Rich C Rich C - 5 months ago 31x
Python Question

Scapy installation fails on osx with dnet import error

Having trouble installing Scapy and it's required dependancies. I have spent some time Googling for a solution but all 'solutions' seem to affect older versions of Python, or simply do not work.



import threading
import Queue
import time
from scapy.all import *

class WorkerThread(threading.Thread) :

def __init__(self, queue, tid) :
self.queue = queue
self.tid = tid
print 'Worker: %d' %self.tid

def run(self) :
total_ports = 0
while True :
port = 0
try :
port = self.queue.get(timeout=1)
except Queue.Empty :
print 'Worker %d exiting. %d ports scanned' %(self.tid, total_ports)


#Scanning begins

ip = sys.argv[1]
response = sr1(IP(dst=ip)/TCP(dport=port, flags='S'), verbose=False, timeout=.2)

if response :
if response[TCP].flags == 18 :

print 'ThreadID: %d: Got port no. %d status: OPEN' %(self.tid, port)
total_ports += 1

queue = Queue.Queue()

threads = []
for i in range(1, 10) :
print 'Creating WorkerThread : %d' %i
worker = WorkerThread(queue, i)
print 'WorkerThread %d created' %i

for j in range(1, 100) :


for item in threads :

print 'Scanning complete'

Python version is 2.7.5 and path to Python verified.

which python

When script is executed I am getting the following error:

Traceback (most recent call last):
File "./", line 6, in <module>
from scapy.all import *
File "/Library/Python/2.7/site-packages/scapy/", line 16, in <module>
from arch import *
File "/Library/Python/2.7/site-packages/scapy/arch/", line 75, in <module>
from bsd import *
File "/Library/Python/2.7/site-packages/scapy/arch/", line 12, in <module>
from unix import *
File "/Library/Python/2.7/site-packages/scapy/arch/", line 20, in <module>
from pcapdnet import *
File "/Library/Python/2.7/site-packages/scapy/arch/", line 160, in <module>
import dnet
ImportError: No module named dnet

I can use both the Scapy and Python interactive interpreters and running
import scapy
in the Python interpreter produces no errors.
When the script was run initially the
module was missing, however I installed that
and then the issue switched to dnet, which I cannot find a solution for.
A similar post, seems to describe the same issue but the workarounds have no effect.
Can anybody shed any more light on this issue?

Commands used to install pcapy and libdnet:

libdnet-1.11.tar.gz (01-19-2005)

` ~/Downloads/libdnet-1.11 
chmod a+x configure
~/Downloads/libdnet-1.11 
./configure && make`

Exits successfully

Pcapy: Latest stable release (0.10.8), updated August 26, 2010

~/Downloads/pcapy-0.10.8 

sudo python install
running install
running build
running build_ext
running build_scripts
running install_lib
running install_scripts
changing mode of /usr/local/bin/96pings.pcap to 777
changing mode of /usr/local/bin/ to 777
running install_data
running install_egg_info
Removing /Library/Python/2.7/site-packages/pcapy-0.10.8-py2.7.egg-info
Writing /Library/Python/2.7/site-packages/pcapy-0.10.8-py2.7.egg-info
~/Downloads/pcapy-0.10.8 

Results for compiling with new flags

~/Downloads/libdnet-1.12 
sudo CFLAGS='-arch i386 -arch x86_64' ./configure --prefix=/usr and archargs='-arch i386 -arch x86_64' make
configure: WARNING: you should use --build, --host, --target
configure: WARNING: you should use --build, --host, --target
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
/Users/richardcurteis/Downloads/libdnet-1.12/config/missing: Unknown `--is-lightweight' option
Try `/Users/richardcurteis/Downloads/libdnet-1.12/config/missing --help' for more information
configure: WARNING: 'missing' script is too old or missing
checking for a thread-safe mkdir -p... config/install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking build system type... Invalid configuration `and': machine `and' not recognized
configure: error: /bin/sh config/config.sub and failed
~/Downloads/libdnet-1.12 


EDIT - This answer below states that all mentioned issues were fixed, and suggests a much simpler installation method.

You have not completed the installation of libdnet and its Python wrapper, as stated in Scapy's installation guide:

$ wget
$ tar xfz libdnet-1.12.tgz
$ ./configure
$ make
$ sudo make install
$ cd python
$ python2.5 install

If your system is 64 bit, use these compilation commands instead:

$ CFLAGS='-arch i386 -arch x86_64' ./configure
$ archargs='-arch i386 -arch x86_64' make

Moreover, please verify that you've installed the correct version, i.e. 1.12 rather than 1.11.

If that fails as well, try installing via macports and use its file, as described here:

$ port selfupdate
$ port upgrade outdated
$ port install py27-libdnet
$ port install libdnet 
$ cp /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/ /Library/Python/2.7/site-packages

That link also recommends changing some code in /Library/Python/2.7/site-packages/scapy/arch/ (fix OSError: Device not configured).

Change line 34 from:

f=os.popen("netstat -rn") # -f inet


f=os.popen("netstat -rn | grep -v vboxnet") # -f inet

as follows:

def read_routes():
    if scapy.arch.SOLARIS:
#       f=os.popen("netstat -rvn") # -f inet
        f=os.popen("netstat -rn | grep -v vboxnet") # -f inet

If you still get the error OSError: Device not configured, then try performing similar changes to the other branches of the if clause (specifically, to its else branch), as described in this answer.