JunOS : Alarm Management Ethernet Link Down

Having the red alarm led on but nothing is wrong with your JunOS powered Juniper device? First, look out what alarm is triggered by issuing the following command :

If absolutely nothing is really wrong, you will see the following alarm : Alarm time Class Description 2016-01-20 07:11:59 UTC Major Management Ethernet Link Down… Read More »

IOS : Extended VLAN(s) not allowed in current VTP mode

Having the following output message while trying to create a VLan outside higher than 1000 on your Cisco device?

This mean that you are running VTP mode 1 or 2, which only support VLan range between 1 – 1000. To be able to create anything outside of that scope, you need to run VTP… Read More »

Linux : Port forwarding with IPtables

Need to forward a custom port to an existing port on your Linux box? Simply use the following command as root :

Example : Assuming you want to forward port 1025 to port 587 :

The command above won’t survive to reboot, see the configuration below to enter in the IPTables script :… Read More »

Mac : Unable to negotiate with x.x.x.x port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1

With the latest macOS Sierra 10.12 release, you might have observed issue connecting to servers or network devices running SSH. Please note that this article does not necessary apply or macOS, but any running OS with the latest OpenSSH v7. Because of the latest OpenSSH version, some older (legacy) encryption algorithm have been removed from… Read More »

Linux : How to setup client/server NFS on SuSE

This post will cover the complete installation and setup of a NFS client and server on SuSE Linux. By default, the system include the NFS client but not the server. First of all, make sure that NFS traffic is allowed if you are running any firewall on the client/server machine. You can achieve this through… Read More »

VMware : Basic ESXi commands

You will find below some basic and useful commands to operate a ESXi hypervisor from the command line. Put the host in maintenance mode (or leave maintenance mode) :

List all VMs registered on the host :

Verify the power state of a specific VM :

Power on a specific VM :… Read More »

Web : Updating ownCloud to version 8.1.9 was unsuccessful

Using ownCloud repo and encountered the following error while upgrading to version 8.1.9? Updating ownCloud to version 8.1.9, this may take a while. Set log level to debug – current level: “Warning” Turned on maintenance mode Checked database schema update Checked database schema update for apps Updated database Exception: App can’t be installed because it… Read More »

Category: Web