After updating openSUSE 13.1 on reboot the server did not have network and was
not reachable:

this packages were updated:
libgudev-1_0-0 libudev1 systemd systemd-32bit systemd-sysvinit udev

to versions:
systemd=210-40.1
systemd-sysvinit=210-40.1
udev=210-40.1
libudev1=210-40.1

after downgrade to previous version network on reboot worked fine

from /var/log/messages on boot network eth0 failed 
Feb  8 16:29:49 ml SuSEfirewall2: Firewall rules set to CLOSE.
Feb  8 16:29:50 ml network[547]: Setting up network interfaces:
Feb  8 16:29:50 ml network[547]: lo
Feb  8 16:29:50 ml ifup[801]:     lo
Feb  8 16:29:50 ml ifup: Last message '    lo' repeated 1 times, suppressed by
syslog-ng on ml
Feb  8 16:29:50 ml ifup[801]: IP address: 127.0.0.1/8
Feb  8 16:29:50 ml network[547]: lo        IP address: 127.0.0.1/8
Feb  8 16:29:50 ml ifup[801]:
Feb  8 16:29:50 ml ModemManager[465]: <warn>  Couldn't find support for device
at '/sys/devices/pci0000:00/0000:00:1c.
0/0000:01:00.0': not supported by any plugin
Feb  8 16:29:51 ml network[547]: ..done    enp1s0    Startmode is 'manual' ->
skipping
Feb  8 16:29:51 ml ifup[934]:     enp1s0    Startmode is 'manual' -> skipping
Feb  8 16:29:51 ml network[547]: ..skippedWaiting for mandatory devices:  eth0
Feb  8 16:30:21 ml network[547]: 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15
14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Feb  8 16:30:21 ml network[547]: eth0