Monthly Archives: February 2013

RCP100 Basic Router Configuration on Ubuntu 12.04

I do like the idea of an open-source software router, and I’ve tried several of them so far. Most open-source routers would concentrate on implementing the main IP routing protocols one by one. Administration features like CLI or SNMP seem to get less attention. There is little or no support for integrated Access Control Lists, NTP, DHCP or DNS functionality. This is in sharp contrast with the commercial routers where administration and network management are first class citizens.

RCP100 seems to break the tradition. It has a Cisco-like command line interface (CLI), and all the regular administration and management protocols. Starting with version 0.99 it also features a simple and intuitive web interface, making the router accessible to less sophisticated users and beginner administrators.

In this article I will set up a basic RCP100 IP router on a Ubuntu 12.04 computer using the web interface. This means there will be lots of pictures and no CLI commands. Networking experts will definitely get bored.

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How to send emails from command line

SendEmail is a lightweight command line SMTP agent. It was designed to be easily integrated in bash scripts, Perl programs etc. The program is in fact a Perl script, and it is distributed under GPL license. This is how you can send emails from command line using SendEmail and a regular gmail or yahoo account.

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Ubuntu Cleanup

I’ve recently installed Ubuntu 12.04 Long Term Support (LTS). The main advantage of a LTS distribution is that once you clean it up, it stays like that for two years.


First step is to switch your desktop to LXDE, unless you like Unity or Gnome the Third. The recommended way is to install Lubuntu, in my case I will install LXDE on top of regular Unity. If you already have regular Ubuntu installed, it would be too much trouble to start downloading and installing everything. Also keep in mind that Lubuntu is not a LTS release, and the applications installed are different, for example Goolge Chromium instead of Mozilla Firefox, or Gnumeric instead of LibreOffice Calc. LXDE is such a small desktop component, it might be a better idea to chose your distro based on the applications it provides and switch the default desktop environment to LXDE.

$ sudo apt-get install lxde

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ezchroot is a small script to chroot into OpenVZ containers. Once inside, you can update or modify the container software. The operation is similar to ezlxc.


if [ $# -gt 0 ]; then
	echo "Usage: ezchroot directory"
	exit 1

cp -L /etc/resolv.conf $1/etc/.
mount -t proc none $1/proc
mount --rbind /dev $1/dev
mount --rbind /sys $1/sys

echo "entering chroot directory"
env NAME=chroot chroot $1 /bin/bash
umount $1/proc
umount $1/dev
umount $1/sys
echo "chroot exited"