Eng. Alessandro Mazzanti: November 2020

Network - Iperf tool & Speed test

During this time period I had necessity to stress and measure MPLS network connectivity without using internet connectivity available on line.

In this case speed test or any other internet web site tool was not useful.

Solution was using Iperf in command line mode launching a server session in remote site and a client session on another site.

In this way there was possibility to stress network and measure relative performances.

Here they are some video examples:

http://www.iperfwindows.com/screencasts.html

Meanwhile I am taking note about a good website dedicated to test internet performances.

https://fast.com/

[update 2022.08.31]

https://4sysops.com/archives/free-network-speed-test-tools/

ESX - How to enable SNMP ON VMWARE 6.7

During these days I had necessity to enable SNMP community on Cluster ESXi Server 6.7 U2.

Here they are steps that I did for each host:

Enable SSH on each server.
Through command line giving these commands:

esxcli system snmp set --communities ruffinoro
esxcli system snmp set --enable true
Verify Firewall rules and enable traffic:

esxcli network firewall ruleset set --ruleset-id snmp --allowed-all true
esxcli network firewall ruleset set --ruleset-id snmp --enabled true
To restrict IP access to SNMP community to a specific range you might use below commands:

esxcli network firewall ruleset set --ruleset-id snmp --allowed-all false
esxcli network firewall ruleset allowedip add --ruleset-id snmp --ip-address 10.155.0.0/16
esxcli network firewall ruleset set --ruleset-id snmp --enabled true
Start SNMP Service via GUI or command line:

/etc/init.d/snmpd (re)start
Be aware that snmp is case sensitive
Disnable SSH on each server.

Cisco - How to enable custom SNMP community on SF200

Here it is a simple and straight article that guide you through SNMP custom community configuration on Cisco SF200 and other models like (Cisco Small Business devices)

https://support.auvik.com/hc/en-us/articles/204310474-How-to-enable-SNMP-and-login-on-Cisco-Small-Business-devices

Cloud - Microsoft Tutorial

Today I would like to share this Microsoft Training that explain cloud concepts and principles:

https://docs.microsoft.com/en-us/learn/modules/principles-cloud-computing/

SCCM - Video Tutorial about Microsoft Edge pushing to Hundreds/Thousands of Devices

Here it is an interesting tutorial that explain how to massive push Edge to several devices.

Edge download must be launched using below link:

https://www.microsoft.com/it-it/edge/

But for enteprise and massive pushing here it is correct download link:

https://www.microsoft.com/it-it/edge/business/download

Server - USB Anywhere

Today I would like to focalize on USB Anywhere devices that permit to connect USB devices over the network in virtualized environments such as Vmware.

This solution is ideal for connecting USB devices over the network in virtualized environments such as VMware.

AnywhereUSB 24 Plus is rack mountable with two power supplies and Ethernet connections for failover redundancy (2x Ethernet and 2 x SFP+).
Access and monitor USB and serial devices over TCP/IP connection.
Supports multi-host connectivity for each USB port or group independently.
USB 3.1 Gen 1 Type A.
Charging ability.
Connection encrypted with TLS 1.2.