Networking with 'allow-hotplug' had broken after upgrading systemd 215-17+deb8u5 up to +deb8u6

[Dmitry Sidorov <sidorov.slomotv@gmail.com>]

Hello.

/etc/network/interfaces - as usual: "allow-hotplug eth0", "iface eth0 
inet dhcp"

Systemd upgraded from 215-17+deb8u5 up to 215-17+deb8u6

The system hangs for 1m30s during boot up, network interface is down, 
but can be ifup'ed manually.

Reverting ifup@.service back to deb8u5 solves the problem:

diff -u ./systemd-8u6/ifup@.service ./systemd-8u5/ifup@.service
--- ./systemd-8u6/ifup@.service 2016-12-21 23:33:51.000000000 +0300
+++ ./systemd-8u5/ifup@.service 2016-07-24 19:55:54.000000000 +0300
@@ -1,9 +1,8 @@
 [Unit]
 Description=ifup for %I
-After=local-fs.target network-pre.target networking.service 
systemd-sysctl.service
+After=local-fs.target network-pre.target networking.service
 Before=network.target
 BindsTo=sys-subsystem-net-devices-%i.device
-After=sys-subsystem-net-devices-%i.device
 ConditionPathIsDirectory=/run/network
 DefaultDependencies=no


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Best regards,
  Dmitry    mailto:sidorov.slomotv@gmail.com