How to Create VLAN Trunking on Cisco Catalyst Switch – If you have multiple switches that are part of a stack, then any VLAN you create on the master switch is available on all the switches in the stack. However, if you have multiple switches that are not part of stack, and if you need to use the same VLAN between these two switches, you need to use VLAN trunking. This tutorial explains how to configure VLAN trunking between two different switches.
These are my links for 9 apr 2013 through 11 apr 2013:
Apache VirtualHosts and SELinux under CentOS 6 | SilverStripe CMS Developer Blog – This article briefly describes how to move virtual hosts outside the standard /var/www/html directory in CentOS 6.x. By default SELinux in CentOS does not allow the httpd process to access files outside the standard /var/www/html directory. One side effect of not having the access permission is that properly configured virtual hosts resolve to the default directory without any errors in server's log files. This makes it difficult to troubleshoot without installing additional tools.
These are my links for 28 dic 2012 through 9 gen 2013:
PeteNetLive – KB0000741 – HP and Cisco – VLANs and Trunks Confusion! – When I first started in IT, I went and did my Cisco CCNA. So I learned that to connect Cisco switches and pass VLAN traffic between them, I needed to create a 'Trunk' to pass the VLAN traffic. Fast forward a few years, and I now work for an HP reseller. Very early on I came to realise that what HP called a 'trunk' was very different from what I had been taught. Below is an article I did a while ago about setting up HP Trunks.
OpenNOP – Open Network Optimization Platform – OpenNOP is an open source Linux based network accelerator. It's designed to optimise network traffic over point-to-point, partially-meshed and full-meshed IP networks. The goal of OpenNOP is to increase network performance over low speed network connections such as ISDN, DSL, DS1, frame-relay, VPN and other network circuits. To accomplish this we can use a variety of techniques such as compression, deduplication, caching and protocol spoofing. The objectives for OpenNOP are: Produce a low cost solution to increase network performance, improve the end user experience and deliver this in a easy to use appliance image. Provide a single solution for networks on terrestrial, cellular and satellite systems. Facilitate an open framework that can be extended by 3rd party modules to improve specific network traffic.
Deon’s World – Understanding and using htop to monitor system resources – Every so often there will be something that slows a system down. There are a few tools that can help to identify which process is the cause of this slow down. One such tool is htop. Htop is an interactive and real time process monitoring application for Linux which will show you your usage per cpu/core, as well as a meaningful text graph of your memory and swap usage.
Netl33ts: Cisco VPN Troubleshooting Guide – It is important to understand how IPSEC works in order to understand how to troubleshoot a VPN connection. This is a quick overview of IPSEC and is by no means a complete detailed guide.
TunnelsUP: Home – Welcome to tunnelsup.com! This site aims to document how to set up, troubleshoot and understand everything to do with Cisco VPN concepts. Here you will find scripts for putting together a tunnel, troubleshooting tips and videos that will teach concepts and demonstrate various VPN technologies.