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Ubiquiti UniFi Access Points

In our three-story concrete house our old WiFi situation wasn’t optimal to say the least. I used to have an all-in-one router/switch/wifi thing which worked reasonably well on the first floor, but any device on the second or let alone

jansipke 2019-07-302021-09-12 Networking No Comments Read more

Test TCP connection without telnet or nc

Sometimes you need to test if a network connection works without actually using the intended client program. Normally you would use a tool like telnet or nc to do this, e.g. $ telnet www.google.com 80 Trying 172.217.20.68… Connected to www.google.com.

jansipke 2017-06-122021-09-12 Networking 9 Comments Read more

Setting Ubuntu hostname as offered by DHCP server

A DHCP server might be setup in such a way that it offers a hostname to its clients. By default, the Ubuntu hostname is set during installation and it disregards the one in the DHCP lease, but we can change

jansipke 2013-08-222021-09-12 Networking 1 Comment Read more

Android mobile network settings for Vodafone business in the Netherlands

The following settings are needed for using the Vodafone business mobile network in the Netherlands with an Android phone: Name Choose one yourself, e.g. Vodafone Business Android APN office.vodafone.nl Proxy not set Port not set Username vodafone Password vodafone Server

jansipke 2013-01-012021-09-12 Networking No Comments Read more

Using the pipe backend in PowerDNS

PowerDNS is a Domain Name System (DNS) server with a lot of different possible backends, such as MySQL, PostgreSQL, LDAP, BIND zone files and a Unix pipe backend. In this article we will look at the pipe backend which is

jansipke 2012-10-122021-09-12 Networking No Comments Read more

Ubuntu 12.04 network configuration

The network configuration of Ubuntu 12.04 has changed a bit, at least the server edition, haven’t checked the desktop version. The file /etc/network/interfaces contains a few directives that tell Ubuntu how to configure the network interfaces. There are basically two

jansipke 2012-05-272021-09-12 Networking 4 Comments Read more

Programming the Arduino ethernet shield

The Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It features an IDE that allows you to program the Arduino using a standard USB cable. Several shields exist that extend the functionality of the

jansipke 2010-09-082021-09-12 Hardware, Networking, Programming 3 Comments Read more

Using XenServer in a routed IP network

Hetzner is a hosting company in Germany where you can rent dedicated root servers per month. Using their KVM-over-IP setup, it is possible to install operating systems that are not available by default, such as XenServer by Citrix. With the

jansipke 2010-03-282021-09-12 Cloud Computing, Networking 17 Comments Read more

Enable SSL in Apache

To enable SSL in Apache, we need to perform some steps. We start by generating a key for our server: openssl genrsa -out server.key 4096 Then we generate a Certificate Signing Request (CSR) based on this key: openssl req -new

jansipke 2009-10-272021-09-12 Networking No Comments Read more

Configuring Postfix to use a smarthost

Some companies and ISP’s do not allow you to send mail from your machine directly, but force you to use their smarthost. In the Postfix SMTP server we can accomplish this by editing the file /etc/postfix/main.cf: relayhost = smarthost.example.org We

jansipke 2009-05-142021-09-12 Networking No Comments Read more
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