HOWTO: Install Archey on Ubuntu

Introduction

Archey is a tool written in Python that allows users to preview system information along with your Linux distribution logo on the terminal. Another similar tool is screenFetch.

Installation

Firstly we need to install the necessary dependencies:

$ sudo apt-get install scrot lsb-release

Download Archey and install:

$ wget https://github.com/downloads/djmelik/archey/archey-0.2.8.deb
$ sudo dpkg -i archey-0.2.8.deb

Usage

Run command:

$ archey

you will get this for ubuntu

If you want to start Archey automatically once you launch the terminal, add this to the end of your .bashrc

# Archey
archey

Save and open a new terminal to test it.

 

HOWTO: Prevent DNS cache pollution

Let us try to get the ip of twitter from the default port (53) of OpenDNS:

# dig @208.67.222.222 twitter.com
; <<>> DiG 9.9.1-P3 <<>> @208.67.222.222 -p 53 twitter.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28025
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;twitter.com. IN A

;; ANSWER SECTION:
twitter.com. 300 IN A 37.61.54.158

;; Query time: 8 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: Wed Sep 10 07:51:57 2014
;; MSG SIZE rcvd: 56

Obviously 37.61.54.158 is not what we want.

Let us try with port 5353 and  443:

# dig @208.67.222.222 -p 5353 twitter.com

; <<>> DiG 9.9.1-P3 <<>> @208.67.222.222 -p 5353 twitter.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64372
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;twitter.com. IN A

;; ANSWER SECTION:
twitter.com. 15 IN A 199.59.148.82
twitter.com. 15 IN A 199.59.149.230
twitter.com. 15 IN A 199.59.150.7
twitter.com. 15 IN A 199.59.149.198

;; Query time: 85 msec
;; SERVER: 208.67.222.222#5353(208.67.222.222)
;; WHEN: Wed Sep 10 08:03:49 2014
;; MSG SIZE rcvd: 104

# dig @208.67.222.222 -p 443 twitter.com

; <<>> DiG 9.9.1-P3 <<>> @208.67.222.222 -p 443 twitter.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2939
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;twitter.com. IN A

;; ANSWER SECTION:
twitter.com. 4 IN A 199.59.148.10
twitter.com. 4 IN A 199.59.149.198
twitter.com. 4 IN A 199.59.148.82
twitter.com. 4 IN A 199.59.150.7

;; Query time: 294 msec
;; SERVER: 208.67.222.222#443(208.67.222.222)
;; WHEN: Wed Sep 10 08:04:53 2014
;; MSG SIZE rcvd: 104

Now we got it !!!

In OpenWrt, edit /etc/config/dhcp, change dnsmasq section

config dnsmasq
    option domainneeded '1'
    option boguspriv '1'
    option localise_queries '1'
    option rebind_protection '1'
    option rebind_localhost '1'
    option local '/lan/'
    option domain 'lan'
    option expandhosts '1'
    option authoritative '1'
    option readethers '1'
    option leasefile '/tmp/dhcp.leases'
#   option resolvfile '/tmp/resolv.conf.auto'
    option noresolv 1
    list server '208.67.222.222#5353'
    list server '/pool.ntp.org/208.67.222.222'