Nothing complicated, just create an ACL rule, due to which on certain ports the switch will drop or pass packets that go to client port 67 from a DHCP server and thus it will not receive IP from unnecessary DHCP servers.
Continue reading “Blocking DHCP packets on D-Link DES-38xx”How to disable guest access in Ubuntu
Open the configuration file for the LightDM display manager in a text editor, which is used by default for Ubuntu and Xubuntu distributions:
Continue reading “How to disable guest access in Ubuntu”Shutting down the Linux server with the Power button
There were cases when it was urgent to turn off some Linux Ubuntu servers using the Power button, but when it was pressed, nothing happened. And to go over SSH and enter the poweroff or shutdown commands, the option is not optimal. So the solution to this inconvenience is to install ACPID (Power Management Services):
Continue reading “Shutting down the Linux server with the Power button”How to write CRON logs to a separate file
By default, cron logs are written to the /var/log/syslog file, and the result of the tasks is sent to an email to the user on whose behalf the task is executed, for example, when I executed the script, an entry was added to /var/log/syslog:
Continue reading “How to write CRON logs to a separate file”Installing Rsyslog + Loganalyzer + MySQL
I will give an example of installing and configuring Rsyslog + Loganalyzer + MySQL.
Continue reading “Installing Rsyslog + Loganalyzer + MySQL”Installing and using Tshark & Wireshark
Wireshark (formerly Ethereal) is a traffic analyzer program for computer networks. Tshark is the console version, wireshark is the GUI version.
Continue reading “Installing and using Tshark & Wireshark”How to hide email on a site from spammers
The first way through JavaScript:
Continue reading “How to hide email on a site from spammers”Installing and using Ettercap
Ettercap is a tool for analyzing computer network security.
Continue reading “Installing and using Ettercap”Installing and starting the Teamspeak3 voice server
Download the Teamspeak3 server distribution from the official site https://www.teamspeak.com/en/downloads/
Near the Download button there is also a link copy button, after which you can download directly to the server with the command:
Clearing FDB tables on D-Link DGS-3100 from CRON
In 2013, I came up with a primitive solution to the problem with the D-Link DGS-3100 switch, which with an average load can often stop passing traffic through itself.
Continue reading “Clearing FDB tables on D-Link DGS-3100 from CRON”