This document will guide you through the process of setting up your online.net network addresses, DNS servers and rDNS records. For IPv4 we will use systemd-networkd (part of systemd) and odhcp6c (OpenWrt embedded DHCPv6-client) together with iproute2 for IPv6. For DNS we'll use systemd-resolved.
systemd is the default init process on Arch Linux, Debian GNU/Linux, Fedora, Ubuntu and more. iproute2 is also preinstalled there. So, if you're using a distribution that uses systemd, this tutorial should work for you. If you're using Gentoo Linux first make sure that you're using systemd.
First the easy part: IPv4 DHCP
Get the name of your public and private network device by comparing the IPv4 addresses with those in the webinterface:
$ ip a
For the following example I'll use enp0s20f0 as the name for the public network device and enp0s20f1 for my private network device.
Switch to your systemd-networkd .network files directory and list its contents:
$ cd /etc/systemd/network && ls
If you already have existing .network files in there, compare their contents with those of the files below and restart systemd-networkd (sudo systemctl restart systemd-networkd) if you changed something.
If you don't have an existing configuration, create 2 files with the following contents:
[Match]
Name=enp0s20f0
[Network]
DHCP=ipv4
[Match]
Name=enp0s20f1
[Network]
DHCP=yes
It's important that their names end with .network, otherwhise they'll be ignored by systemd-networkd.
Now start systemd-networkd and enable it to run on startup:
$ sudo systemctl enable --now systemd-networkd
You can check the status with sudo systemctl status systemd-networkd.
The private network configuration for enp0s20f1 above will also enable DHCPv6 for your private network. But because systemd-networkd doesn't yet support DHCPv6 prefix delegation (IA_PD) we need another DHCPv6 client for your public network. As of version 237 systemd supports IA_PD, but apparently networkd isn't (yet) suitable for this usecase. And as dhcpcd and dhclient didn't seem to work permanently I tested odhcp6c and it runs perfectly.
If you used different tools for your network connection previously you can now stop and/or uninstall them (the online.net Arch Linux Image uses NetworkManager by default).
Install the AUR package.
Install the experimental package from the repos.
Install it from the openwrt overlay.
Install odhcp6c by cloning its git repo and compiling it.
First make sure you have all needed tools installed:
- make
- cmake
- git
Then cd to the directory where you want to clone odhcp6c to (e.g. your home directory) and proceed with the following commands:
$ git clone https://github.com/openwrt/odhcp6c
$ cd odhcp6c
$ cmake .
$ make
$ sudo make install
Start with looking up your IPv6 and your DUID in the webinterface.
Now add your IPv6 to the system:
$ sudo ip -6 a a <your address>/<your subnet size> dev <your public network device>
For example:
$ sudo ip -6 a a 2001:bc8:f34e::/48 dev enp0s20f0
Then log in as root (sudo -i) and start odhcp6c with the following command:
# odhcp6c -dP <your subnet size> -c <your duid> <your public network device>
For example:
# odhcp6c -dP 48 -c 10:f0:55:10:ae:87:45:19:05:97 enp0s20f0
Now your IPv6 should be set up and you should be able to use your public IPv6. You can easily test it by pinging a Google DNS Server with:
$ ping 2001:4860:4860::8888
Note: If you're using the default ping tool from gentoo you have to use ping6 instead.
For automatic configuration on boot you can create a systemd unit.
To do this create a file that ends with .service (<your unit name>.service, for example: dhcpv6.service) in the directory /etc/systemd/system with the following content:
[Unit]
Description=IPv6 Configuration with the OpenWrt embedded DHCPv6-client
[Service]
Type=simple
ExecStartPre=/usr/bin/ip -6 a a <your ipv6>/<your subnet size> dev <your public network device>
ExecStart=/usr/bin/odhcp6c -vP <your subnet size> -c <your duid> <your public network device>
ExecStopPost=/usr/bin/ip -6 a d <your ipv6>/<your subnet size> dev <your public network device>
[Install]
WantedBy=multi-user.target
I've added the option -v to odhcp6c in this file so that you have a log if something doesn't work. Also I removed -d cause in this case it's a subprocess of systemd anyways, so there's no need to daemonize it.
Now enable your unit with:
$ sudo systemctl enable <your unit name>.service
The next time you reboot your IPv6 will be automatically configured.
The following steps are optional if you used an online.net install image. In this case your name resolution is already configured in /etc/resolv.conf, but you can still change it and use systemd-resolved instead.
Edit the configuration file /etc/systemd/resolved.conf and make sure it contains the following lines:
[Resolve]
DNS=2001:bc8:401::3 2001:bc8:1::16 62.210.16.6 62.210.16.7
FallbackDNS=2001:4860:4860::8888 2001:4860:4860::8844 8.8.8.8 8.8.4.4
Domains=online.net
The servers used in the example above are the online.net dedibox DNS cache servers and the Google DNS servers as fallback.
Then start/restart the service with:
$ sudo systemctl restart systemd-resolved
Also don't forget to link the /etc/resolv.conf to the resolv.conf generated by systemd-resolved, which defines systemd-resolved as nameserver to send DNS requests to (this will overwrite your old resolv.conf):
$ sudo ln -srf /usr/lib/systemd/resolv.conf /etc/resolv.conf
Note: On Gentoo Linux the link target is /lib/systemd/resolv.conf since systemd-235.
You can set your rDNSv4 record in your webinterface.
Since it isn't possible to set reverse DNSv6 entries via the webinterface, you need to delegate your subnet to other nameservers, where you can set your PTR record. You can either set up two nameservers on your own or use a free dns service like afraid.org.
If you decide to use afraid.org, start by delegating your IPv6 Subnet to the afraid.org nameservers (ns{1,2,3,4}.afraid.org). After creating your account there, select IPv6 Reverse in the menu. Continue by adding your subnet and the IP address of your server afterwards.
And that's it, you're done! Your reverse should resolve after a few minutes.
If you have any questions feel free to write a comment. Feedback is also highly appreciated!
any chance that this also works on ubuntu 18.04 - on online.net? ipv6 slaac