Ntopng Command Line

How to install Ntopng Network Monitor on Debian 10 Ntopng is a free, open-source and very useful network monitoring tool that can be used to monitor network traffic in real-time. It's all Git and Ruby underneath, so hack away with the knowledge that you can easily revert your modifications and merge upstream updates. Options in the configuration file must be reported one per line. export/import and/or use of strong cryptography software, providing cryptography hooks or even just communicating technical details about cryptography software is illegal in some parts of the world. To blink the light on a hard disk on Dell Server from the command line first get a list of the physical disks so you can check the disk ID: omreport storage pdisk controller=0 then to blink the disk: omconfig storage pdisk action=blink. nProbe and ntopng. Step 3: Reboot. Port details: ntopng Network monitoring tool with command line and web interfaces 3. Continue by pressing ENTER. Type the following command as root user to shutdown server immediately without any warning to the users:. ctl This is the remote control socket. March 20, 2013 jonny linux, network, ubuntu. You will need to remove this service and create one that meets your needs. For example, if the command line is "ntopng s. Bridging is popular, and so it has reference material in several places that may not all be updated at once. You may have probs if your machine is a double boot machine with this commercial system from redmond because then you have two systems which try to change the daylight savings in Bios. Port on which ntopng will listen for the web-UI - default port 3000. cryptography disclaimer. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. ntopng is the next generation of ntop and the tool provides a graphical user interface via the browser for network monitoring. I installed this on an ubuntu server. Hi there!, In the following weeks, I’ll be using the Floodlight controller to develop some code to get a deeper understanding on Software-Defined Networks. IPFire uses a firewall using Stateful Packet Inspection (SPI) which is built on top of netfilter, the Linux packet filtering framework. In the modern era, in spite of the ability to transmit graphical user interfaces over the Internet, the command line remains a powerful tool for performing certain types of tasks. Create a bridge interface from command line. Eine Option ist das Menü (Aufruf im Executive-Mode via #menu). ! • Idle flows are periodically purged in order to free memory. We’re going to install the community version to monitor the resources on a new VPS server we created. ntopng Section Command Line Options of this guide thoroughly discuss any available option. , Wiki Web Site Traffic). NetFlow Configuration Into DISTRIBUTED Switch IN Vcenter server 6 5. Thanks to these extensions you can easily turn your Core installation to a custom appliance such as network host, router, switch, server. Ntop does not provide a user friendly user web interface, but you use it to monitor CPU, Memory & Disk Usage and services from the command line terminal. Tcpdump works by capturing and displaying packet headers and matching them against a set of criteria. ntopng is an open-source (GPLv3) network traffic analyzer which provides a web interface for real-time network traffic monitoring. In order to interact with ntopng from the command line, fire up a Windows Commands Promt and navigate to the ntopng installation directory. You can use these interfaces to generate graphs and charts of your network data. 04 LTS 64 bit server edition. Note that you might be prompted for admin rights. Software Packages in "buster", Subsection doc 4ti2-doc (1. jpeg -sampling-factor 4:2:0 -strip -quality 60 -interlace JPEG -colorspace RGB output-file-60. In this tutorial, we will focus on those that are packaged. 100 version (current is 3. Ntopng is an opensource network traffic monitoring system that provides a web interface for real-time network monitoring. As command line parameters, credentials should be provided and the user. However, the display shows number of flows and number of hosts below the defaults (131,072 flows and 65,536 hosts) I tried to increase the -X and -x parameters but it didn't seem to change anything (these were placed in the STARTUP Parameters for the NTOPNG service) Thanks for any help you can. Tcpdump works by capturing and displaying packet headers and matching them against a set of criteria. 1:6379> ping PONG 127. Ntopng will see it as your local network. #yum install tcpdump In order to run tcpdump you will need to have root or sudo priviliges. 1_14 net =70 5. I already pointed to the many great features of ntopng in the previous post. ntop Usage: Command-Line Options. VERSION 1 Created on: Dec 12 from the command line of the zenoss server as the zenoss user can you do mysql -h remotemysqlserver -u zenoss. Create a bridge interface from command line. Software Packages in "buster", Subsection net 2ping (4. At first when I upgraded everything worked fine and booted normally. • Using command line options, users can specify how many hosts/flows can be kept in memory. Today, networks span globally, having multiple links established between geographically separated data centers, public and private clouds. ntopng behaves as if all of the text had simply been typed directly on the command line. How To Install and Manage Ports on FreeBSD 10. Users may use the web browser to access the current network views that include charts and statistics. 