[Mini-NDN] mini-ndn RTNETLINK error and ndndump question

[Gaetano Laterza]

Hi all, I'm starting to learn ndn protocol and mini-ndn tool. In particular
I'd like to start mini-ndn with a very simple configuration, here the
content of my conf file:

$ cat simple.conf
[nodes]
a: _
b: _
[links]
a:b delay=10ms

In short, I'd like to observe the exchange of Interest / Data packets using
ndndump.
First of all, I cannot understand an error occurring during links
initialization:

$ sudo minindn simple.conf
Parse of simple.conf done.
*** Creating network
*** Adding controller
*** Adding hosts:
a b
*** Adding switches:

*** Adding links:
(10ms delay) *** Error: RTNETLINK answers: No such file or directory
(10ms delay) *** Error: RTNETLINK answers: No such file or directory
(a, b)
*** Configuring hosts
a b
Setup time: 4
*** Starting controller
c0
*** Starting 0 switches

*** Starting CLI:
mininet>

Any idea about the Error: RTNETINK answers: No such file or directory?
Here my system information:

$ uname -a
Linux machine 4.1.33-nrj-desktop-1rosa-x86_64 #1 SMP PREEMPT Sun Sep 18
20:20:09 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

So, going back to the packets exchange, through xterm I typed on node a:

$ ndnpingserver /a
PING SERVER /a

Always on node a, I ran ndndump:

$ ndndump -i a-eth0

So I ran from node b the command:

$ ndnping /a
PING /a
content from /a: seq=2172173333986410181 time=2.51873 ms
content from /a: seq=2172173333986410182 time=0.411503 ms
content from /a: seq=2172173333986410183 time=0.381647 ms
content from /a: seq=2172173333986410184 time=0.458184 ms
[...]

And on node a I can see:

interest received: seq=2172173333986410181
interest received: seq=2172173333986410182
interest received: seq=2172173333986410183
interest received: seq=2172173333986410184
[...]

But ndndump doesn't show any packet. Why? I also tried with:

$ tcpdump -i a-eth0 -v

But when I stop it, the result is:

0 packets captured
0 packets received by filter
0 packets dropped by kernel

Thank you in advance for your help!
Regards,
Gaetano.
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