Vyacheslav

PPS Viewer Script (Packets Per Second)

The script every second displays the number of incoming and outgoing packets per second on the specified network interface.
Place the contents of the script into a file, for example, pps.sh and execute by specifying the name of the network interface (you can stop the execution of the script with CTRL+C):

Installing and using ipset

ipset – a tool consisting of a kernel module, libraries and utility, allowing you to organize a list of networks, IP or MAC addresses, etc., which is very convenient to use for example with IPTables.

Installation command in Ubuntu:

What to do if “Network Discovery” does not turn on in Windows

Once I noticed on one of the computers that nothing was displayed in the network environment, and after selecting “Enable network discovery” in “Control Panel \ Network and Internet \ Network and Sharing Center \ Advanced Sharing Options”, the choice was still on “Disable network discovery”.
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IPTables rules for FreeRADIUS

Suppose INPUT is the default DROP, I’ll give examples of IPTables rules for FreeRADIUS:

Cisco Catalyst 2960-24TT-L Firmware Update

On the test, I will upgrade the Cisco Catalyst WS-C2960-24TT-L switch.

And so, let’s connect to the switch and switch to elevated privilege mode:

enable

Let’s see the active firmware version:

show version
show boot

Continue reading “Cisco Catalyst 2960-24TT-L Firmware Update”

How to view incoming connections history in TeamViewer

When a connection is made to the computer running TeamViewer, the information about each connection is written to a text file.
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SNMP OID and MIB for Mimosa devices

I once did a Zabbix template for Mimosa B5c and explored several useful SNMP OID/MIB.

First we will enable SNMP in the device, check the connection from Linux and see the available OIDs:

Solution of the iLO error “HTTP SSL_ERROR_BAD_MAC_ALERT”

I noticed the following error when opening the iLO web interface in the browser:

Error establishing secure connection
An error occurred while connecting to 172.16.1.2. The SSL node reported an incorrect message authentication code. Error code: SSL_ERROR_BAD_MAC_ALERT
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the website owners to inform them of this problem.

Continue reading “Solution of the iLO error “HTTP SSL_ERROR_BAD_MAC_ALERT””

Updating iLO 3 firmware on HP servers

Once I set up iLO on servers and noticed that when opening an interface in the browser, an SSL error occurs and the iLO web interface does not open.

See how to temporarily solve this error in my article – Solution of the iLO error “HTTP SSL_ERROR_BAD_MAC_ALERT”.

For example, I will use HP ProLiant DL380 G7 with old firmware iLO 3 1.10 (Jul 26 2010)

Changing CPU Scaling Governor on Linux

Through “Scaling Governor”, you can choose the optimal CPU frequency control scheme, which affects power consumption and performance.

On highly loaded access servers, acquaintances had cases of server hangup during “ondemand”, although I did not have such cases, but still I recommend changing it to “performance”.
On laptops and lightly loaded servers, you can leave “ondemand” to save energy.