digliano
> Gesendet: Freitag, 13. Dezember 2019 15:01
> An: ntop-misc@listgateway.unipi.it
> Betreff: Re: [Ntop-misc] n2disk: 100Gbps?
>
> Hi Marcel
> there are a few options, for n2disk we recommend Napatech or Fiberblaze as
> they support native bulk PCAP mode.
> As of the st
ntop-misc@listgateway.unipi.it
Betreff: Re: [Ntop-misc] n2disk: 100Gbps?
Hi Marcel
there are a few options, for n2disk we recommend Napatech or Fiberblaze as they
support native bulk PCAP mode.
As of the storage, you can use n2disk to write to multiple NVMe disks in
parallel (I do not have a specifi
>
> -Ursprüngliche Nachricht-
> Von: ntop-misc-boun...@listgateway.unipi.it
> Im Auftrag von Alfredo Cardigliano
> Gesendet: Freitag, 13. Dezember 2019 14:40
> An: ntop-misc@listgateway.unipi.it
> Betreff: Re: [Ntop-misc] n2disk: 100Gbps?
>
> Hi Marcel
> fm10k
@listgateway.unipi.it
Betreff: Re: [Ntop-misc] n2disk: 100Gbps?
Hi Marcel
fm10k-based adapters support 100G connectivity, however they are not optimized
to handle full 100Gbps.
Please consider using FPGA adapters if you want to record 100Gbps to disk (and
a good NVMe disks array).
Regards
Alfredo
> On 13
Hi Marcel
fm10k-based adapters support 100G connectivity, however
they are not optimized to handle full 100Gbps.
Please consider using FPGA adapters if you want to record
100Gbps to disk (and a good NVMe disks array).
Regards
Alfredo
> On 13 Dec 2019, at 14:22, Lüthi Marcel FUB wrote:
>
> Hi.
Hi.
We acquired a "Silicom PE3100G2DQIR-QX4 V:1.4" which is based on Intel FM10420.
As described in the PF_RING guide
(https://www.ntop.org/guides/pf_ring/zc.html#supported-cards), FM10420 is
supported.
Therefore, can we assume that 100Gbps can be recorded with n2disk? (a
corresponding hardware
95'033.90 pps/9.54 Gbps][average 14'003'836.88 pps/9.41
Gbps][total 112'033'972.00 pkts]
TX rate: [current 14'182'567.94 pps/9.53 Gbps][average 14'017'274.59 pps/9.42
Gbps][total 121'258'144.00 pkts]
Sent 121258144 packets
[root@myhost]#
Von:
; Family: Standard NIC
> # Bound Sockets: 1
> TX Queues:32
> RX Queues:32
>
>
> Regards,
> Marcel
>
>
>
> Von: ntop-misc-boun...@listgateway.unipi.it
> [mailto:ntop-misc-boun...@listgateway.unipi.it] Im Auftrag von Alfredo
> Cardigliano
&g
...@listgateway.unipi.it] Im Auftrag von Alfredo
Cardigliano
Gesendet: Donnerstag, 18. Mai 2017 10:01
An: ntop-misc@listgateway.unipi.it
Betreff: Re: [Ntop-misc] n2disk/disk2n: Problem with PF_RING ZC
Hi Marcel
please provide “cat /proc/net/pf_ring/dev/eno1/info”
Alfredo
Hi Marcel
please provide “cat /proc/net/pf_ring/dev/eno1/info”
Alfredo
> On 17 May 2017, at 16:17, Lüthi Marcel FUB wrote:
>
> Hello.
>
> I want to maximize the performance for n2disk/disk2n and use PF_RING ZC.
> PF_RING only is working as expected, but this doesn't:
>
> [root@myhost]# pfcoun
...@listgateway.unipi.it]
Gesendet: Mittwoch, 17. Mai 2017 16:18
An: ntop-misc@listgateway.unipi.it
Betreff: [Ntop-misc] n2disk/disk2n: Problem with PF_RING ZC
Hello.
I want to maximize the performance for n2disk/disk2n and use PF_RING ZC.
PF_RING only is working as expected, but this doesn't:
Hello.
