Category: network

Wireguard on Lightsail gone Ship-Wrecked

For a long time now I run an AWS Lightsail VPS serving as a wireguard gateway to my home server. Since recently connecting to the Lightsail instance via wireguard is no longer possible.
When I took a look with SSH I got

$> sudo wg-quick up wg0
[#] ip link add wg0 type wireguard
RTNETLINK answers: Operation not supported
Unable to access interface: Protocol not supported
[#] ip link delete dev wg0
Cannot find device "wg0"

To be sure I updated all packages, but the problem still persisted.
The port used by wireguard had not changed and still was accessible according to the network settings of Lightsail.
What change in the Lightsail VPS or network settings could cause an issue like this? It literally just stopped working over night.

Installation and Configuration of MiniDLNA/ReadyMedia

This is a very brief article or rather a reminder to myself, about how to install MiniDLNA on Ubuntu Server 20.04. I always knew this piece of software by it’s old name MiniDLNA, but apparently it was renamed and is now called ReadyMedia. There don’t seem to be many changes below the hood though.

MiniDLNA is a light-weight media server using the DLNA protocol. Through MiniDLNA a library of media files is created which allows a user to very conveniently browse through the files and start audio and video playback. Most SmartTVs and Android phones support DLNA out of the box.

Connect Wireguard after Boot

It is sometimes desirable to bring a Wireguard interface up each time the system boots. Using wg-quick it is dead easy to create a service which takes care of the required steps. In case wg0 is already up and running, it must be taken down before the service can start successfully.

$> sudo systemctl enable wg-quick@wg0.service
$> sudo systemctl daemon-reload
$> sudo wg-quick down wg0
$> sudo systemctl start wg-quick@wg0


Make Samba Share Appear in Windows 10 Network View

Since Windows 10 version 1709 (“Fall Creators Update”) neither SMB1 nor NetBios device discovery is supported anymore.
Due to this change a Samba share which is hosted on a Linux machine may no longer show up in the Network view of Windows Explorer.
Although the Samba share can still be reached by it’s hostname or IP address (and share name) this is a slight inconvenience.

Luckily there is a small Python tool called wsdd which provides a Web Service Discovery (host) daemon. What follows is a short guide on how to install and use wsdd on Ubuntu Server 20.04 (works similar for other Debian based distributions).

Setting up Wireguard on Ubuntu

Wireguard is a modern VPN protocol allowing secure and confidential communication between a network of peers. Wireguard is based on the concept of private-public key cryptography and a number of other modern cryptographic algorithms. Have a look at the wireguard white paper for more details.

Wireguard Requirements

Since Linux kernel version 5.6 (late March 2020) wireguard is an integral part of the Linux kernel. That means Linux distributions using a kernel >= 5.6 do not need to install any additional packages in order to support wireguard.

How to set up NordVPN on Ubuntu

There are two ways to set up a VPN connection with NordVPN on Ubuntu. The first one is to add NordVPN’s package repository to the apt sources and then install the nordvpn client via a simple sudo apt install nordvpn. The second one is to install OpenVPN and configure it to use the servers of NordVPN.
This how-to was written for Ubuntu 18.04 LTS (Bionic Beaver).

Extracting MPEG2-TS from Wireshark capture file

When working with IP multicast streams it can sometimes be useful to convert a captured IP stream file to a corresponding MPEG2 transport stream (TS) file. Wireshark has a built-in capability to extract MPEG2-TS packets from the UDP packets of an IP multicast stream. This feature is somewhat hidden away in the menus and not obvious to find.

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