IPv6 tunnel broker setup - ArchWiki

# IPv6 tunnel broker setup

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Hurricane Electric offers a free tunnel broker service that is relatively painless to use under Arch if you wish to add IPv6 connectivity to an IPv4-only host.

## Registering for a tunnel

It is not that hard to do. Feel free to fill in the directions here if something seems tricky, but otherwise just go the tunnel broker site and complete the registration.

## Setting up Hurricane Electric tunnel

Create the following systemd unit, replacing bold text with the IP addresses you got from HE:

Note: If you are behind a NAT (typical home router setup), use your local IPv4 address for `client_IPv4_address`, e.g. `192.168.0.2`.

    /etc/systemd/system/he-ipv6.service

    [Unit]
    Description=he.net IPv6 tunnel
    After=network.target

    [Service]
    Type=oneshot
    RemainAfterExit=yes
    ExecStart=/usr/bin/ip tunnel add he-ipv6 mode sit remote server_IPv4_address local client_IPv4_address ttl 255
    ExecStart=/usr/bin/ip link set he-ipv6 up mtu 1480
    ExecStart=/usr/bin/ip addr add client_IPv6_address dev he-ipv6
    ExecStart=/usr/bin/ip -6 route add ::/0 dev he-ipv6
    ExecStop=/usr/bin/ip -6 route del ::/0 dev he-ipv6
    ExecStop=/usr/bin/ip link set he-ipv6 down
    ExecStop=/usr/bin/ip tunnel del he-ipv6

    [Install]
    WantedBy=multi-user.target

Then start/enable `he-ipv6.service`.

## systemd-networkd

If systemd-networkd handles your network connections, it's probably a better idea to let it handle tunnel broker too (instead of using a `.service` file).

    /etc/systemd/network/he-tunnel.netdev

    [Match]

    [NetDev]
    Name=he-ipv6
    Kind=sit
    MTUBytes=1480

    [Tunnel]
    Local=<local IPv4>
    Remote=<tunnel endpoint>
    TTL=255

    /etc/systemd/network/he-tunnel.network

    [Match]
    Name=he-ipv6

    [Network]
    Address=<local IPv6>
    Gateway=<IPv6 gateway>
    DNS=2001:4860:4860::8888
    DNS=2001:4860:4860::8844

And, add this line to `[Network]` section of your default Internet connection `.network` file:

    Tunnel=he-ipv6

## Using the tunneling with dynamic IPv4 IP

### Updating via cronjob

The simplest way of using tunelling with a dynamic IPv4 IP is to set up a cronjob that is going to periodically update your current address. The example URL and an Update Key can be found in the Advanced tab of the Tunnel Details page.

To check if the update works, run the following command (replace `USERNAME`, `UPDATEKEY` and `TUNNELID` by the details of your account and tunnel):

    $ wget -O - https://USERNAME:UPDATEKEY@ipv4.tunnelbroker.net/nic/update?hostname=TUNNELID

If it works, create a cronjob by opening `crontab -e` and adding a new line:

    */10 * * * * wget -q -O /dev/null https://USERNAME:UPDATEKEY@ipv4.tunnelbroker.net/nic/update?hostname=TUNNELID

### Updating via ddclient

Alternatively this can be configured by installing ddclient and configuring `/etc/ddclient.conf`:

    protocol=dyndns2
    use=web
    web=checkip.dns.he.net
    server=ipv4.tunnelbroker.net
    ssl=yes
    login=USERNAME
    password=UPDATEKEY
    TUNNELID

And finally start/enable `ddclient.service`.

Category:

- Networking