I want to maximize the performance for n2disk/disk2n and use PF_RING ZC.
PF_RING only is working as expected, but this doesn't:
[root@myhost]# pfcount -i zc:eno1
pfring_open error [No such device] (pf_ring not loaded or interface zc:eno1 is
down ?)
[root@myhost]# pfsend -i zc:eno1
Sendin
Thanks Alfredo, all is working as expected now!
From: ntop-misc-boun...@listgateway.unipi.it
on behalf of Alfredo Cardigliano
Sent: Thursday, November 17, 2016 5:49 AM
To: ntop-misc@listgateway.unipi.it
Subject: Re: [Ntop-misc] n2disk dumping with RHEL6
Thanks,
> Derek
> From: ntop-misc-boun...@listgateway.unipi.it
> on behalf of Alfredo Cardigliano
>
> Sent: Tuesday, November 15, 2016 9:01 AM
> To: ntop-misc@listgateway.unipi.it
> Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
> 2.6.32-642.4.2.el6.x86_64
>
this needs to be added for node 1 as well?
Thanks,
Derek
From: ntop-misc-boun...@listgateway.unipi.it
on behalf of Alfredo Cardigliano
Sent: Tuesday, November 15, 2016 9:01 AM
To: ntop-misc@listgateway.unipi.it
Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 K
Hi Derek
this seems to be related to hugepages, could you provide more info about memory
in your system including:
cat /sys/devices/system/node/node*/meminfo | grep Huge
Alfredo
> On 14 Nov 2016, at 15:13, Spransy, Derek wrote:
>
> Hi Alfredo,
>
> Yes the behavior is the same as before:
>
>
pfring_zc_0", O_RDWR|O_CREAT, 0755) = 7
flock(7, LOCK_SH) = 0
mmap(NULL, 134217728, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_LOCKED, 7, 0) =
0x7fb03320
--- SIGBUS {si_signo=SIGBUS, si_code=BUS_ADRERR, si_addr=0x7fb033200018} ---
+++ killed by SIGBUS (core dumped) +++
ardigliano
>
> Sent: Friday, November 11, 2016 11:19 AM
> To: ntop-misc@listgateway.unipi.it
> Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
> 2.6.32-642.4.2.el6.x86_64
>
> Hi Derek
> if you check my output, I am installing latest stable version, which I
i.it<mailto:ntop-misc-boun...@listgateway.unipi.it>
mailto:ntop-misc-boun...@listgateway.unipi.it>>
on behalf of Alfredo Cardigliano
mailto:cardigli...@ntop.org>>
Sent: Friday, November 11, 2016 10:34 AM
To: ntop-misc@listgateway.unipi.it<mailto:ntop-misc@listgateway.unipi.i
> Sent: Friday, November 11, 2016 10:34 AM
> To: ntop-misc@listgateway.unipi.it
> Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
> 2.6.32-642.4.2.el6.x86_64
>
> Hi Derek
> I just installed a Centos6 system and it is working for me:
>
> [root@CentOS_Dev ~]#
ubject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
2.6.32-642.4.2.el6.x86_64
Hi Derek
I just installed a Centos6 system and it is working for me:
[root@CentOS_Dev ~]# cat /etc/centos-release
CentOS release 6.8 (Final)
[root@CentOS_Dev ~]# uname -a
Linux CentOS_Dev 2.6.32-642.6.2.el6.x86_64 #1 S
Hi Derek
I just installed a Centos6 system and it is working for me:
[root@CentOS_Dev ~]# cat /etc/centos-release
CentOS release 6.8 (Final)
[root@CentOS_Dev ~]# uname -a
Linux CentOS_Dev 2.6.32-642.6.2.el6.x86_64 #1 SMP Wed Oct 26 06:52:09 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
[root@CentOS_De
ng before reinstalling
> everything from RPMs (via yum).
>
> Thanks,
> Derek
>
>
> From: ntop-misc-boun...@listgateway.unipi.it
> on behalf of Luca Deri
>
> Sent: Thursday, November 10, 2016 3:33 PM
> To: ntop-misc@listgateway.unipi.it
> Subject: Re: [Ntop-mi
(via yum).
