Package: ifupdown
Version: 0.8.19
Severity: normal
Dear Maintainer,
The following command:
/sbin/ifup -a --read-environment
tries to bring up some GRE tunnels on my system that are already up. Obviously,
this fails. One consequence of that is that the systemd "networking" unit is
always marked as failed, so systemd never thinks the network is actually up.
The relevant bits of the /etc/network/interfaces.d/* looks as follows:
auto tun-up-b_ak
iface tun-up-b_ak inet static
address 100.64.5.59
netmask 255.255.255.254
pre-up ip tunnel add $IFACE mode gre local 51.X.X.X remote 185.X.X.X
ttl 255
post-up ip link set $IFACE mtu 1280
post-down ip tunnel del $IFACE
iface tun-up-b_ak inet6 static
address 2a03:2260:0:ba::2/64
netmask 64
ifup itself shows the following:
$ sudo /sbin/ifup -a --read-environment -v
ifup: parsing file /etc/network/interfaces.d/ffrl_gre
ifup: parsing file /etc/network/interfaces.d/ffrl_gre~
ifup: parsing file /etc/network/interfaces.d/freifunk
ifup: parsing file /etc/network/interfaces.d/general
ifup: parsing file /etc/network/interfaces.d/inter_gw
/bin/run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/bridge
run-parts: executing /etc/network/if-pre-up.d/ethtool
ifup: configuring interface tun-up-b_ak=tun-up-b_ak (inet)
ip tunnel add $IFACE mode gre local 51.X.X.X remote 185.X.X.X ttl 255
add tunnel "gre0" failed: File exists
ifup: failed to bring up tun-up-b_ak
/bin/run-parts --exit-on-error --verbose /etc/network/if-up.d
run-parts: executing /etc/network/if-up.d/ethtool
run-parts: executing /etc/network/if-up.d/mountnfs
run-parts: executing /etc/network/if-up.d/openssh-server
run-parts: executing /etc/network/if-up.d/openvpn
run-parts: executing /etc/network/if-up.d/upstart
With exactly the same setup (literally -- this is all automatically deployed), I
do not get any errors on our jessie systems. Also the stretch system with a
slightly older kernel (4.9.0-3) is not affected. The broken machine has
4.9.0-4-amd64.
Kind regards,
Ralf
