If you're new here, you may want to subscribe to my RSS feed. Thanks for visiting!
The basics for any network based on *nix hosts is the Transport Control Protocol/ Internet Protocol (TCP/IP) combination of three protocols. This combination consists of the Internet Protocol (IP),Transport Control Protocol (TCP), and Universal Datagram Protocol (UDP).
By Default most of the users configure their network card during the installation of Ubuntu. You can however, use the ifconfig command at the shell prompt or Ubuntu’s graphical network configuration tools, such as network-admin, to edit your system’s network device information or to add or remove network devices on your system
Configure Network Interface Using Command-Line
You can configure a network interface from the command line using the networking utilities. You configure your network client hosts with the command line by using commands to change your current settings or by editing a number of system files.
Configuring DHCP address for your network card
If you want to configure DHCP address you need to edit the /etc/network/interfaces and you need to enter the following lines replace eth0 with your network interface card
sudo vi /etc/network/interfaces
# The primary network interface – use DHCP to find our address
auto eth0
iface eth0 inet dhcp
Configuring Static IP address for your network card
If you want to configure Static IP address you need to edit the /etc/network/interfaces and you need to enter the following lines replace eth0 with your network interface card
sudo vi /etc/network/interfaces
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.3.90
gateway 192.168.3.1
netmask 255.255.255.0
network 192.168.3.0
broadcast 192.168.3.255
After entering all the details you need to restart networking services using the following command
sudo /etc/init.d/networking restart
Setting up Second IP address or Virtual IP address in Ubuntu
If you are a server system administrator or normal user some time you need to assign a second ipaddress to your Ubuntu machine.For this you need to edit the /etc/network/interfaces file and you need to add the following syntax.Below one is the only example you need to chnage according to your ip address settings
sudo vi /etc/network/interfaces
auto eth0:1
iface eth0:1 inet static
address 192.168.1.60
netmask 255.255.255.0
network x.x.x.x
broadcast x.x.x.x
gateway x.x.x.x
You need to enter all the details like address,netmask,network,broadcast and gateways values after entering all the values save this file and you need to restart networking services in debian using the following command to take effect of our new ipaddress.
After entering all the details you need to restart networking services using the following command
sudo /etc/init.d/networking restart
Setting your ubuntu stytem hostname
Setting up your hostname upon a ubuntu installation is very straightforward. You can directly query, or set, the hostname with the hostname command.
As an user you can see your current hostname with
sudo /bin/hostname
Example
To set the hostname directly you can become root and run
sudo /bin/hostname newname
When your system boots it will automatically read the hostname from the file /etc/hostname
If you want to know more about how to setup host name check here
Setting up DNS
When it comes to DNS setup Ubuntu doesn’t differ from other distributions. You can add hostname and IP addresses to the file /etc/hosts for static lookups.
To cause your machine to consult with a particular server for name lookups you simply add their addresses to /etc/resolv.conf.
For example a machine which should perform lookups from the DNS server at IP address 192.168.3.2 would have a resolv.conf file looking like this
sudo vi /etc/resolv.conf
enter the following details
search test.com
nameserver 192.168.3.2
Thanks for the very helpful info! I got the networking going from the shell thanks to this.
After I edit this file “/etc/network/interfaces”, how do I save the changes and exit the editor? I’m using vi.
“vi /etc/network/interfaces
Answer to my question. (”After I edit this file “/etc/network/interfaces”, how do I save the changes and exit the editor? I’m using vi.”)
Vi has two modes insertion mode and command mode. The editor begins in command mode, where the cursor movement and text deletion and pasting occur. Insertion mode begins upon entering an insertion or change command. [ESC] returns the editor to command mode (where you can quit, for example by typing :q!). Most commands execute as soon as you type them except for “colon” commands which execute when you press the return key.
:q Exit as long as there have been no changes
ZZ Exit and save changes if any have been made
:q! Exit and ignore any changes
Shelby,
Thanks for your informative response. I have done researched on the internet also and found more abuot vi editor. I setup my internet now and can download files. My problem now is, I have downloaded and installed ubuntu-desktop already and when I input startx, it says Fatal Server error: no screen found. Any ideas?..Anyway this can be not part of this thread anymore. I have read also from other thread that this can be on driver issue. Again, Thanks to you guyz. I start to love ubuntu now.
Regards,
Tuv
More fun and challenging using ubuntu via command line. I learned a lot.
Awesome post… keep up the good work.
- B
it works for me but i can’t access my http://localhost or http://127.0.0.1 or http://###.###.#.##
I think in order to have your localhost as a web page you have to run apache2 -k start
This is interesting web place. I like it.
Hi,
I am fairly new to SQUID and have followed the instructions above, have set my proxy server to be the IP address of the squid server with port 3128 but am unable to access the web.e.g. google.
After a couple of minutes I get a message from the squid server saying that the requested URL cannot be found. connection to 209.85.227.99 failed. I have verified that I can ping the above address from a command line on the Squid server.
The server is running on an ESX 3i server. I am able to access the web console via the https:ip:10000 website.
I think I may need to connect a second lan Connection from the ESX host to our DMZ and perhaps open a few ports on the firewall but not having much experience with SQUID I could be wrong.
Any help greatly appreciated,
Thanks
Paul.
Hi,
Quick update I have now managed to get a step further and am now getting the message
Access Denied.
Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.
I have tried to look at the ACL list on the web browser but not really getting anywhere,
Cheers
Paul.
I can’t use my net (BORD BAND) in my Linuxe
Ubunt 2
Hi everyone,
I am working on a project for all the operative systems, but I didn’t use that much LINUX(Ubuntu) and I don;t have enough info. Could you help me solve these exercises since they are a part of my project.
Here is a link of my exercises:
http://www.speedyshare.com/553182178.html
Procedure:
write in a file the steps that you have used and the results that you are getting (you can do it in a photo too or anything that suits you best.
Very good article to setup..Thanks
Paul Yearron;
We use apache2 and there are .conf files like httpd ports. and apache2.conf which you can edit and set your PORT numbers there.
I do not know Squid sorry and am new to linux but I have played with our webserver (without crashing it lol) and found out basically how the ports are set.
we also use zope and plone which are simple to configure but hard to get them to come up right!!? I mean the conf files are in plain English but the program(s) depend on many other factors like having a real IP address from your ISP and also configuring the network via files under /etc and /etc/network/
files such as resolv.conf interfaces.conf etc. etc.