Paolo Pizzolongo

Basic VLAN concepts

Feb 22, 2020 ~ Scritto da paolo

Based on HP
You can configure the link type of a port as access, trunk, or hybrid. The link types use the following VLAN tag handling methods:

  • Access: an access port can forward packets from only one VLAN and send these packets untagged. An access port can connect a terminal device that does not support VLAN packets or is used in scenarios that do not distinguish VLANs.
  • Trunk: a trunk port can forward packets from multiple VLANs. Except packets from the port VLAN ID (PVID), packets sent out of a trunk port are VLAN-tagged. Ports connecting network devices are typically configured as trunk ports.
  • Hybrid: a hybrid port can forward packets from multiple VLANs. The tagging status of the packets forwarded by a hybrid port depends on the port configuration. A hybrid port can connect a network device or terminal device that can identify packets tagged with some VLANs.

The PVID identifies the default VLAN of a port. Untagged packets are transmitted through the default VLAN.

When you configure the PVID on a port, follow these guidelines:

  • An access or trunk port sends packets from the default VLAN untagged.
  • A hybrid port can send packets from the default VLAN tagged or untagged.
  • An access port can join only one VLAN. The VLAN to which the access port belongs is the PVID of the port.
  • A trunk or hybrid port supports multiple VLANs and the PVID configuration.

Based on Cisco:
Each port or LAG is marked with one of the following modes:

  • Access: port belongs to a single untagged VLAN. When a port is in Access mode, the packet types that are accepted on the port (packet type) cannot be designated. It is not possible to enable/disable ingress filtering on an access port.
  • Trunk: port can be member of one or more VLANs. It is an untagged member of at most one VLAN, and is a tagged member of all other VLANs of which it is a member.
  • General: port can be tagged or untagged and be members of one or more VLAN. (full 802.1Q mode).

For each port or LAG (Link Aggregation Group), select one of the following values:

  • Forbidden: port is not able to join the VLAN even if it is was dynamically added using a protocol such as GVRP.
  • Excluded: port is not a member of the VLAN. However, the interface can be added to the VLAN through GVRP. This option is not available for the default VLAN.
  • Untagged: interface is an untagged VLAN member. Packets forwarded by the interface are untagged.
  • Tagged: interface is a tagged member of a VLAN. All packets forwarded by the interface are tagged and contain VLAN information.

For each port or LAG, one or both of the following values may be selected:

  • PVID: port PVID is set to this VLAN.
  • Multicast TV VLAN: select to make the port a member of the selected VLAN as a Multicast TV VLAN. This option is grayed out for Trunk and General port modes.

Pubblicato sotto News - con tag , , , ,

How to setup a trigger on first value and on value change with zabbix

Feb 02, 2020 ~ Scritto da paolo

Trigger Expression:

{MyTemplate:MyItem.count(#2)}<2 or {MyTemplate:MyItem.diff()=1}

Pubblicato sotto Linux, Server - con tag ,

Calculate the Prints Monthly Average on Zabbix

Gen 30, 2020 ~ Scritto da paolo

Assuming that “pagecount” is the global counter item of our printer we can create a calculated item with the following expression:

max(pagecount,2592000)-min(pagecount,2592000)

where 2592000 is the number of seconds (30 days, i.e 60sec x 60min x 24hours x 30days) of our interval to get the minimum and the maximum number detected.

Pubblicato sotto Linux, Server - con tag , , ,

Install RSAT – Remote Server Administration Tool

Gen 20, 2020 ~ Scritto da paolo

https://www.google.com/search?client=firefox-b-d&q=install+rsat+windows+10+1909

and

https://gallery.technet.microsoft.com/Install-RSAT-for-Windows-75f5f92f

Download the ps1 Powershell file and execute it.