>
> Thanks,
> Derek
>
>
> From: ntop-misc-boun...@listgateway.unipi.it
> on behalf of Luca Deri
>
> Sent: Thursday, November 10, 2016 3:33 PM
> To: ntop-misc@listgateway.unipi.it
> Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
> 2.6
@listgateway.unipi.it
Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
2.6.32-642.4.2.el6.x86_64
Derek
how did you update? Via yum?
Luca
On 10 Nov 2016, at 20:11, Spransy, Derek
mailto:dspr...@emory.edu>> wrote:
Hi Alfredo,
I updated, but now I've run into a different problem. It
m: ntop-misc-boun...@listgateway.unipi.it
> on behalf of Alfredo Cardigliano
>
> Sent: Thursday, November 10, 2016 1:07 PM
> To: ntop-misc@listgateway.unipi.it
> Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
> 2.6.32-642.4.2.el6.x86_64
>
> Hi Derek
> I tought
nipi.it
Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
2.6.32-642.4.2.el6.x86_64
Hi Derek
I tought I updated you on this, but it seems it is not the case,
could you try using -R with latest release?
Best Regards
Alfredo
On 3 Nov 2016, at 18:53, Alfredo Cardigliano
mailto:cardi
redo
>> Cardigliano mailto:cardigli...@ntop.org>>
>> Sent: Thursday, November 3, 2016 1:48 PM
>> To: ntop-misc@listgateway.unipi.it <mailto:ntop-misc@listgateway.unipi.it>
>> Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
>> 2.6.32-642.4.2
; an issue with my config issue or a bug?
>
> Thanks,
> Derek
>
> From: ntop-misc-boun...@listgateway.unipi.it
> on behalf of Alfredo Cardigliano
>
> Sent: Thursday, November 3, 2016 1:48 PM
> To: ntop-misc@listgateway.unipi.it
> Subject: Re: [Ntop-misc] n2disk dumpin
1:48 PM
To: ntop-misc@listgateway.unipi.it
Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
2.6.32-642.4.2.el6.x86_64
Derek
please try running n2disk without "-R 8,9,10"
Alfredo
On 3 Nov 2016, at 18:27, Spransy, Derek
mailto:dspr...@emory.edu>> wrote:
Sure, here&#x
Derek
please try running n2disk without "-R 8,9,10”
Alfredo
> On 3 Nov 2016, at 18:27, Spransy, Derek wrote:
>
> Sure, here's the config:
>
> -i zc:eth5
> -o /data1/captures
> -b 3072
> -p 1024
> -q 1
> -S 0
> -c 6
> -R 8,9,10
> -w 7
> -z 12
> -I
> -A /data1/index
> --max-num-files 43000
> -P=
ntop-misc-boun...@listgateway.unipi.it
on behalf of Alfredo Cardigliano
Sent: Thursday, November 3, 2016 12:07 PM
To: ntop-misc@listgateway.unipi.it
Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
2.6.32-642.4.2.el6.x86_64
Please provide the n2disk configuration and the output of n
% dropped]
> [2'608'527 pkts rcvd][2'406'777'320 bytes rcvd][869'438.57 pkt/sec][6'417.55
> Mbit/sec]
> =====
> Actual Stats: [680'842 pkts rcvd][1'000.06 ms][680'796.38 pps][5.02 Gbps]
> =
>
>
[2'406'777'320 bytes rcvd][869'438.57 pkt/sec][6'417.55
Mbit/sec]
=
Actual Stats: [680'842 pkts rcvd][1'000.06 ms][680'796.38 pps][5.02 Gbps]
=
________
From: ntop-misc-boun...@listgateway.un
0C:34
> Polling Mode: NAPI/ZC
> Type: Ethernet
> Family:Intel ixgbe 82599
> Max # TX Queues: 1
> # Used RX Queues: 1
> Num RX Slots: 32768
> Num TX Slots: 32768
>
> Thanks,
> Derek
>
>
>
> From: ntop-misc-boun...@
,
Derek
From: ntop-misc-boun...@listgateway.unipi.it
on behalf of Alfredo Cardigliano
Sent: Wednesday, November 2, 2016 6:40 PM
To: ntop-misc@listgateway.unipi.it
Subject: Re: [Ntop-misc] n2disk dumping with RHEL6 Kernel
2.6.32-642.4.2.el6.x86_64
Hi Derek
could
Hi Derek
could you double check that all the .ko modules (drivers and pf_ring kernel
module) have been reinstalled by DKMS and reloaded?
