How-To: Prevent SPAM with Apache’s mod security
WordPress is a great piece of software to run a blog, it is flexible, has tons of plugins are developed for it and updates are really easy to do. To fight sp...
Networking
How-To: Fight SPAM with Postfix RBL
Spam, spam everywhere! If you are hosting your own mail server, fighting spam can become tricky. Antispam solutions do catch a fair amount of them, but still...
How-To: WiFi roaming with wpa-supplicant
wpa_supplicant can be used as a roaming daemon so you can get your system to automatically connect to different network as you are going from one location to...
How-To: find which program consumes your bandwidth with nethogs
Let’s continue the network monitoring serie with yet another use case…. the “What program is using my bandwidth?” problem while not imposible to solve, still...
How-To: monitor network bandwidth usage with vnstat
There is many tools out there that help in monitoring network usage, collect statistics and generate graphs so we can view what happened at a given date/time...
How-To: OpenVPN on Debian Squeeze with Username/Password authentication
OpenVPN is a SSL based VPN software that runs on most OS. It is simple to install and run.
How-To: Set up a L2TP over IPSec VPN using a Radius backend — page 3
In the previous part, we have configured XL2TP
How-To: Set up a L2TP over IPSec VPN using a Radius backend — page 2
We have now configured IPSec, let’s carry on with the next step.
How-To: Set up a L2TP over IPSec VPN using a Radius backend
Even though I pretty like OpenVPN, there is still some devices that might not support the TUN/TAP driver needed by OpenVPN.
How-To: Network-Manager-OpenVPN overwrites default route
I was trying network-manager-openvpn plugin today on Lucid, I could import my configuration, DNS was set up correctly upon connection/disconnection, route im...
How-To: Virtual emails accounts with Postfix and Dovecot — page 3
Following Postfix configuration, it is now time to configure Dovecot.
How-To: Virtual emails accounts with Postfix and Dovecot — page 2
We have set up the database in the first part. Now let’s go ahead and configure our email server to use that database.
How-To: Virtual emails accounts with Postfix and Dovecot
This tutorial will explain how to run a mail server with virtual domains and users using a MySQL backend to store email informations.
How-To: Apache2 authentication using MySQL backend — page 2
In the first part, we have set up our database, let now add some user to authenticate.
How-To: Apache2 authentication using MySQL backend
this tutorial will explain how to use a MySQL backend in order to authentication users against your Apache website.
How-To: Redirecting network traffic to a new IP using IPtables
While doing a server migration, it happens that some traffic still go to the old machine because the DNS servers are not yet synced or simply because some pe...
How-To: Setting up BGP on Vyatta — page 3 — Setting BGP
We have set up our network, now let’s get BGP rolling.
How-To: Setting up BGP on Vyatta — page 2 — Network interfaces
Now that we have defined what we will be setting up, let’s build this up.
How-To: Setting up BGP on Vyatta
Vyatta is a Linux based distro that ease the set up of VPN, Routers, antivirus…. It has a really small footprint on your system as it only requires something...
How-To: Set up a LAN gateway with DHCP, Dynamic DNS and iptables on Debian Etch — page 4 — IPtables
We now provide IPs to the hosts in our LAN with our newly installed DHCP server. Now we need to pass their network packets around.
How-To: Set up a LAN gateway with DHCP, Dynamic DNS and iptables on Debian Etch — page 3 — DHCP server
Now that we have configured our DNS server, we need to distribute IPs to the machines in our LAN.
How-To: Set up a LAN gateway with DHCP, Dynamic DNS and iptables on Debian Etch — page 2 — DNS server
1. DNS server
How-To: Set up a LAN gateway with DHCP, Dynamic DNS and iptables on Debian Etch
Linux is a perfect platform to act as a router/gateway.
How-To: copy files over the network and preserve file permissions and informations with ssh and rsync
When copying files over the network, the files informations can be modified.
How-To: Intel Wireless 4965 AGN with Ad-Hoc network + WEP
The Intel wireless card 4965 AGN does not work properly on ad-hoc networks since hardy and kernel 2.6.24 or around, network-manager can’t get it to use the m...
How-To: Connect to a Cisco VPN with vpnc
This tutorial will show how-to connect to a Cisco VPN Concentrator using vpnc.
How-To: Unattended Ubuntu Deployment over Network — page 5 — Preseed File
5. Preseed: Installation automation:
How-To: Unattended Ubuntu Deployment over Network — page 2 — DHCP server
For the purpose of this tutorial, I decided to choose dnsmasq to act as a DNS/DHCP server. The reason behind this is that dnsmasq is simple to configure and ...
How-To: Unattended Ubuntu Deployment over Network
there is many ways of installing Linux. Nowadays, the most common one is probably by using a CD. Download the CD, stick it in your CDRom drive and let’s roll...
How-To: Monitor your servers with SNMP and Cacti — page 3
3. Adding new devices to cacti
How-To: Monitor your servers with SNMP and Cacti — page 2
Now that we have our snmp server up and running, we are going to install cacti to manage the snmp server in our network.
How-To: Monitor your servers with SNMP and Cacti
SNMP (Simple Network Management Protocol) is a protocol for managing networks. Each managed entity in the network will run an snmp server (snmpd) which is go...
