IT Blog - Page 86 of 153 - Vyacheslav Gapon - personal blog, manuals, articles, notes, development

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!

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.

How to change “open files” in Linux

I will give an example of viewing and increasing the value of “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:

Moving ABillS to another server

On the test I will transfer the ABillS billing system from one server to another.

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:

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:

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:

TRENDnet TEW-651BR firmware update

For example, I will use TRENDnet TEW-651BR with firmware 2.00nb03.