Pubblicato sotto Server, Windows Server - con tag , , , ,

How to use PHPSpreadSheet with composer on Debian 10

Gen 16, 2020 ~ Scritto da paolo

from root:
apt-get install composer php-cli

from user:
composer require phpoffice/phpspreadsheet

Into myfile.php (example):

require_once('vendor/autoload.php');
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
// Creates New Spreadsheet
$spreadsheet = new Spreadsheet();
// Retrieve the current active worksheet
$sheet = $spreadsheet->getActiveSheet();
// Set the value of cell A1
$sheet->setCellValue('A1', 'Paolo');
// Sets the value of cell B1
$sheet->setCellValue('B1', 'Pizzolongo');
// Write an .xlsx file
$writer = new Xlsx($spreadsheet);
// Save .xlsx file to the current directory
$writer->save('paolo.xlsx');

Pubblicato sotto Linux, Server - con tag , , , ,

How to install and use youtube-dl

Gen 16, 2020 ~ Scritto da paolo

Available also with apt-get on debian, this repository package is usually not updated to the latest version. Consider to donwload it manually and use standalone.

wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/bin/youtube-dl

chmod a+rx /usr/bin/youtube-dl

for updates:youtube-dl -U

youtube-dl <video_url>

To specify a format: youtube-dl -F <video_url>

To download with a specific format youtube-dl -f <chosen_format><video_url>

For subtitles:

youtube-dl --list-subs <video_url>

youtube-dl --all-subs --skip-download <video_url>

For Playlists: youtube-dl -cit <playlist_url>

Only Audio: youtube-dl -x --audio-format mp3 <video_url>

Pubblicato sotto Linux, Server - con tag , , , ,

Useful Software

Gen 10, 2020 ~ Scritto da paolo
Flashback Recorder: https://www.flashbackrecorder.com/express/
Record audio and video from desktop or meetings
Velocity Console: https://www.wavelink.com/Download-Velocity_enterprise-app-modernization-Software/
Configure Ivanti Terminal Emulation for android devices
Sysinternals Suite: https://docs.microsoft.com/en-us/sysinternals/downloads/sysinternals-suite
Suite of many useful tools for windows os management
Rufus: https://rufus.ie/it_IT.html
Tool for freating bootable USB drives from .ISO files
Heidi SQL: https://www.heidisql.com/
Tool to manage MySQL, MariaDB, Postgres, SQL Server databases
WinSCP: https://winscp.net/eng/download.php
Connect and manage files through SFTP connctions
QR Code Studio: https://www.tec-it.com/it/download/free-software/qrcode-studio/Download.aspx
Generate QR Codes from text
FreeFileSync: https://freefilesync.org/
Copy, sync and backup files

Pubblicato sotto News - con tag ,

Zabbix 3.0 to 4.0 Upgrade during Debian 9 to 10 Ugrade

Gen 06, 2020 ~ Scritto da paolo

stop zabbix services
change apt soutrces from stretch to buster
apt update
apt install –only-upgrade ‘zabbix.*’
apt install –only-upgrade ‘zabbix-server.*’
apt install –only-upgrade ‘zabbix-agent.*’
apt upgrade
apt full-upgrade
reboot
apt –purge autoremove
start zabbix services (during the new start of services the database will be updated)

Pubblicato sotto Linux, Server - con tag ,

Send Mail with PHPMailer as debian 10 meta-package

Gen 06, 2020 ~ Scritto da paolo

install on the debian server the following package:

apt-get install libphp-phpmailer

and use it as in the example below:

require("/usr/share/php/libphp-phpmailer/autoload.php");
$mail = new PHPMailer\PHPMailer\PHPMailer();
$mail->IsSMTP(); 
$mail->SMTPAuth = false; 
$mail->SMTPSecure = false; 
$mail->SMTPAutoTLS = false; 
$mail->Host = ""; 
$mail->Port = 25; 
$mail->IsHTML(true); 
$mail->SetFrom("from@mydomain.tld"); 
$mail->Subject = "my subject"; 
$mail->Body = "my body"; $mail->AddAddress("to@anotherdomain.tld"); 
if(!$mail->Send()) { 
     echo "Mailer Error: " . $mail->ErrorInfo;
} else {
     echo "Message has been sent";
}

Pubblicato sotto Linux, Server - con tag , ,
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