The Helpdesk For I.T. Administrators
As of VMWare ESX/ESXi/vSphere version 4.1 and above, you can now pass through USB devices to the guest virtual machine, as though it was directly connected to that machine. This is great for passing through USB HDD’s, USB tape drives, printers, etc. The following steps outline how to set up ESXi to pass through a …
The Linux DD command allows you to read and write directly to block devices. If you are playing around with boot loaders, dual booting, etc, its a good idea to take a copy of your master boot record just in case things go astray and you need to restore it. To backup the master boot …
The default port for SMTP is port 25, but there may be some scenarios where you may need Postfix to listen on another port as well (or instead of). For example, if you want to send emails via your own mail server, from your work computer, but the work network may be blocking all port …
On a default install of Postfix, it will listen on all interfaces/IP addresses on your machine. Sometimes this is not what you want. For example, the computer may be connected directly to the internet on one network interface, and connected to a lan on another interface, however you may not want to allow access to …
Having a computer that replies to ping requests allows for simple network connectivity tests, however there may be circumstances where you need to disable ping replies coming from your computer. This can be done using firewall rules, however Linux provides an easy way to change the kernel parameters at run time to disable ping replies. …
The netstat command on Linux shows you any active and listening network connections on the computer. If there is a connection active that you are not sure what it is, you can use the ‘-p’ (or ‘–programs’) parameter to show the process id (PID) and process name of the network connection/socket. Example: Note: to use …
Restarting HAProxy using the default init scripts will kill any existing connections, and prevent any new connections while it restarts. With the init script restart method (eg ‘/etc/init.d/haproxy restart’), if there are any configuration errors, the service wont start up again. This might be fine for low volume sites, but if you are dealing with …
This guide will outline how to write the m0n0wall embedded image to a compact flash card in windows. In this ‘how to’, I will be using the embedded-1.33.img image. Download the image file that suits your requirements from http://m0n0.ch/wall/ Download the physdiskwrite application from http://m0n0.ch/wall/physdiskwrite.php and extract it to the same folder that your m0n0wall …
If you need to access your network (be it a home network, or a work network) from a remote location, a great option is to set up some sort of VPN connection. There are a few different types of VPN connections, such as PPTP, L2TP, and IPSec, and each has advantages and disadvantages. One of …
If you have just installed OSX86, you may find that when you reboot, OSX will just not load. You can usually edit the start up parameters from the boot screen, and select to boot with -x for safe mode, and -v for verbose mode. If your PC has an ATI graphics card, you may get …