Failed to start syslog-ng after reboot, network non-functional inmediatly (Pi 2)

[luis-sanmiguel]

syslog-ng fails to start at boot if you use the IP address of the ethernet interface (static IP address):

source s_udp { udp(ip(10.1.1.1) port(514)); };

After boot, if you manually start syslog-ng service, it starts with no problems:

service syslog-ng start

If you change the IP address to 0.0.0.0, the service starts at boot with no problems. So I think the network interface is up but the IP address is not already bind to the interface.

Describe the bug
I think the problem is in $network dependency. It dont check if the IP address is bind to the ethernet interface. From the init.d script:;

Required-Stop: $local_fs $network $time $remote_fs

To reproduce
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Expected behaviour
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Actual behaviour
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System
Copy and paste the results of the raspinfo command in to this section. Alternatively, copy and paste a pastebin link, or add answers to the following questions:

• Which model of Raspberry Pi? e.g. Pi3B+, PiZeroW

• Which OS and version (cat /etc/rpi-issue)?
  Raspberry Pi reference 2018-11-13
  Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 7e0c786c641ba15990b5662f092c106beed40c9f, stage2

• Which firmware version (vcgencmd version)?
  Mar 27 2019 15:45:53
  Copyright (c) 2012 Broadcom
  version 2e98b31d18547962e564bdf88e57b3df7085c29b (clean) (release) (start)

• Which kernel version (uname -a)?
  Linux leonidas 4.19.42-v7+ system freeze while unplug r8152 usb2network card #1219 SMP Tue May 14 21:20:58 BST 2019 armv7l GNU/Linux

Logs
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service syslog-ng status
● syslog-ng.service - System Logger Daemon
Loaded: loaded (/lib/systemd/system/syslog-ng.service; enabled; vendor preset: enable
Active: failed (Result: exit-code) since Wed 2019-07-03 01:09:42 CEST; 6min ago
Docs: man:syslog-ng(8)
Process: 535 ExecStart=/usr/sbin/syslog-ng -F $SYSLOGNG_OPTS (code=exited, status=2)
Main PID: 535 (code=exited, status=2)
Status: "Starting up... (Wed Jul 3 01:09:42 2019"

Jul 03 01:09:42 leonidas systemd[1]: syslog-ng.service: Failed with result 'exit-code'.
Jul 03 01:09:42 leonidas systemd[1]: syslog-ng.service: Service hold-off time over, sche
Jul 03 01:09:42 leonidas systemd[1]: Stopped System Logger Daemon.
Jul 03 01:09:42 leonidas systemd[1]: syslog-ng.service: Start request repeated too quick
Jul 03 01:09:42 leonidas systemd[1]: Failed to start System Logger Daemon.
Jul 03 01:09:42 leonidas systemd[1]: syslog-ng.service: Unit entered failed state.
Jul 03 01:09:42 leonidas systemd[1]: syslog-ng.service: Failed with result 'exit-code'.
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Additional context
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Hope you will understand