August 20, 2007 · General, Security, Server · 10 comments

SSH is a great way to remotely administer a server. However, it still has a number of issues when you open it up to the world. The server and client communications are secure but that doesn't mean the hosts involved are. Opening an SSH service to the world allows for brute force attacks and means that the carbon interface is still the weakest link.

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July 21, 2007 · Networking · (No comments)

Gip is an IP address calculator that integrates well with the GNOME desktop environment.Gip provides system administrators with tools for IP address based calculations. For example, an administrator who needs to find out which IP prefix length equals the IP netmask 255.255.240.0, just types in the mask and gets the prefix length presented. But many more advanced calculations can be made. Gip can convert an address range into a list of prefix lengths. It can also split subnets using a given IP netmask or IP prefix length. Many more calculations are possible.

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June 24, 2007 · Networking · 41 comments

Setting up a computer to share its internet connection should be easy.After all, you've successfully networked your computers together and even shared files with all your home computers, so why not the Internet? Well if you have a small home network of computers all connected and have tried to open up a browser, you've probably found out that things aren't quite as straight forward as connecting one machine with an Ethernet cable to the computer that has the DSL/cable modem.

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June 18, 2007 · Networking · (No comments)

Sendmail is a Mail Transfer Agent, which is the program that moves mail from one machine to another. Sendmail implements a general internetwork mail routing facility, featuring aliasing and forwarding, automatic routing to network gateways, and flexible configuration.

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