For example, take the server with the operating system Ubuntu Server 14.04, in which let’s say we changed the network settings when executing the commands:
Continue reading “Why service networking restart or /etc/init.d/networking restart does not work”Category Archives: Linux
Restricting access to cPanel by IP
In cPanel, you can enable question control for unknown IP addresses.
After entering the correct username and password, 4 questions will be asked.
Install and configure tftpd-hpa
I will give an example of installing a tftpd server tftpd-hpa.
Continue reading “Install and configure tftpd-hpa”Accel-ppp debug
I will give an example of accel-ppp build with debugging information support, for example, in order to find out the cause of the crash.
Continue reading “Accel-ppp debug”How to detect DDOS attacks
I will give examples of viewing the number of active compounds:
Continue reading “How to detect DDOS attacks”The script against DDOS attacks
I will give an example of a simple script against DDOS attacks for NAT servers.
The script is executed when the total number of “conntrack” connections is more than 500000, it saves to the text file the IP address which has the most “conntrack” connections, who has more than 10,000 – adds to the ipset list.
How to change “open files” in Linux
I will give an example of viewing and increasing the value of “open files” in Linux.
Continue reading “How to change “open files” in Linux”Moving ABillS to another server
On the test I will transfer the ABillS billing system from one server to another.
Continue reading “Moving ABillS to another server”Configuring L4-Redirect-ipset for Accel-ipoe and ABillS
In order to authorize clients with a negative balance Accel-ppp to add IP addresses to the ipset list, add the following to its configuration, in the ipoe section:
Continue reading “Configuring L4-Redirect-ipset for Accel-ipoe and ABillS”Solution «TX driver issue detected, PF reset issued»
Once on one high-load access server with about 5 Gb/s traffic in /var/log/syslog, errors began to appear frequently:
Continue reading “Solution «TX driver issue detected, PF reset issued»”