Debian/Ubuntu Tips and Tricks

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Debian/Ubuntu Tips and Tricks

Archive for the 'Networking' Category

How Tos related to networking from accessing remote hosts, configuring a service or administration.

How-To: Virtual emails accounts with Postfix and Dovecot — page 2

Posted by chantra on 18th January 2009

This entry is part 2 of 3 in the series How-To: Virtual emails accounts with Postfix and Dovecot

4. Configuring Postfix

4.1. main.cf and master.cf

Your postfix main.cf file should look like:

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Posted in Administration, HowTo, Networking | 1 Comment »

How-To: Virtual emails accounts with Postfix and Dovecot

Posted by chantra on 18th January 2009

This entry is part 1 of 3 in the series 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.
Postfix will be our SMTP server, Dovecot will be handling IMAP (optionally one could configure POP3 also) so that users can retrieve their email.

Another tutorial will cover SPAM fighting using DSPAM based on this implementation (yet to be done).

This tutorial was done on Debian Etch using postfix 2.3.8-2etch4 and 1.0.rc15-2etch4.

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Posted in Administration, HowTo, Networking | 2 Comments »

How-To: Apache2 authentication using MySQL backend — page 2

Posted by chantra on 17th December 2008

This entry is part 1 of 2 in the series How-To: Apache2 authentication using MySQL backend

3. Creating users

Here we will be using sha1 password. To create a password, you can use the following command:

# echo -n 'password' | sha1sum
5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8 -

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Posted in Administration, HowTo, HTTP, Networking, System | 5 Comments »

How-To: Apache2 authentication using MySQL backend

Posted by chantra on 17th December 2008

This entry is part 1 of 2 in the series 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.

To achieve this we will use Apache2 and its auth_mysql module.

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Posted in Administration, HowTo, HTTP, Networking, System | 1 Comment »

How-To: Redirecting network traffic to a new IP using IPtables

Posted by chantra on 6th December 2008

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 people are using the IP address instead of the domain name....

By using iptables and its masquerade feature, it is possible to forward all traffic to the old server to the new IP.

This tutorial will show which command lines are required to make this possible.

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Posted in Administration, HowTo, Networking | 13 Comments »

How-To: Setting up BGP on Vyatta — page 3 — Setting BGP

Posted by chantra on 2nd November 2008

This entry is part 3 of 3 in the series How-To: Setting up BGP on Vyatta

3. Setting BGP

As told earlier on, vyatta-bgp1 will advertise AS 1 with network 1.1.1.0/24 to its neighbor vyatta-bgp2 handling AS 2
and
vyatta-bgp2 will advertise AS 2 with network 2.2.2.0/24 to its neighbor vyatta-bgp1 handling AS 1

They will use a common password for this communication, which is BGPtutorial.

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How-To: Setting up BGP on Vyatta — page 2 — Network interfaces

Posted by chantra on 1st November 2008

This entry is part 2 of 3 in the series How-To: Setting up BGP on Vyatta

2. Setting the network interfaces

During this part, we are going to set up the 2 Border Gateway routers'network interfaces. In vyatta world, you need to enter the interactive configuration shell by typing:

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How-To: Setting up BGP on Vyatta

Posted by chantra on 1st November 2008

This entry is part 1 of 3 in the series 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 like 800M to be installed and is based on Debian. On the top of that, it offers configuration wrappers to facilitate service settings.

This tutorial will explain how to set up 2 Border Gateway Protocol (BGP) boxes to route the traffic from one Autonomous System (AS) to the other using Vyatta.
Vyatta Community Edition 4.1.4 was used during this set up.

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How-To: Set up a LAN gateway with DHCP, Dynamic DNS and iptables on Debian Etch — page 4 — IPtables

Posted by chantra on 29th June 2008

3. Forwarding Internet traffic with IPtables

IPtables is both used to act as a firewall, but it is also the one passing packets from one network to another.

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Posted in Administration, HowTo, Networking, System | 7 Comments »

How-To: Set up a LAN gateway with DHCP, Dynamic DNS and iptables on Debian Etch — page 3 — DHCP server

Posted by chantra on 29th June 2008

2. DHCP server

In order to provide an IP address to the other machines in the network, we need to use a DHCP server.
This DHCP server will provide the host with all the information needed to connect to any other accessible host. i.e, the IP, netmask, gateway, domain name server.
The DHCP server will also update bind with a nt set of hostname and IP when the client is requesting a specific hostname.

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