1-1) [universe] Ping utility to determine directional packet loss 3270-common (3. The Ntopng is an open-source network traffic monitoring system that provides a web interface for real-time network monitoring. Provides statistics for CPU time, memory, disk and network usage. When starting ntopng it is possible to modify its behavior by customizing one or more of the several optional settings available, using either the command line, or grouping them in a configuration file. Running ntopng as a service, rather than a foreground or background script requires additional steps. A download link can be found here. ntopng is the newer client to ntop and allows you to monitor your server’s resource usage using a graphical interface, unlike ntop which only provides a command line interface. out >/dev/null Conclusion. Another contradiction is with the manual. Next, enter the following command to install ntopng onto your Linux host. 04 - starts fine from command line. ntopng is an open-source (GPLv3) network traffic analyzer which provides a web interface for real-time network traffic monitoring. Release Notes: ntop was completely rewritten from scratch and renamed as ntopng. Comment lines are accepted as well and. d20190920,1. How to install Ntopng on CentOS 7. apt-get is the command-line tool for handling packages, and may be. It is an open source, high-speed web-based traffic analyzer, and security monitoring software. 0 branch - Don't hardcode /usr/local in configuration script - Greatly simplify Makefile. 9+ds-1) mathematical tool suite for problems on linear spaces -- user guide abigail-doc (1. start-stop-daemon start-stop-daemon [option] command DESCRIPTION start-stop-daemon is used to control the creation and termination of system-level processes. CentOS 8 Package Management with DNF on the Command Line DNF stands for Dandified YUM is a software package manager for RPM-based Linux distributions. I hope this. TestDisk is a free and opensource, command-line data recovery tool that is used to recover data from deleted or lost partitions. La release Open Source di Pfsense® 2. This Configuration Guide shows how to enable IPFIX using Java Device Manager (JDM) or with the Command Line Interface. Blog Webernetz. If the data directory is located somewhere else on your system, specify that location with the --datadir option to mysqld or mysqld_safe, on the command line or in an option file. txt try changing the fbcon=map: option to 1 instead of whatever it’s set to. How to erase ntopng 1. How to start, stop, and restart services in Linux by Jack Wallen in Open Source on March 15, 2017, 10:27 AM PST Controlling services in Linux doesn't have to be a confounding experience. Three ways to Send Email from Ubuntu Command Line October 15, 2019; How to install Ntopng Network Monitor on Debian 10 October 15, 2019; How To Create Custom Ubuntu Live CD Image Using Cubic October 15, 2019. To remove the ntopng package and any other dependant package which are no longer needed from Debian Sid. 04 - starts fine from command line Dave Davis dave at davispc. com Wed Aug 3 17:41:08 CEST 2016. conf" and file s. Similar to my test with Diffie-Hellman group 14 shown here I tested a VPN connection with elliptic curve Diffie-Hellman groups 19 and 20. d/ folder to restart ntopng. Then uncomment the sections for [manager] , [proxy-1] and [worker-1]. What are the CLI commands to start and stop a service, e. checking the maximum length of command line arguments. Despite their versatility, however, libpcap -based network monitoring tools cannot scale to handle traffic on multi Gigabit rate network interfaces, due to the overhead associated with user-space. 3-0ubuntu1) [universe] debugging symbols for jovie jstest-gtk-dbg (0. How do I control and monitor traffic on our home network? And then you use the technology as a means to help enforce that and remind the kid that he's crossed the line. It very useful tool that helps you learn more about your network traffic. This tutorial guide will show you two easy ways to Backup and Restore MySQL Database Using Command Line – mysqldump. netscape) can attach to ntop (that acts as a web server) and get a dump of the network status. ntop usage from the command-line is fairly simple. 