Infrastructure & Networking on Pablo Seminario

Notes about Android and IPsec on Linux

Sat, 23 Apr 2016 21:35:00 +0000

Here’s some personal notes about the excellent Jeff Sharkey’s article Deploying a pure-IPsec PKI VPN server for Android devices

My setup is a little bit different to that of Jeff, I have a 1Gbps fiber plan, a Linux server natted behind my ISP’s router and my IPsec VPN server is running on a Linux container (LXC), so this container doesn’t have a public IP address. The OS used in all the servers is Ubuntu Trusty 14.04. On the VPN client side I’m using Android 6.0 Mashmallow.

DNS resolution for LXC in Ubuntu 14.04

Sun, 27 Jul 2014 15:28:00 +0000

Working with LXC (Linux containers) in Ubuntu is very easy but by default you need to know the IP address of new containers to connect to services (ssh, database, webserver, etc.) running on them.

With some minor configuration you can connect to your containers using a domain name like that

 terminal
 bash
 
$ sudo lxc-create --name container1
$ sudo lxc-start --name container1 --daemon
$ ssh ubuntu@container1.lxc

In Ubuntu 14.04 Trusty Tahr, lxc-create use by default the Ubuntu template and it will create a user called ubuntu, to change it take a look at the template options with lxc-create -t ubuntu -h.

World IPv6 day

Wed, 06 Jun 2012 21:53:00 +0000

To celebrate the world IPv6 day I decided to activate IPv6 on this blog. Now you can visit my site with native IPv6 connectivity.

If you want to know more about IPv6 you can start reading this overview.

Installing Solr on Debian 6.0

Tue, 22 Feb 2011 19:29:00 +0000

Update: this is an old blog post, Solr is now included in Debian since 7.0, it can be installed through apt-get by calling apt-get install solr-tomcat.

Recently I’ve been working on a Django project that uses the Haystack search API and the Solr search engine to perform full text searching on indexed data.

This project was initially deployed on a Debian 5.0 (Lenny) server with some issues with Tomcat, but using the latest stable release of Debian (code named Squeeze) install Tomcat 6 and Solr is very easy.

ext4 support in Ubuntu Intrepid 8.10

Wed, 01 Jul 2009 01:34:00 +0000

This is just a simple tip to use ext4 filesystems in Ubuntu Intrepid Ibex 8.10. On Ubuntu Jaunty ext4 filesystems is fully supported but in Intrepid was on development. To use it we must load the module ext4dev

 terminal
 bash
 
sudo modprobe ext4dev

to check the filesystems supported by the kernel we can do

 terminal
 bash
 
cat /proc/filesystems

there should be a line with ext4dev. Now, if we try to mount a formatted partition as ext4, we will see that it’s not possible

Instalando una TDM400P sobre Etch

Wed, 22 Nov 2006 12:23:00 +0000

Introducción

Para que Asterisk pueda hacer uso de la red telefónica conmutada (PSTN) es necesario contar con una interfaz, la misma la proveen los módulos de hardware FXS o FXO, que permiten la interconexión directamente a teléfonos o a las líneas telefónicas. En mi caso tengo una TDM400P que tiene integrados dos módulos FXO y dos módulos FXS. Todo esto lo haremos funcionar sobre un Debian GNU/Linux Etch con kernel 2.6.17.