Setup firewall with iptables in Ubuntu (Part 4)

Creating and installing firewall scripts
I assume that you’ve already familiar with runlevels process. If you still don’t know about runlevels, you can go my tutorial about ‘Runlevels in Ubuntu‘ first.
If you are ready then let’s start a practice with creating our iptables script.
 
There 4 steps for you [...]

Read Full Post »

Runlevels in Ubuntu

If you have a script and you it run automatically during loading process then you have to know to runlevels process in Ubuntu. At first time you learn about runlevels, you may find yourself in a bit hard time to figure out how it work. There are [...]

Read Full Post »

Setup firewall with iptables in Ubuntu (Part 3)

Masquerading (Many to One NAT)
NAT = Network Address Translation
Mean that all traffics from your networks behind the firewall will be appear on the internet as if as it is only originated form a single ip address.
The masquerade IP address always defaults to the IP address of the [...]

Read Full Post »

Setup firewall with iptables in Ubuntu (Part 2)

Samples of iptables’ rules.
 
# Accept TCP packets for routing from eth0 (any IP) and destined for IP 192.168.1.58
# that is reachable via eth1.
# -A : Append rule to end of a chain
# FORWARD : Filters packets to server accessible by another NIC on the firewall
# [...]

Read Full Post »

Setup firewall with IPTABLES in Ubuntu (part 1)

Playing with iptables in Ubuntu Terminal

I’ve been trying to figure out how to explain the iptables in a easy way. I’ve read so many articles about iptables but none of it mention to run iptables chain rules through command lines in Ubuntu console terminal.
I know the reason, [...]

Read Full Post »

List setup of CDMA and GSM phones for Ubuntu Wvdial

Default dialer below will be depend on your mobile type. In this setup, I use Nokia 6610 with CA42 cable. List of CDMA and GSM providers below are based in Indonesia only.
For example, your cureent GSM card is Simpati, then just type:
taufanlubis@zyrex:~$ sudo wvdial SIMPATI
 
 
[Dialer Defaults]
Init1 = [...]

Read Full Post »

Set Root Password on Ubuntu after first installation

You will not get setting password for Root during installation process in Ubuntu. You have to do it manually.
$sudo passwd root
Enter New Unix password: ________ (enter your root password)
Retype new unix password: _______ (retype your password)
passwd: password updated successfully
$

Read Full Post »

Need proctection for your Ubuntu?

There are a lot of choices you can use to protect your system. Just use standard installation command to install it.
For example, you if want to install Lokkit, just use apt-get install command. Make sure you have the ‘universe‘ componet enabled in your repository.
taufanlubis@zyrex:~$ sudo apt-get install [...]

Read Full Post »