Alternatively, any chance to get ssh access to the machine?
Alfredo
> On 2 Nov 2016, at 21:18, Spransy, Derek wrote:
>
> Hello,
>
> Today we upgraded our RH
Hello,
Today we upgraded our RHEL6 n2disk box to kernel 2.6.32-642.4.2.el6.x86_64
(addresses the dirty cow vulnerability). After the upgrade n2disk is dumping. I
went ahead and upgraded n2disk (2.6.161102) and pfring (6.4.1-960) to their
latest available stable versions and ran into the same i
Yes, that is correct.
On Fri, Apr 8, 2016 at 6:31 AM, Alfredo Cardigliano
wrote:
> Hi Jeremy
> in essence at the moment it creates the structure below, but you want the
> file numeration to continue on the next dir instead of restarting from 1,
> did I understand correctly?
>
> /pcaps/1/1.pcap
>
Hi Jeremy
in essence at the moment it creates the structure below, but you want the file
numeration to continue on the next dir instead of restarting from 1, did I
understand correctly?
/pcaps/1/1.pcap
/pcaps/1/2.pcap
…
/pcaps/1/1000.pcap
/pcaps/2/1.pcap
/pcaps/2/2.pcap
…
/pcaps/2/1000.pcap
…
A
To clarify, I am looking for:
/pcaps/1/file-1.pcap
/pcaps/1/file-2.pcap
…
/pcaps/1/file-1000.pcap
/pcaps/2/file-1001.pcap
/pcaps/2/file-1002.pcap
…
/pcaps/2/file-2000.pcap
…
Sorry for the double message.
On Thu, Apr 7, 2016 at 3:10 PM, Jeremy Ashton
wrote:
> This does not appear to work. I no
This does not appear to work. I now have an unlimited number of
directories with 1000 files in each. But, the file number is incremented
after each 1000. aka same problem.
On Thu, Apr 7, 2016 at 3:53 AM, Alfredo Cardigliano
wrote:
> Hi Jeremy
> please update to latest version from the dev rep
Hi Jeremy
please update to latest version from the dev repo, you can specify -n -1 to
create unlimited directories, please test it and let as know if it behaves as
expected.
Alfredo
> On 06 Apr 2016, at 15:55, Jeremy Ashton wrote:
>
> Yes, I am currently dealing with the long term retention i
This is something we are working on and will be available soon, stay tuned.
Alfredo
> On 06 Apr 2016, at 16:06, Jeremy Ashton wrote:
>
> I would assume there is no way to enable conditional packet slicing. i.e.
> For example, during large encrypted data transfers, capture the summary
> infor
I would assume there is no way to enable conditional packet slicing. i.e.
For example, during large encrypted data transfers, capture the summary
information but drop the payload itself (scp, https).
On Wed, Apr 6, 2016 at 9:35 AM, Alfredo Cardigliano
wrote:
> Hi Jeremy
>
> > On 05 Apr 2016, at
Yes, I am currently dealing with the long term retention issues by cleaning
up the disk space.
On Wed, Apr 6, 2016 at 9:37 AM, Alfredo Cardigliano
wrote:
> Hi Jeremy
> if I understand correctly you do not want to restart file numaration, this
> means that you have to move old files using an exte
Hi Jeremy
if I understand correctly you do not want to restart file numaration, this
means that you have to move old files using an external script, otherwise the
storage will be full at some point and n2disk will not be able to write new
files anymore.
Correct?
Alfredo
> On 05 Apr 2016, at 20
Hi Jeremy
> On 05 Apr 2016, at 19:43, Jeremy Ashton wrote:
>
> I noticed the following arguments for n2disk but could not find documentation
> on them:
>
> [—packet-slicing|-0] | Slice packet after the
> specified header.
