Archive for December, 2010


Editing your DNS in Linux/CentOS

Filed Under: Linux admin tips by Lewis — 1 Comment
December 23, 2010

There are a few ways to change your DNS Servers and this is specifically created with CentOS but can basically be applied to any Linux distro as they all use the /etc/resolv.conf file. To configure your DNS manually you will need to modify the /etc/resolv.conf file, if you are using DHCP this will reset when you reboot the system so you will need to do one of the below methods.

Option 1: Edit your /etc/resolv.conf (Static IP)

You will replace the DNS in the /etc/resolv.conf file. After replacing the IP your resolve.conf file should look similar to the one below.

[root@hostname]# cat /etc/resolv.conf
search dynamichosting.biz
nameserver 123.123.123.1
nameserver 123.123.123.2 View full article »

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Editing Your DNS in Windows 2003

Filed Under: Windows admin tips by Lewis — 1 Comment
December 23, 2010

Editing DNS in Windows is actually pretty easy. First step is to open up your network connections.

Windows DNS Edit

From here we are going to select our internet connection and a screen should come up like below: View full article »

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In good Christmas spirit(s)…

Filed Under: Off the charts by Jacob — 2 Comments
December 15, 2010

Santa at the DH office

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Network interface issue when copying Ubuntu Server VMs in VMWare

Filed Under: Linux admin tips by Jacob — Leave a comment
December 15, 2010

If you’re looking to copy an Ubuntu virtual machine to make a clone, you’re going to run into an issue with any network interface you may have attached.

The issue stems down to how Ubuntu handles hardware. It automagically picks up new interfaces based on their MAC (hardware) address. When you copy (not move) a VM in VMWare ESXi (and most other variations), VMWare smartly assigns a new MAC to the network interface(s). That being said, Ubuntu detects this as an addition of hardware, rather than a change.

Every interface will be assigned a new eth #. So if you have eth0 and eth1 before copying, you’ll have eth2 and eth3 following the copy.
View full article »

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Using GRUB to reset your root password

Filed Under: Linux admin tips by Lewis — Leave a comment
December 13, 2010

This is for resetting your root password when you are unable to remember it, someone changes it and doesn’t tell you or can’t put a cd in the system to boot into rescue mode.

First thing to do is restart the server and wait for the boot loader menu [GRUB] to appear. At the menu, use the arrow keys to highlight the installation you want to edit and type [a] to enter into append mode. You should then see the following prompt:

<grub> ro root=LABEL=/

View full article »

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Why smartphones and tablets will be dual-core shortly…

Filed Under: Tech news and tidbits by Cliff — Leave a comment
December 9, 2010

At first glance, using dual-core processors in smartphones and tablets seems like nothing more than a great way to shorten an already too short battery life.  However, nVidia has cleared up a lot of the controversy in a fairly beefy whitepaper on Tegra2, their upcoming dual-core offering for smartphones and tablets.

“The ultimate conclusion, of course, is that smartphones and tablets will effectively follow in the footsteps of desktops and laptops, and that as far as NVIDIA is concerned, it intends to be a big part of making that happen.”

Details, and a link to the whitepaper, here:

http://www.engadget.com/2010/12/08/nvidia-touts-the-benefits-of-multi-core-processors-for-smartphon/

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Google Cloud Print is now available.

Filed Under: Tech news and tidbits by Cliff — Leave a comment
December 8, 2010

You can now print locally from your Google account when using Chrome.  Looks like it’s Windows only at the moment, but I can’t imagine that Linux and Mac flavours aren’t coming shortly.

Full details here:

http://googlesystem.blogspot.com/2010/12/google-cloud-print-now-available.html

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Congestion Control On DD-WRT Devices Using TCP Vegas

Filed Under: Linux admin tips, Tech news and tidbits by Cliff — Leave a comment
December 3, 2010

I love DD-WRT.  It takes a consumer level device and turns it into a prosumer/enterprise level device.  For free.

I found a traffic-shaping tweak that works far better than the standard QoS stuff that built in to DD-WRT.  This is also built in, but there’s no GUI-interface for it.  However, it looks very easy to implement.

“Vegas is an implementation of TCP that achieves between 37 and 71% better throughput on the Internet, with one-fifth to one-half the losses, as compared to the implementation of TCP in the Reno distribution of BSD Unix.”

Sign me up!

Full details here:

http://www.naterrific.com/2010/12/02/congestion-control-on-dd-wrt-using-tcp-vegas/

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