0 branch - Update net/ntopng to new 3. What is NTOPNG? Ntopng is a traffic monitoring tool with a focus on flows and statistics related to any traffic that goes through a server. I've been trying to install NTOP on my pfsense box (Watchguard X750e - running 2. [SOLVED] Re: How to set ntopng to run as a daemon Sun Jul 26, 2015 2:46 am It seems that when you install ntopng, ntopng and redis-servers get added into the start-up process (rc. In this quick how to we will look at monitoring Publicly available SMTP servers with Nagios. You could run the following command as per your Linux/Unix variant. Documentation Feedback. actually you dont worry about this command line interface, maybe you have phobia with command line interface and totally not prever used command line interface to see link connection or your topology network, mininet can integrated with other platform like OpenDaylight to act as remote controller SDN and as web base graphical interface to. This brief tutorial shows students and new users how to use the su command on Ubuntu 18. It very useful tool that helps you learn more about your network traffic. TestDisk is a free and opensource, command-line data recovery tool that is used to recover data from deleted or lost partitions. Comment lines are accepted as well and. It’s syntax is: sudo dd if=/path/to/iso/ of=/dev/sdX. Historically, the command line interface provided a way to manipulate a computer over simple, text-based connections. Linux Today. Value is in minutes. HTTP_PORT = 3000 Additional command - line arguments for ntopng , more : ntopng – help. Note that Ntop isn’t the same software as NtopNG. Instructions on how to install ntopng on Ubuntu 16. Network Monitoring with ntopng under Centos 70 As UNIX old skool what I did not want to find is some old command line tool producing bare bones numeric output. If you use sshpass, the command ssh [email protected] Otherwise, the server will not work properly. d/ folder to restart ntopng. [email protected]:~# vim /etc/ntopng. For those of you who didn’t know, Ntopng is a relatively useful tool if you are looking to monitor different network protocols on your servers. net IT-Security, Networks, IPv6, DNSSEC, NTP, Monitoring, DIY single CLI command while not actually updating any clock but only displaying the result. If you specify options in both the command line and the file, ntopng will prioritize settings in the configuration file. It does include a plug-in for audit event multiplexor to pass audit records to a remote syslog server. I'm probably doing something blatantly stupid here, but for some reason when I read a packet capture file into ntopng (Windows) I get no data displayed in the web interface - I am running ntopng from a command line, redis is running as a service. vipw [-s] vigr [-s] /etc/passwd. Questo significa che tutte le sue nuove features sono ora stabili. Enter 'make' to start building ntopng. tcpdump is a command-line packet sniffing and protocol analyzer tool writtin in C/C++. It's a command line tool that. Restart, Start, Stop MySQL from the Command Line macOS, OSX, Linux September 19, 2018 26 Comments To restart, start or stop MySQL server from the command line, type the following at the shell prompt…. La release Open Source di Pfsense® 2. Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. You could run the following command as per your Linux/Unix variant. Introduction. Software Packages in "disco", Subsection net 2ping (4. In "man ntopng" no reference to switch --community but it is mentioned in the cli options and in issues 1696 say "the --community switch is only available in licensed version" Question: How can i complete changed/active and work with community/free version? thanks in advance. For example, if the command line is "ntopng s. You can do this by running following command: You can do this by running following command:. That tool has been deprecated, in favor of ntopng (aka The Network Time Protocol Reference Implementation, refactored, the Next Generation). The high packets drop could be linked to the high number of flows. Any pointers you have would be greatly appreciated! I can't seem to keep ntopng up and running :(. One of the good things about this tool is that you can use a web browser to manage and navigate through ntop traffic information to better understand network status. Probably the most well-known open source traffic analyzers, Ntop, is a web-based tool that runs on Ubuntu x64 versions, CentOS/Redhat x64 Linux flavors, Windows x64 Operating systems, BeagleBoard ARM, Ubiquity networks EdgeRouter and even Mac OSX per their github site. Using ntopng with nProbe is convenient in several scenarios, including: The visualization of NetFlow/sFlow data originated by routers, switches, and network devices in general. An easy way to get a list of MAC to IP addresses on the local subnet is to ping every host on the subnet and then check you ARP cache, however pinging every individual node would take ages and the entries only stay in the ARP cache for 2 minutes. The latest incarnation of ntop, the GPLv3-licensed "ntopng", depends on a closed-source, commercially licensed component ("nProbe") As ntop is now useless, what are the alternatives? Welcome to the most active Linux Forum on the web. Jack Wallen shows you how to install this open source tool. It will capture packets and display them on the screen or save them to a file. The library can be incorporated into larger digital 689 C. It sports a web interface for accessing accounting data and includes support for popular tools/protocols as well DPI and host categorisation. Questa pagina