Archivio tag: troubleshooting

Bookmarks for 28 dic 2012 through 9 gen 2013

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.

Bookmarks for 27 dic 2012 through 28 dic 2012

These are my links for 27 dic 2012 through 28 dic 2012:

  • SyBooks Online: Back Up Data to a New Table (on sybase 12.x) – Copy the data from the corrupted table into a new table by creating a dummy table, and copying the old data into the dummy table.
  • 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.

Bookmarks for 29 nov 2012 from 15:24 to 16:55

These are my links for 29 nov 2012 from 15:24 to 16:55:

  • PowerShell Commands (CMDLETs) for Active Directory by Quest – The ActiveRoles Management Shell for Active Directory is a set of free, predefined commands for Windows PowerShell, the powerful command line and scripting language developed by Microsoft. These commands are designed to help administrators automate common, repetitive and bulk management tasks for Active Directory, such as creating, removing or updating objects in AD.
  • PowerGUI.org – Free Windows Powershell Community – Welcome to PowerGUI.org – a free community for PowerGUI, a graphical user interface and script editor for Microsoft Windows PowerShell!
  • ksh_timer – An interface to evaluate function execution time in shell script in each function or in user-defined sections

    Summary:  ksh_timer helps ksh script developers or administrators to find out quickly and with minimal change in their script, what functions or user-defined sections are time consuming. By default, ksh_timer will time the overall script and each function defined and used in the script. Users can define additional sections of the scripts they need to be timed.

Bookmarks for 6 nov 2012 through 13 nov 2012

These are my links for 6 nov 2012 through 13 nov 2012:

  • Howto: Change the IP address of a Dell 4/P DRAC from the command line without rebooting the server – Normally you configure a Dell Remote Access Card (DRAC) when a server is initially commissioned. Once the card is set, administrators rarely if ever need to modify the settings. If you do need to change the settings, the server needs to be restarted so the DRAC BIOS can be modified, which obviously results in system downtime and requires a physical presence at the server console.
  • bash ini parser | /var/log/ajdiaz – In some situations i like to use INI files as configuration files, as python do. But bash do not provide a parser for these files, obviously you can use a awk code or a couple of sed calls, but if you are bash-priest and do not want to use nothing more, then you can try the following obscure code:
  • Jugg Monkey: VMWare HA Agent had an error – I recently had a problem with one hoste in a 3 node VMWare ESX 3. 5 cluster. For some reason, the HA Agent would not start after I applied outstanding software updates. I kept receiving "VMWare HA Agent had an error" in the alerts after the host came online. I had recently needed to change the IP address of the VMWare 3.5 ESX host, so I figured that was the root cause.