How-To: FTP Virtual Host with ProFTPD and MySQL — page 2
4. Configure ProFTPd
How-To: FTP Virtual Host with ProFTPD and MySQL
Using ProFTPD and its SQL module for MySQL, it is possible to give FTP access to non system users.
How-To set up a LDAP server and its clients — page 2
2. Configuring the clients
How-To set up a LDAP server and its clients
LDAP (Lightweight Directory Access Protocol) allows central user, group, domain….. authentication, information storage …
Samba: How to share files for your LAN without user/password
This tutorial will show how to set samba to allow read-only file sharing for your LAN computers as guest (without be prompted for a password).
Secure your SSH server with Public/Private key authentification — page 3
4. Disabling Authentication by password
Secure your SSH server with Public/Private key authentification — page 2
2. Adding the public key to the authorized key
Secure your SSH server with Public/Private key authentification
Open SSH is the most widely used SSH server on Linux. Using SSH, one can connect to a remote host and gain a shell access on it in a secure manner as all tra...
Iptables: How-to Share your internet connection — page 4
4. Using iptables’script
Iptables: How-to Share your internet connection — page 3
3.3. Defining custom chains
Iptables: How-to Share your internet connection — page 2
3. Iptables Script
Iptables: How-to Share your internet connection
iptables is a command line tool which allow system administrators to configure Linux packet filtering ruleset.
How-To: Monitoring a Server with Munin — page 2
2. Setting up apache
How-To: Monitoring a Server with Munin
Munin is a simple to configure tool that make real nice graph about your server status. It can actually deal with almost any aspect of your server (load aver...
Postfix and Postgrey: A proactive approach to spam filtering — page 2
4. Tweaking up Postgrey
Postfix and Postgrey: A proactive approach to spam filtering
Greylisting is yet another way for preventing your mailbox getting full of spam. A famous spam fighter software is spamassassin which filter emails. Greylist...
Postfix and Spamassassin: How to filter spam — page 2
3. Make Postfix call Spamassassin
Postfix and Spamassassin: How to filter spam
Postfix is a widely used mail transport agent (MTA) used on many popular Unix/Linux systems. Nowadays, networks are overwhelmed by SPAM mail, fortunately, th...
Ssh Port Forwarding and “channel 3: open failed: connect failed: Connection refused”
In relation to a tutorial I previously made on how-to connect to a remote mysql server by forwarding port with ssh, I found out that some distributions like ...
How-To: Setting up a DNS zone with Bind9 — page 2
3. Setting up Reverse Name Resolution
How-To: Setting up a DNS zone with Bind9
Bind is a well known Unix name server, it is a powerfull piece of software which is used by the majority of nameservers.
How To: Optimize MySQL response time
High loaded website can get slow to respond when a lot of different visitors visit sites querying the same mysql database server, making it slow to respond.
nload, a network traffic analyser
nload is a ncurse based network traffic analyser. Being a ncurse based tools, you do not need to start X in order to use that software which is necessary whe...
How-To smbfs: smbmnt must be installed suid root
Quite often, when using program such as smb4k, I encountered the following error:
How To: Exim4 Virtual Host on Debian Etch
Well, since I reinstalled a Debian, I decided to make an article on Exim4, as a complement to Postfix and Virtual Host.
How-To: Postfix and Virtual Hosts
Postfix comes as the default mail server under ubuntu. By default, it is set such as it can basically send system notice mail to the user you predefined duri...
Mounting a fuse Filesystem from /etc/fstab
Earlier on, I showed how-to mount a remote filesystem with fuse, using a remote partition accessible by SSH. Since version version 2.4.0, it is possible to u...
How To: editing subtitles with subtitleeditor
In a previous article, I introduced gsubedit, a GNOME Subtitle Editor for linux using GTK. It was the best subtitles editor I’d ever found for linux.
SSH and Port Forwarding or How to get through a firewall
In this article I’m going to show you how you can use SSH Port Forwarding to access a service a firewall might be blocking.
wget, wput or how to easily download-upload over internet
Most unix administrator might know wget, a HTTP, HTTPS and FTP client developped by the GNU project. Using that tool, you can easily download HTTP page but a...
How To: Mount a remote filesystem using SSH, SSHFS and FUSE
SSH is a protocol to securely connect to a remote host. In previous article we have seen how-to connect to a remote database through a secured tunnel.
How To: Connect to a remote mysql server using mysqlcc and ssh tunneling part 2
In a previous article we saw how to connect to a remote mysql server running both ssh and mysql.
How-To IPW2200: Getting Intel Pro Wireless 2200 BG to work on debian/ubuntu
A lot of laptop computers using Centrino processor use the Intel Pro Wireless 2200 BG wireless interface, also known as ipw2200.
Using Multiple network device to connect to the internet
It happens sometimes that you get more than one connection to the internet. Also it might not be usefull in most of the cases, there are few cases when it ge...
Virtual Hosting using Apache 2 on a linux machine
Virtual Hosting allow web servers to host more than one website on a sing machine. This is how sharing hosting works. I become pretty handy as well while dev...
How To Connect to a remote mysql server using mysqlcc and ssh tunneling.
This will explain how to connect to a remote mysql server only allowing connections from locahost, from your computer in a secure way as it is being done thr...