please?

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root@VeniamWorks666:~# ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br-lan state UP qlen 1000
    link/ether d4:ca:6d:ae:c7:10 brd ff:ff:ff:ff:ff:ff
3: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether d4:ca:6d:ae:c7:10 brd ff:ff:ff:ff:ff:ff
    inet 192.168.6.66/24 brd 192.168.6.255 scope global br-lan
    inet6 2001:690:2380:7770:d6ca:6dff:feae:c710/64 scope global dynamic
       valid_lft 2584321sec preferred_lft 597121sec
    inet6 fdce:a4d:96d9::1/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::d6ca:6dff:feae:c710/64 scope link
       valid_lft forever preferred_lft forever
8: wlan1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UNKNOWN qlen 1000
    link/ether 30:14:4a:e9:fb:8b brd ff:ff:ff:ff:ff:ff
    inet6 fe80::3214:4aff:fee9:fb8b/64 scope link
       valid_lft forever preferred_lft forever
9: wlan2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UNKNOWN qlen 1000
    link/ether 30:14:4a:e9:fb:8b brd ff:ff:ff:ff:ff:ff
    inet 20.0.6.66/24 brd 20.0.255.255 scope global wlan2
    inet6 fe80::3214:4aff:fee9:fb8b/64 scope link
       valid_lft forever preferred_lft forever
10: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 32
    link/ether d4:ca:6d:ae:c7:11 brd ff:ff:ff:ff:ff:ff
    inet 40.0.6.66/24 brd 40.0.255.255 scope global wlan0
100: 3g-3G: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN qlen 3
    link/ppp



root@VeniamWorks666:~# ifconfig
br-lan    Link encap:Ethernet  HWaddr D4:CA:6D:AE:C7:10 
          inet addr:192.168.6.66  Bcast:192.168.6.255  Mask:255.255.255.0
          inet6 addr: fe80::d6ca:6dff:feae:c710/64 Scope:Link
          inet6 addr: 2001:690:2380:7770:d6ca:6dff:feae:c710/64 Scope:Global
          inet6 addr: fdce:a4d:96d9::1/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:307359 errors:0 dropped:789 overruns:0 frame:0
          TX packets:1447 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:41996927 (40.0 MiB)  TX bytes:197944 (193.3 KiB)

eth0      Link encap:Ethernet  HWaddr D4:CA:6D:AE:C7:10 
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:308310 errors:0 dropped:271 overruns:9 frame:0
          TX packets:1458 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:46390072 (44.2 MiB)  TX bytes:198538 (193.8 KiB)
          Interrupt:4

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:448 (448.0 B)  TX bytes:448 (448.0 B)

wlan0     Link encap:Ethernet  HWaddr D4:CA:6D:AE:C7:11 
          inet addr:40.0.6.66  Bcast:40.0.255.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan1     Link encap:Ethernet  HWaddr 30:14:4A:E9:FB:8B 
          inet6 addr: fe80::3214:4aff:fee9:fb8b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:832 (832.0 B)

wlan2     Link encap:Ethernet  HWaddr 30:14:4A:E9:FB:8B 
          inet addr:20.0.6.66  Bcast:20.0.255.255  Mask:255.255.255.0
          inet6 addr: fe80::3214:4aff:fee9:fb8b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:45 errors:0 dropped:0 overruns:0 frame:0
          TX packets:76 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3642 (3.5 KiB)  TX bytes:7168 (7.0 KiB)