contiene il riassunto delle innovazioni, aggiunte e migliorie di pfSense® CE 2. If you are a command line newbie, and want to know how you can make such changes through the command line, you'll be glad to know that there exists a command - dubbed chown - that lets you do this. Syntax: The syntax is the rule and format of how the rm command can be used… These syntax options can be. js Repeating the simulated denial of service attack without the controller active and with the controller active shows the same results demonstrated in the previous article:. NST is a bootable, live CD based on Fedora. ntop usage from the command-line is fairly simple. NethServer 6. Use route, netstat -rn and ip route show to view your route table. ntop can be used in both interactive or web mode. "The Ntopng Hosts page has been enhanced for the geolocation of top active traffic flow connections. The older ntop package has been replaced by ntopng. Is there a way to download the latest stable source from SourceForge? an example for ntopng would be very welcome. The auditd service does not include the ability to send audit records to a centralised server for management directly. How to Delete a MySQL Database. conf contains just the line '-s', then the effective command line is "ntopng -s". It sports a web interface for accessing accounting data and includes support for popular tools/protocols as well DPI and host categorisation. Some of the topics include capturing packets with tcpdump, mining DNS resolutions using only command-line tools, and busting obfuscated protocols. All windows may also be typed into directly. Jack Wallen shows you how to install this open source tool. Two other tools that I have not used but look promising are: jnettop. [/important] Speedtest-cli is a simple client written in Python CLI to measure bidirectional bandwidth Internet using the Speedtest. Previous message: [Ntop] ntopng for windows - no data from pcap Next message: [Ntop] won't start on boot in Ubuntu 14. The most basic tools are command-line diagnostic tools. Please add the -v 3 option to your ntopng command line and perform a grep on the output for Purging idle flows. ntop is a network probe that shows network usage in a way similar to what top does for processes. You can use. If you also want to delete configuration and/or data files of ntopng from Ubuntu Xenial then this will work: sudo apt-get purge ntopng. service --status-all shows that both services are running. 10 Free Network Management Tools 1. HTTP_PORT = 3000 Additional command - line arguments for ntopng , more : ntopng - help. It seems like old flows are not being removed from memory in the new version. Bash is the GNU Project's Bourne Again SHell, a complete implementation of the POSIX. How to install Ntopng Network Monitor on Debian 10 (Oct 15, Ntopng is a free, open. Second, each currently installed server that you do not want Razor to re-install must be entered into Razor manually on the command line. In case you use a configuration file, the following options on the command line will be ignored. Options in the configuration file must be reported one per line. 6 Responses to “Nagios Check for Windows Updates”. HowTo/shorewall - Configuring your firewall. 0, Python – ver. 151130 is "C:\Program Files\ntopng\unins000. Ntopng starts when I run '/etc/init. Next, start Ntop in “interfactive” mode. ntopng behaves as if all of the text had simply been typed directly on the command line. Auto Update URL – Per chi aggiorna, prima assicurarsi di aver impostato la URL corretta. usermod -a -G adm,sudo,users username Check content of passwd and group file and do necessary adjustments. py file to a windows machine to convert it to an. ntopng is based on libpcap and it has been written in a portable way in order to virtually run on every Unix platform, Mac OS and on Win32 as well. ! • Idle flows are periodically purged in order to free memory. I installed ntopng on ClearOS 7. 5 server but can't seem to get the http gui to start up automatically after a reboot of the server. 04 - starts fine from command line. I am not comfortable deleting files in Unix. Like the command-line tool with a similar name, ntop is a monitoring agent. The customizations extend to the command line. Network Monitoring with ntopng under Centos 70 As UNIX old skool what I did not want to find is some old command line tool producing bare bones numeric output. Also note that port 3001 needs to opened on a firewall if public access is needed. Introduction. Niko78 opened this issue May 15, 2016 · 12 comments Comments. Software Packages in "jessie", Subsection net 2ping (2. >> ntopng Type "ntopng". All the options are listed in the man page. Manually add a private route. ntopng is an open-source (GPLv3) network traffic analyzer which provides a web interface for real-time network traffic monitoring. - SYN-SENT: Represents waiting for a matching connection request after having sent a connection request. Note: for backwards compatibility the old service command is still available in CentOS 7 and it will redirect any command to the new systemctl utility. Don't use the -d or -daemon command line argument. sudo apt-get remove --auto-remove ntopng Purging ntopng. One of the good things about this tool is that you can use a web browser to manage and navigate through ntop traffic information to better understand network status. nethserver-letsencrypt¶. We normally use Services. > ntopng-data. As you may know already, DNS is the short form of Domain name system, which is used to resolve hostnames into IP addresses and vice versa. I did this because I was having trouble with my computer not booting on 16. This location may be overridden using the -p command-line option. d20190920,1. The configuration and operation command line interface is similar to Cisco's IOS. start-stop-daemon start-stop-daemon [option] command DESCRIPTION start-stop-daemon is used to control the creation and termination of system-level processes. This wikiHow teaches you how to use your computer's command line to delete a MySQL database. When it is finished, you will simply be returned to a command prompt if the build was successful. exe and occupies 3. Both these operating systems have a common ancestor — Unix. If you’re familiar with the Unix command ntop, ntopng is the next-generation GUI version of this ageless tool. Anyway, the real power is in the large number of modules and options for basic command line programs, that often is not covered by frontends. /var/run/softflowd. Below are the steps tested on Ubuntu 8. It does include a plug-in for audit event multiplexor to pass audit records to a remote syslog server. TestDisk is a free and opensource, command-line data recovery tool that is used to recover data from deleted or lost partitions. For those of you who didn't know, Ntopng is a relatively useful tool if you are looking to monitor different network protocols on your servers. It seems like old flows are not being removed from memory in the new version. The following commands were run as root. Use route, netstat -rn and ip route show to view your route table. So this is a step-by-step tutorial on how to install ntopng on a Ubuntu server with at least two NICs. We normally use Services. Users may use the web browser to access the current network views that include charts and statistics. checking the maximum length of command line arguments. configuration. Watching the status of an Elasticsearch cluster; Watching event data; Troubleshooting; Limitations; Command line tools. ntopng is the next generation version of the original ntop, a network traffic probe that shows the network usage, similar to what the popular top Unix command does. Below are. I tried "service avahi restart" in the Shell but got an "avahi does not exists …". ClusterSSH is a tool for making the same change on multiple servers at the same time. Network Monitoring With ntop. I would remove the cert file as a test and then try and start it with just something like this : ntopng --http-port 8080 and see if it binds to that port (or whatever port you used). apt-get install is followed by one or more packages desired for installation or upgrading. First, the obligatory apt-get command to install the program: # apt-get install ntop. As mentioned above, a configuration file can be used in order to start ntopng. Software Packages in "bionic", Subsection net 2ping (4. It is a high-performance, low-resource and next generation version of the original ntop based on libpcap. Basically the new ntopng removed the ability to disable alerts via the command line, so if you had that option checked in the ntop settings, it would cause everything else to act up. The full command line should be:. sFlow Toolkit operates through a command line. Jason February 10th, 2014. curl: 8 Command Line Examples curl is a great addition to any scripter's arsenal and I tend to use it quite a lot - so I thought I would demonstrate some of its features in this post. There exists a sea of Linux command line tools, allowing you to do almost everything you can think of doing on your Linux PC. Hi Alfredo, If you notice the command line I included in my Email I have the -H flag included. Its unique features make it possible to dig out information in even the most obscure file formats. It's a command line tool that. Instructions on how to install ntopng on Ubuntu 16. Clone via HTTPS Clone with Git or checkout with SVN using the repository’s web address. 2 (r8775) version 1. Documentation Feedback. 04 LTS are covered in this tutorial. alii85 at gmail. 1_14 net =70 5. 