Remote Wake-up of the computer (Wake On LAN)

To remotely turn on the computer, you need to have an ATX power supply, a motherboard with Wake On LAN and BIOS enabled, a Wake On LAN network adapter.

When Wake On LAN is supported, the shut down computer powers the AC adapter that is in low power mode and listens to all packets going to its MAC address without answering them. If a Magic Packet comes, the network adapter sends a signal to turn on the power of the computer.

View active network adapters:

ifconfig

You will need the ethtool package, if it is not installed on the system, you must perform the installation:

sudo apt-get install ethtool

Check for WOL support:

sudo ethtool eth0 | grep Wake

The result of the command if the network card is working with WOL and it is enabled:

Supports Wake-on: g
Wake-on: g

The result of the command when WOL is off:

Wake-on:d

Possible result letters (taken from man ethtool information):

p Wake on PHY activity
u Wake on unicast messages
m Wake on multicast messages
b Wake on broadcast messages
a Wake on ARP
g Wake on MagicPacket™
s Enable SecureOn™ password for MagicPacket™
d Disable (wake on nothing). This option clears all previous options.

To turn on WOL:

sudo ethtool -s интерфейс wol g

Turning on the computer:

apt-get install wakeonlan
wakeonlan -p 50000 00:01:02:03:04:05

-p indicates the UDP port number.

On the Internet, there are also many sites and applications for phones that allow you to send a package to a remote computer.

See also:
Using ethtool

Using ethtool

ethtool – a utility for configuring network interfaces in Linux.

You can install ethtool in Ubuntu / Debian using the command:

sudo apt-get install ethtool

Let’s look at the names of network interfaces:

ifconfig -a

Switch to root, as some commands require elevated privileges:

sudo su

Example of viewing eth0 settings:

ethtool eth0

Example of viewing information about the network interface driver:

ethtool -i eth0

Viewing Network Interface Statistics:

ethtool -S eth0

View auto-negotiation settings:

ethtool -a eth0

The LED blinks for 3 seconds on the specified network interface:

ethtool -p eth0 3

Network Interface Test:

ethtool -t eth0 online/offline

View the current and maximum size of TX and RX buffers:

ethtool -g eth0

Manual speed setting of 100 Mb Full Duplex on the specified network interface (the specified parameters will be reset after the system restart):

ethtool -s eth0 speed 100 duplex full

Viewing help about ethtool:

ethtool -h

See also:
Configuring the Network in Linux
Changing TX and RX network interface buffers in Linux
Remote Wake-up of the computer (Wake On LAN)

Installing and using jnettop

jnettop – a utility for viewing traffic statistics in real time, sorted by hosts / ports.

The installation command in Ubuntu/Debian:

sudo apt-get install jnettop

The installation command in CentOS:

sudo yum install jnettop

An example of a simple start:

sudo jnettop

An example of a start with a network interface:

sudo jnettop -i eth0

I’ll describe the possible startup options:
-h (help)
-v (view version)
-c (disable content filtering)
-d (write debugging information to a file)
-f (reading the configuration from the file, if not specified, then the file is searched for ~/.jnettop)
-i (to capture packets from the specified interface)
–local-aggr [none|host|port|host+port] (set local aggregation to the specified value)
–remote-aggr [none|host|port|host+port] (set remote aggregation to the specified value)
-n (do not resolving IP to DNS names)
-p (inclusion of promiscuous mode to receive all packets that come to the network interface)
-s (selects one of the rules defined in the .jnettop configuration file (by its name))
-x (allows you to specify a custom filter rule. this allows you to use the syntax of the tcpdump style. do not forget to include the filter in quotation marks when starting from the shell)

Install and configure ntopng

Below I’ll describe the installation of ntopng in Ubuntu.
We select the necessary package on http://packages.ntop.org/apt-stable/ and download it:

wget wget http://apt-stable.ntop.org/16.04/all/apt-ntop-stable.deb
sudo dpkg -i apt-ntop-stable.deb

Further we carry out:

sudo apt-get clean all
sudo apt-get update
sudo apt-get install pfring nprobe ntopng ntopng-data n2disk nbox
sudo touch /etc/ntopng/ntopng.start
sudo /etc/init.d/ntopng restart

If new versions of ntopng are released, then you can update by running the commands:

sudo apt-get update
sudo apt-get upgrade

After installation, the configuration file will be located in the /etc/ntopng/ntopng.conf directory
I will give an example of its content:

-w=3000
-d=/var/tmp/ntopng
-G=/var/run/ntopng.pid
--httpdocs-dir /usr/share/ntopng/httpdocs
--local-networks="192.168.0.0/16,10.0.0.0/8,172.16.0.0/16"

Restart / stop / start ntopng with commands:

sudo /etc/init.d/ntopng restart
sudo /etc/init.d/ntopng stop
sudo /etc/init.d/ntopng start

You can check from the console with the command:

sudo /etc/init.d/ntopng status
sudo netstat -tulpn | grep :3000

Open the web interface by typing in the address bar of the browser:
http://HOST:3000

The standard login and password are admin/admin.

See also:
Install and configure nprobe
The solution to the error “Missing /etc/ntopng/ntopng.start. Quitting”

Installing and using trafshow

trafshow – a utility for displaying traffic statistics passing through network interfaces.

Since the utility is included in the Netdiag (Net-Diagnostics) set, everything is installed together.

You can install Netdiag and trafshow in Ubuntu / Debian using the following command:

sudo apt-get install netdiag

In CentOS/RedHat/Fedora:

sudo yum install netdiag

Command viewing guide:

man trafshow

Simple launch:

sudo trafshow

I’ll describe the possible startup options:
-v (view the version of the program)
-n (do not convert the addresses into DNS names, and port numbers for example 80 in http, etc., in the running program, you can toggle the option with the N key)
-a len (summarizing traffic flows using the IP prefix IP netmask len, in the program is switched by pressing the A key)
-с conf (using an alternative color configuration instead of the standard / etc / trafshow)
-i name (indication of the network interface)
-s str (search for an item in the list and go to it)
-u port (listening to the specified UDP port for Cisco Netflow, the default number is 9995, to disable use 0)
-R refresh (update interval, default 2 secs, in the program is changed with the R key)
-P purge (cleaning of obsolete records after the specified time, by default 10 seconds, in the program is changed by the key P)
-F file (using a file for filters)
expr (what packages will be displayed, if not specified, then all)