Preventing STP forwarding loops

The Spanning Tree Protocol is an OSI layer-2 protocol that ensures a loop-free topology for any bridged LAN. Spanning tree allows a network design to include spare (redundant) links to provide automatic backup paths if an active link fails, without the danger of bridge loops, or the need for manual enabling/disabling of these backup . . . → Read More: Preventing STP forwarding loops

Troubleshooting Errdisable Ports on Cisco

Contents Introduction Prerequisites Requirements Components Used Background Information Platforms That Use Errdisable Errdisable Function of Errdisable Causes of Errdisable Determine If Ports Are in the Errdisabled State Determine the Reason for the Errdisabled State (Console Messages, Syslog, and the show errdisable recovery Command) Recover a Port from Errdisabled State Correct the Root Problem . . . → Read More: Troubleshooting Errdisable Ports on Cisco

MikroTik remote logging using rsyslog

/etc/rsyslog.conf Uncomment these lines, since RouterOS sends log via UDP on port 514: $ModLoad imudp $UDPServerRun 514

/etc/rsyslog.d/50-default.conf Add line(s): :fromhost-ip,isequal,”192.168.x.1″ /var/log/mikrotik-Router1.log :fromhost-ip,isequal,”192.168.x.2″ /var/log/mikrotik-Router2.log

Restart the rsyslog service: sudo service rsyslog restart

Various ways to view logs: System Log Viewer (GUI) Terminal: tail -f /var/log/mikrotik-Router1.log

* Don’t forget to allow IP traffic through firewall

. . . → Read More: MikroTik remote logging using rsyslog

IOS Upgrade on Cisco WS-C4507R Chassis with Dual Supervisor V Engines

Today we will upgrade the IOS version on both WS-X4516 supervisor engines V in a WS-C4507R chassis. This blog post assumes that your 4507R chassis’s supervisor engine already has network support for you to SSH into it.

First, go to the Cisco support site and download the latest IOS version (you need . . . → Read More: IOS Upgrade on Cisco WS-C4507R Chassis with Dual Supervisor V Engines

So You bought Dell PowerConnect 64xx Switches For Your Equallogic

Here is my favorite set of commands to get those beasts up and running

Continue reading So You bought Dell PowerConnect 64xx Switches For Your Equallogic

After upgrading to vCenter Server 5.5 Update 1, logging in to vCenter Server reports the error: Failed to verify the SSL certificate for one or more vCenter Server systems (2074942)

Well this certificate Issue generates a multiple of probllems. After upgrading an old installation to accommodate for vmware Horizon 6 i discovered that view storage acceleration was not available from my vCenter. One thing led to another and it turns out it’s a certificate issue. My installation was living all this time with a 512bit Key which needed upgrading. After this you need to reregister all vmware servivces relevant.
Here goes some cut and paste

Continue reading After upgrading to vCenter Server 5.5 Update 1, logging in to vCenter Server reports the error: Failed to verify the SSL certificate for one or more vCenter Server systems (2074942)

Plesk 11.5.30 on CentOS

Installation

Let’s install Plesk not via the Autoinstaller but instead use the super useful tool called the One Click Installer. Instead of downloading a package and then installing it to get the ball rolling, One Click determines your OS and does the whole shebang in one fair swoop.

Here’s how to use it:

wget . . . → Read More: Plesk 11.5.30 on CentOS

Adding a custom route to a VPN in Mac OS X

Me and my colleagues at work were facing a problem. We’re using a VPN to access our internal servers and for some reason Mac OS X always uses a 24 bit netmask with the VPN connection (when we need a 16 bit). Of course there’s a solution for this.

Open your favourite text editor. . . . → Read More: Adding a custom route to a VPN in Mac OS X

Lock Down Remote Desktop Services Server 2012 / RDS 2012 R2

Preparation

Create OU for RDS Server in Active Directory. Create security group for users who will use Remote Desktop Host (i.e. RDS Users). Create GPO (i.e. RDS Server Lock Down). In Security Filtering delete Authenticated Users, add RDS Server Computer Account, and the security group created in previous step.

 

Filter using security groups . . . → Read More: Lock Down Remote Desktop Services Server 2012 / RDS 2012 R2

UniFi Controller Debian Wheezy guide

To install the Unifi controller you will need to add Ubiquiti’s and mongodDB’s repo to the sources list echo “deb http://www.ubnt.com/downloads/unifi/distros/deb/debian debian ubiquiti” >> /etc/apt/sources.list echo “deb http://downloads-distro.mongodb.org/repo/debian-sysvinit dist 10gen” >> /etc/apt/sources.list You now need to add GPG keys apt-key adv –keyserver keyserver.ubuntu.com –recv C0A52C50; apt-key adv –keyserver keyserver.ubuntu.com –recv 7F0CEB10 You can . . . → Read More: UniFi Controller Debian Wheezy guide