After upgrading my Ubuntu 16.04 LTS virtual server the network didn't come up any more and server was unreachable.
My provider had to uncomment the line
/usr/sbin/fanctl net "$MODE" "$IFACE"
to get things running again. Is this a known bug?
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The program you mentioned is packaged as
ubuntu-fan. It was a dependency of Docker:
$ apt-cache rdepends ubuntu-fan ubuntu-fan Reverse Depends: docker.io docker.io
FAN is an IP over IP tunnel protocol which does network range remapping. This wiki page seems to be related.
This package has the following files:
$ apt-file list ubuntu-fan ubuntu-fan: /etc/NetworkManager/conf.d/10-ubuntu-fan.conf ubuntu-fan: /etc/default/ubuntu-fan ubuntu-fan: /etc/dnsmasq.d/ubuntu-fan ubuntu-fan: /etc/init.d/ubuntu-fan ubuntu-fan: /etc/init/ubuntu-fan.conf ubuntu-fan: /etc/network/if-down.d/ubuntu-fan ubuntu-fan: /etc/network/if-post-down.d/ubuntu-fan ubuntu-fan: /etc/network/if-up.d/ubuntu-fan # <<<<< ubuntu-fan: /lib/systemd/system/ubuntu-fan.service ubuntu-fan: /usr/lib/ubuntu-fan/fan-net ubuntu-fan: /usr/sbin/fanatic ubuntu-fan: /usr/sbin/fanctl ubuntu-fan: /usr/share/doc/ubuntu-fan/README ubuntu-fan: /usr/share/doc/ubuntu-fan/changelog.gz ubuntu-fan: /usr/share/doc/ubuntu-fan/copyright ubuntu-fan: /usr/share/man/man8/fanatic.8.gz ubuntu-fan: /usr/share/man/man8/fanctl.8.gz ubuntu-fan: /var/lib/ubuntu-fan/config/README
The file /etc/network/if-up.d/ubuntu-fan should be installed by default. It may be accidentally removed. You may want to purge this package and reinstall it back.