This can be used to save only a portion of the captured pack
I am trying to create a directory structure like the following:
/pcap/0/
/pcap/1/
…
/pcap/n/
Where each sub-directory contains 1,000 files. I would like to do this
without having to restart the file numbering. That way I can have a
-.pcap which will always increment.
Any thoughts as to how I c
I noticed the following arguments for n2disk but could not find
documentation on them:
[—packet-slicing|-0] | Slice packet after the
specified header.
[—fast-filter|-F]| Faster replacement for BPF
ingress packet filter.
[--archive-directory|-O] | Directory w
That did the trick. n2disk Version 2.3.160101 (r4474) installed
perfectly via apt-get and is functional now.
Thanks again.
On Thu, Dec 31, 2015 at 2:15 AM, Luca Deri wrote:
> Hi Mark,
> we have fixed the dependency and a new package is currently being build (it
> will be available within 20 m
Excellent. You and your team are awesome (as usual).
Have a very happy, safe, and prosperous New Year.
Thanks.
On Thu, Dec 31, 2015 at 2:15 AM, Luca Deri wrote:
> Hi Mark,
> we have fixed the dependency and a new package is currently being build (it
> will be available within 20 mins)
>
> Rega
Hi Mark,
we have fixed the dependency and a new package is currently being build (it
will be available within 20 mins)
Regards Luca
> On 31 Dec 2015, at 04:03, Mark Stingley wrote:
>
> I attempted to install n2disk on an AMD64 Debian Jessie system via:
>
> n2disk_2.3.151230-4473_amd64.deb
>
I attempted to install n2disk on an AMD64 Debian Jessie system via:
n2disk_2.3.151230-4473_amd64.deb
Installation failed with the following error:
n2disk depends on libnl1; however:
Package libnl1 is not installed.
Please note that libnl1 is no longer in distribution. The only
packages list
ad PF_RING. Exiting
Thanks.
Ohad
*From:* ntop-misc-boun...@listgateway.unipi.it [mailto:
ntop-misc-boun...@listgateway.unipi.it] *On Behalf Of *Yuri Francalacci
*Sent:* Tuesday, November 10, 2015 5:13 PM
*To:* ntop-misc@listgateway.unipi.it
*Subject:* Re: [Ntop-misc] N2DISK Error
o:ntop-misc-boun...@listgateway.unipi.it>] On Behalf Of Yuri Francalacci
> Sent: Monday, November 09, 2015 7:54 PM
> To: ntop-misc@listgateway.unipi.it <mailto:ntop-misc@listgateway.unipi.it>
> Subject: Re: [Ntop-misc] N2DISK Error
>
> If there is no output the module is not
-boun...@listgateway.unipi.it] *On Behalf Of *Yuri Francalacci
*Sent:* Monday, November 09, 2015 7:54 PM
*To:* ntop-misc@listgateway.unipi.it
*Subject:* Re: [Ntop-misc] N2DISK Error
If there is no output the module is not loaded.
The command you have to run if in the init.d directory is
If there is no output the module is not loaded.
The command you have to run if in the init.d directory is
./pf_ring start
Or even better use the full path as said in the previous mail.
Yuri
###
Yuri Francalacci - y...@ntop.org - http://www.ntop
: [Ntop-misc] N2DISK Error
connect to the system console and run
# lsmod | grep pf_ring
If there is no output, this means that the the pf_ring module is not
loaded, hence you have to run (at least)
# /etc/init.d/pf_ring start
Once loaded the module (re-run the lsmod as above), retry the
connect to the system console and run
# lsmod | grep pf_ring
If there is no output, this means that the the pf_ring module is not loaded,
hence you have to run (at least)
# /etc/init.d/pf_ring start
Once loaded the module (re-run the lsmod as above), retry the n2disk program.
Yuri
We have an Ubuntu machine with Nbox software that includes nprobe, Ntopng,
n2disk stc.
The n2disk used to work for us, but now when starting the n2disk after few
seconds the status is changed to off. When looking in the log file I can
see the following lines:
08/Nov/2015 17:39:49
WARNING: In
Of course, forgot about -i key
Thanks one more time.