3-0ubuntu5) [universe] Sophisticated CD/DVD burning application - debugging symbols. Chemistry boffins at the University of Hawaii have found, rather disturbingly, that different computer operating systems running a particular set of Python scripts used for their research can produce different results when running the same code. Uninstall ntopng-data. It's a stripped down version of Linux specifically designed for embedded devices. You can do this by running following command: You can do this by running following command:. Any way I can make sure that ntopng starts after MySQL?. I tried "service avahi restart" in the Shell but got an "avahi does not exists …". Here is a curated list of Top 43 network monitoring tools for. For assistance in solving software problems, please post your question on the Netgate Forum. jpeg -sampling-factor 4:2:0 -strip -quality 60 -interlace JPEG -colorspace RGB output-file-60. The pfSense project is a free, open source tailored version of FreeBSD for use as a firewall and router with an easy-to-use web interface. How to install Ntopng Network Monitor on Debian 10 Ntopng is a free, open-source and very useful network monitoring tool that can be used to monitor network traffic in real-time. I did this because I was having trouble with my computer not booting on 16. It is sorting now, and I am sure it will work, but how can I do this from command line, with tshark and other linux commands for two reasons: 1) because of the file size, wireshark is taking a,long time to do it, if it does it in the end, a 2) because I need to automate the process of inferring the DDoS attack from the original dataset. , ntopng, iftop) are powered by libpcap, which is a packet capture library used to monitor network traffic in user space. Ntopng is a passive network monitoring tool focused on flows and statistics that can be obtained from the traffic captured by the server. Use NetFlow Probes: NetFlow is a Cisco technology that has been adopted by the industry. A blog about cloud, virtualization, sdn and centos. As mentioned above, a configuration file can be used in order to start ntopng. ctl This is the remote control socket. When ntopng is used as service, command line options need to be specified at service registration and can be modified only by removing and re-adding the service. Create a configuration file for ntopng using the example below. 0 branch - Don't hardcode /usr/local in configuration script - Greatly simplify Makefile. The ‘cssh’ command opens an xterm to all specified hosts and an administration console. UNIX has no problems with daylight savings. In "man ntopng" no reference to switch --community but it is mentioned in the cli options and in issues 1696 say "the --community switch is only available in licensed version" Question: How can i complete changed/active and work with community/free version? thanks in advance. For several years in the mid 2000s I was the Release Manager and a contributor to nTop, a network analysis and monitoring tool. Add existing user to additional groups. A download link can be found here. Linux stop command help and information with stop examples, syntax, related commands, and how to use the stop command from the command line. How to start, stop, and restart services in Linux by Jack Wallen in Open Source on March 15, 2017, 10:27 AM PST Controlling services in Linux doesn't have to be a confounding experience. # # Notice option "include" won't be rewritten by command "CONFIG REWRITE" # from admin or Redis Sentinel. NetFlow is an industry standard for flow-based traffic monitoring. > ntopng-data. "The Ntopng Hosts page has been enhanced for the geolocation of top active traffic flow connections. However I am noticing now that the Username and Password boxes are changing to Red after a few seconds. This guide shows how to display the date and time in various formats using the Linux command line. Ntopng can be run either as service or as application (i. 6ga4-3) [universe] Common files for IBM 3270 emulators and pr3287. For those of you who didn’t know, Ntopng is a relatively useful tool if you are looking to monitor different network protocols on your servers. 1 ip-10-0-11-227. This guide here (with nProbe) is only needed if ntopng is NOT running on the same machine. ! • Hosts are serialised and stored in JSON format in Redis for 1 hour, so that in case new traffic is detected ntopng can restore them from cache. This guide shows how to display the date and time in various formats using the Linux command line. If you specify options in both the command line and the file, ntopng will prioritize settings in the configuration file. com Tue Sep 8 15:21:16 CEST 2015. Below are commands for controlling the operation of a service. I'm attempting to use tshark to get statistics on a live TCP connection. You can use. ntopng is the next generation of ntop and the tool provides a graphical user interface via the browser for network monitoring. My problem is doing this using the curl command. Â This also means that any common means of starting ntop as service such as with `/etc/init. ntopng comes with a simple RMON-like agent with built-in web server capability, and uses Redis-backed key. Also, you can connect to user's mailbox from command line via IMAP protocol, as shown in the below excerpt. 04 LTS… If you're a student or new user looking for a Linux system to start learning on, the easiest place to start is Ubuntu Linux OS…. The program's main executable file is titled ntopng. The VM will start to build ntopng and may take a few minutes depending on the speed of the CPU and how busy the ESX host is. usermod -a -G adm,sudo,users username Check content of passwd and group file and do necessary adjustments. conf contains just the line '-s', then the effective command line is "ntopng -s".