Vyacheslav, Автор в IT Blog

List and description of existing Wi-Fi frequencies, standards

In this article I will provide a list and description of existing Wi-Fi frequencies, standards.

Automatic switching between backup channels on MikroTik (RouterOS)

Suppose there are two Internet channels, from different or one provider, the gateway can be the same, it does not matter. They are connected to the first and second ports.

Nginx. Parameter default_server

The default_server parameter defines the default server to which a client request will be sent in which the host field is empty or an unknown domain is specified in it. For example, when a client opens the server IP address in a browser, or when the server has several domains, for example, ixnfo.com, test1.ixnfo.com, test2.ixnfo.com, but not all domains are specified in the ngixn configuration.

Installing Memcached

Let me give you an example of installing Memcached, which allows you to cache data in RAM.

ABillS. How to run periodic on January 2

Once, one Internet provider asked me that ABillS should not charge the subscription on New Year’s Eve, so that users who forgot to replenish their account do not disconnect at midnight.

UniPing v3 firmware update

To update the software on a UniPing v3 device, you must:

Solution the error “rc_avpair_new: unknown attribute 1490026597”

I noticed once an error in the logs /var/log/syslog:

How to turn off iPhone without a power button

In fact, the device can be fully controlled using only the touch screen, for this you need to enable Assistive Touch in the settings.

Why in media converters the LFP switch

Some media converter models have an LFP switch. It is needed so that when the optics disappear the copper port is turned off and vice versa, if there is no link on the copper port, the optical one will also be turned off.

Zabbix Backup

Invented and sketched a couple of lines for backup mysql database and directories with http files.