Mikhail Четверг, 8 октября 2015, 11:12 +02:00 от Alfredo Cardigliano
:
>
>pfcount -i veth1
>
>>On 08 Oct 2015, at 11:11, Mikhail Sokolov < ins...@mail.ru > wrote:
>>I see.
>>Many thanks.
>>
>>Failed to run pfcount
>>root@parallels-Parallels-
pfcount -i veth1
> On 08 Oct 2015, at 11:11, Mikhail Sokolov wrote:
>
> I see.
> Many thanks.
>
> Failed to run pfcount
> root@parallels-Parallels-Virtual-Platform:~# ip netns exec GEN pfcount veth1
> pfring_open error [No such device] (pf_ring not loaded or interface eth0 is
> down ?)
>
> S
I see.
Many thanks.
Failed to run pfcount
root@parallels-Parallels-Virtual-Platform:~# ip netns exec GEN pfcount veth1
pfring_open error [No such device] (pf_ring not loaded or interface eth0 is
down ?)
Should I do something prior to run it?
Mikhail
>Четверг, 8 октября 2015, 11:03 +02:00 от A
Hi Mikhail
ok I understand, the reason is that n2disk is configured to capture rx
direction only (it is usually *not*
used to capture traffic generated by the host it runs on). If you are using
n2disk just as sample application
to verify packet capture, please use pfcount instead.
Alfredo
> O
Here is a listing of staring n2disk
root@parallels-Parallels-Virtual-Platform:~# ip netns exec NET n2disk -i veth2
-o /tmp/
08/Oct/2015 11:38:10 [n2disk_zc.c:4203] WARNING: Invalid license found for
7114BE24760661D8
08/Oct/2015 11:38:10 [n2disk_zc.c:4204] WARNING: (See /etc/n2disk.license)
[Mi
Hi, Alfredo,
my setup - Ubuntu 12.04 in VM using Parallels Desktop.
I want to simulate point to point link inside one VM with some delay and loss.
Delay and loss are simulated using netem kernel module (tc utility is used to
config it).
There are 3 namespaces in my config GEN, NET and REC.
GEN i
Hi Mikhail
please provide more details about your setup, including topology, pf_ring
configuration, n2disk command.
Thank you
Alfredo
> On 08 Oct 2015, at 10:01, Mikhail Sokolov wrote:
>
> Hi.
> I have some issue with using n2disk in the network namespace environment.
> Here is a config I have
Hi.
I have some issue with using n2disk in the network namespace environment.
Here is a config I have:
#!/bin/bash
# add the namespaces
ip netns add GEN
ip netns add NET
ip netns add REC
# create the veth pair
ip link add veth1 type veth peer name veth2
ip link add veth3 type veth peer name veth4
Check ntop web site for pfring source code. N2disk is not available in source
format.
Regards, Yuri
Sent from my iPhone
> Il giorno 03/ott/2014, alle ore 13:10, "Farah Braiteh (Student)"
> ha scritto:
>
> Hello everyone,
>
>
> I have the latest version of ntopng and nprobe, and I've been t
Hello everyone,
I have the latest version of ntopng and nprobe, and I've been trying to
download n2Disk and pfring as rpm packages from the following link:
http://www.nmon.net/packages/Packages/ ; however, I am not able to activate
such files.
I wonder if someone can send me the source code
Hi Jeffrey
could you provide us .pcap and .idx in order to reproduce the issue?
Alfredo
On Sep 20, 2013, at 7:39 PM, Jeffrey Savoy wrote:
> Hello All
>
> I seem to be having issues returning any results with n2disk
> findPacketsWithIndex searches. The issue appears when I use -f option to
>
Hello All
I seem to be having issues returning any results with n2disk
findPacketsWithIndex searches. The issue appears when I use -f option to match
only certain packets, e.g. -f "port 80". When I run the command with known
port 80 traffic, over a valid time range and verified by manually re
Hello,
I'm a fairly new user to ntop and so far I think it's a great product. I
have a question regarding the N2Disk feature included with the ntop
appliances (nbox, nrecorder, etc.). Is N2Disk available for download, or
does it only come with the purchase of an ntop appliance?
I'd like t
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