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.
Author Archives: Vyacheslav
TP-Link TL-WR340G Firmware Update
First, check the hardware version of the device, it is indicated on the label under the router. Upgrading the firmware from the wrong version of the device can spoil it! You can not update the firmware via Wi-Fi and turn off the power of the router during the firmware!
Continue reading “TP-Link TL-WR340G Firmware Update”How to change open_files_limit in MySQL
I will give an example of viewing and increasing the open_files_limit parameter in MySQL.
Will perform operations in the Ubuntu Server 16.04.
D-Link DSL-2640NRU firmware upgrade
On the test, I will update the firmware of the D-Link DSL-2640NRU modem from version 1.0.0 to 1.0.32.
Continue reading “D-Link DSL-2640NRU firmware upgrade”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”Solution “Port is not compatible with aggregators in channel 1 and cannot attach to them”
Once on Cisco Catalyst 6509-E, when I collected an aggregation of three ports, traffic began to go through only two ports and a message appeared in the logs:
Continue reading “Solution “Port is not compatible with aggregators in channel 1 and cannot attach to them””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»”Access-Control-Allow-Origin (CORS)
CORS (resource sharing between different sources) is browser technology that allows a web page to access resources from another domain.
To enable CORS in Apache2, you must first activate the headers module, in Ubuntu Server, you can do this with the command:
Continue reading “Access-Control-Allow-Origin (CORS)”