Author Archives: Vyacheslav

How to change the welcome screen image in Windows 7

To change the welcome screen image in Windows 7, you must:

1) Open the registry editor, to do this, click the “Start” menu and in the “Run” line we write “regedit” and press the “Enter” key.

2) In the registry editor that opens, right-click on the “HKEY_LOCAL_MACHINE” line, select “Find” and in the search bar type “OEMBackground”, click “Find Next”.
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The solution of the error “d3dx9_31.dll was not found” when running games

This error may occur if the computer has an old version of DirectX installed, so it is solved simply by downloading and launching a web installer that automatically updates DirectX via the Internet to the latest version.

Download the DirectX web installer from the link below:

https://www.microsoft.com/en-US/download/details.aspx?id=35

How to enable USB debugging on Android

To enable USB debugging in the Android operating system, you need to open “Settings” – “Developer options” and tick “USB Debugging“.
If this menu is not available in the settings, you need to open “Settings” – “About Phone” and tap (touch) the item “Build number“, then the “Developer Options” item should appear in the settings.

USB debugging mode allows you to work with the device using the ADB utility, install and uninstall programs via ADB, view debug messages, be able to get root rights (full access to the operating system), etc.

Set up WatchDog by ABillS

In the ABillS billing system, you can configure the status check of any running programs, and configure automatic launch if any of them are not running.

For example, for tracking FreeRadius, you need to run the command:

/usr/abills/libexec/billd check_programs PROGRAMS="radiusd:/etc/init.d/radiusd start"

Where “radiusd” is the name of the program in the processes, and “/etc/init.d/radiusd start” the command to start it.

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Configuring SNMP Traps on D-Link Switches

I will give an example of setting up SNMP Traps sending on D-Link switches.
For example, I will take the switches D-Link DES-3200-x:

Create an SNMP password:

create snmp community public view CommunityView read_only

We indicate which host and with which password the traps should be sent:

create snmp host x.x.x.x v2c public

We indicate the change in the state of which ports to send traps:

config snmp link_traps ports 01-24 disable
config snmp link_traps ports 25-26 enable

Check the configuration of sending snmp traps with the command:

show snmp traps

Check the configuration of sending snmp traps on the status of ports with the command:

show snmp traps link_traps

At the end of the command, you can digitize port numbers.

See also my article:
Installing and using Net-SNMP

Block third-party DHCP servers on the Huawei Quidway S2300 (DHCP Snooping)

I will give an example of how on the Huawei Quidway S2300 switch (using the S2326TP-EI as an example) to allow receiving DHCP responses from the uplink port and prohibiting client responses.

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