IT Blog

Configuring UPnP in MikroTik

UPnP (Universal Plug and Play) – universal automatic configuration of network devices, automatically opens ports for p2p applications, games, etc.

How to record and watch the demo in Counter-Strike Global Offensive

To record a demo in CS:GO, you need to open the console with the ~ key during the game, it is near the Esc key.
If the console does not open, then it probably is disabled in the settings, open the game settings and select “Yes” where “Enable Developer Console (~)”.

Then, in the console window that opens, type the command (where NAME is any name of the demo):

record NAME

To stop demo recording in the console, type:

stop

The demo file will be saved to the directory with CS:GO, for example C:\Program Files\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\NAME.dem, other demos should be placed in the same directory.

To view demos, you need to open the player, for this, in the console, type:

demoui

Or:

demoui2

Or press the key combination Shift + F2.
Next, in the opened player, click “Load …” and select the demo.

During viewing, you can switch between players left/right keys, CTRL – opens the map, Spacebar will switch the camera to free flight mode.

What is DHCP and how does it work?

DHCP – Dynamic Host Configuration Protocol in a TCP / IP network.

Resetting the ABillS administrator password

To reset the administrator password, you need to execute the following SQL query in the ABillS database:

UPDATE admins SET password=ENCODE('NEW_PASSWORD', 'test12345678901234567890') WHERE aid=1;

Where test12345678901234567890 variable $conf{secretkey} in the file /usr/abills/libexec/config.pl.

Allow insecure connections to POP3 / IMAP iRedMail

In order to be able to connect to POP3 / IMAP without STARTTLS, you need to open the Dovecot configuration file:

sudo nano /etc/dovecot/dovecot.conf

Edit the two parameters listed below:

disable_plaintext_auth=no
ssl=yes

To return the parameters of the secure connection to POP3S / IMAPS back:

disable_plaintext_auth=yes
ssl=required

After the changes in the Dovecot configuration, you need to restart it:

sudo /etc/init.d/dovecot restart

Ubuntu IP Masquerading (NAT)

For example, I will configure IPv4 masquerading (NAT) on Ubuntu Server.
First you need to enable packet forwarding in /etc/sysctl.conf so that traffic can walk between different network interfaces.
Let’s check the current status:

Kingston SSD Firmware Update

On the test, I will update the SSD firmware of the Kingston SV300S37A 120Gb drive.

1) Download the official utility Kingston SSD Manager with firmware upgrade
https://www.kingston.com/en/support/technical/downloads/90683

2) Run the downloaded utility and if there is a firmware newer, the “Update to firmware …” button will be displayed, and click it to start the update process, which will last a few seconds.

Done, watch the video as I did:

Installing ISC DHCP for ABillS

Here is an example of the installation of the ISC DHCP server for ABillS in Ubuntu Server.

Switch to the root user:

sudo -i

Install package:

apt-get install isc-dhcp-server
ln -s /usr/abills/Abills/modules/Dhcphosts/leases2db.pl /usr/abills/libexec/leases2db.pl

Run:

/usr/abills/libexec/leases2db.pl -d LEASES=/var/lib/dhcp/dhcpd.leases

Change owner of a file:

chown www-data /etc/dhcp/dhcpd.conf

Open the config.pl in the Editor:

nano /usr/abills/libexec/config.pl

Add options:

$conf{DHCPHOSTS_CONFIG}='/etc/dhcp/dhcpd.conf';
$conf{DHCPHOSTS_LEASES}='/var/lib/dhcp/dhcpd.leases';
$conf{DHCPHOSTS_RECONFIGURE}='/usr/bin/sudo /etc/init.d/isc-dhcp-server restart';

Open in the Editor:

nano /etc/sudoers

Add the string making the ability to run a service system:

www-data   ALL = NOPASSWD: /etc/init.d/isc-dhcp-server

Go to the Abills Web interface, open the menu "settings"-"IP (DHCP)"-"Network IP (DHCP) Network", add the network if needed, then "Show, reconfigure the dhcp" and "Reconfigure".

See if the isc-dhcp-server command:

/etc/init.d/isc-dhcp-server status

Logs are written to the file/var/log/syslog

You can also configure the export of DHCP history to see it in the “Report” – “DHCP History” menu.
To do this, make a link:

ln -s /usr/abills/Abills/modules/Dhcphosts/dhcp_log2db.pl /usr/abills/libexec/dhcp_log2db.pl

Separating DHCP logs into a separate file as I wrote in the article below and adding to the Startup script with the command:

tail -F /var/log/dhcpd.log | /usr/abills/libexec/dhcp_log2db.pl