This configures an IPv6 tunnel via systemd.

Recommended for Hurricane Electric / Tunnel Broker only.

This requires a configuration file ending in .conf under /etc/tunnelbroker/ matching the form of tunnel.conf.example.

install -m 644 -t /etc/systemd/system/ service/ipv6-tunnel@.service
install -m 744 -Dt /etc/tunnelbroker/ tunnel.sh

Assuming the configuration file is named he.conf, start the service with systemctl start ipv6-tunnel@he.service.

For hacking at the script, something like sudo bash -c "source he.conf; ./tunnel.sh up" works well after adding exports to he.conf.