ConfigBytes

So far I am not pleased with the new GNS3 07 , I’m having some serious issues in

trying to configure the settings.
Searching the internet has not yeilded much information on how to set this up. This week I’ll be “plunking” around with the new GNS3, trying to make it work. I hope to have it all figured out soon so I can upload my PIX labs that I’ve been working on.

Here’s a nice snippet I found when looking for help guest to host file sharing.

VirtualBox: access Windows-host shared folders from Ubuntu-guest
This is the scenario that you run Windows as your host operating system and Ubuntu in a VirtualBox, and that you want to access a specific Windows folder from Ubuntu.

First you have to make sure that have install Guest Additions. From the VirtualBox’s menu go to Devices → Install Guest Additions… This will mount a virtual CD on your /media/cdrom. Normally this folder’s window will show up. As root run the program VBoxLinuxAdditions.run. When the program completes reboot your VirtualBox.

Read more here!

Note that this was originally posted in May 2009

I wrote this document to help with my CCNA studies, the intent of the document was to help me quickly convert class A and B subnets for the test.  The CCNA will present subnet questions in CIDR format and you should know how to answer them in less then 90 seconds.

I converted the document from Microsoft Word 2007 to PDF using doPDF6.3 a  free PDF converter.  So far it appears to have done a nice job.  You can find it here >Do PDF

The document is here > The Last Subnet How2 Doc

Please let me know of any errors, spelling or grammar. 

(Last edited by rstaples on 20, October 2009 at 08:00 – for grammar and spelling)

Network Address Translation, sometimes called Network Address Translator (NAT), was originally outlined in RFC 1631 in 1994. This was to allow devices on the inside network the use of private IP addresses that are presently defined in RFC 1918. NAT makes it possible to have a very big internal network with thousands of local addresses represented by a handful of global addresses or possibly a single global address.

We will setup a basic static and dynamic NAT configuration.

To the left we have a basic example of how NAT operates.  Starting from the bottom we have our …

(For simplicity we will not be using subnet-zero)

• Network ID: 189.45.23.56
• First usable address: 189.45.23.57
• Last usable address: 189.45.23.63
• Broadcast address: 189.45.23.64
• Netmask of: 255.255.255.248

Read more…

By now I’m sure you’ve already read several articles that explained the pitfalls of using telnet to access your network devices, it’s not a secure way to access your network. Telnet does not offer any encryption, your login and password information is sent across the network in plain text.

Many Cisco devices today allow for SSH configuration. SSH not only allows for encryption of password and login information but also allows you devices to know who is logging in.

SSH can be configured easily on any Cisco device with IOS that supports DES or DES3 (should be using DES3).

Router (config) #username Joe password j03adM1n
Router (config-line) # login local
Router (config) # ip domain-name mylab.local
Router (config) # crypto key generate rsa
Router (config) # line vty 0 4
Router (config-line) # transport input ssh

Once you have your router configured for SSH, you will need to use a terminal program that supports SSH, such as PuTTY, Tera Term or SecureCRT.   Windows XP and Vista include a command line SSH capability, my personal favorite is SecureCRT.