Something is making the network on your Synology change.
Given it happens every day,
- I suspect you have DHCP giving it an IP address (from your modem router).
- DHCP refresh will make the adapters shutdown and restart.
- Your logs are consistent with such activity . Look at
eth0 (LAN 1)
The solution it to assign your NAS a fixed (static) IP address.
Apr 08, 2020 10:55:27.550 [0x7fc2fdcaa700] DEBUG - NetworkInterface: Notified of network changed (force=0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - Detected primary interface: 0.0.0.0
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - Network interfaces:
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 1 lo (127.0.0.1) (loopback: 1)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 4 eth1 (169.254.22.221) (loopback: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 5 docker0 (172.17.0.1) (loopback: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 1 lo (::1) (loopback: 1)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 3 eth0 (fe80::211:32ff:fec1:330d%eth0) (loopback: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 5 docker0 (fe80::42:64ff:fed5:5eec%docker0) (loopback: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 7 dockerb27069d (fe80::2489:8fff:fec3:47d4%dockerb27069d) (loopback: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 9 dockera557235 (fe80::b882:c7ff:fef4:131a%dockera557235) (loopback: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - * 11 docker1bbad62 (fe80::a0fe:6fff:feb4:21f3%docker1bbad62) (loopback: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Got notification of changed network (first change: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Dispatch network change after two second delay.
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Got notification of changed network (first change: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Dispatch network change after two second delay.
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Got notification of changed network (first change: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Dispatch network change after two second delay.
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Got notification of changed network (first change: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Dispatch network change after two second delay.
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Got notification of changed network (first change: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Dispatch network change after two second delay.
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Got notification of changed network (first change: 0)
Apr 08, 2020 10:55:27.552 [0x7fc2fdcaa700] DEBUG - NetworkService: Dispatch network change after two second delay.
Apr 08, 2020 10:55:27.553 [0x7fc2fdcaa700] ERROR - getaddrinfo(172-17-0-1.abcdefghijklmnopqrstuvwxyz012345.plex.direct) failed: -3
Apr 08, 2020 10:55:27.553 [0x7fc2fdcaa700] DEBUG - Network: 172-17-0-1.abcdefghijklmnopqrstuvwxyz012345.plex.direct failed to resolve to 172.17.0.1 but instead yielded ""
Apr 08, 2020 10:55:27.553 [0x7fc2fdcaa700] DEBUG - PublicAddressManager: Obtaining public address and mapping port.
Apr 08, 2020 10:55:27.553 [0x7fc27fd11700] DEBUG - PublicAddressManager: Obtaining public IP.
Apr 08, 2020 10:55:27.553 [0x7fc27fd11700] DEBUG - HTTP requesting GET http://plex.tv/pms/:/ip
Apr 08, 2020 10:55:27.556 [0x7fc2fdcaa700] DEBUG - NetworkInterface: received Netlink message len=88, type=RTM_DELADDR, flags=0x0
Apr 08, 2020 10:55:27.556 [0x7fc2fdcaa700] DEBUG - NetworkInterface: Netlink address message family=2, index=3, flags=0x80
Apr 08, 2020 10:55:27.556 [0x7fc2fdcaa700] DEBUG - Network change.
Apr 08, 2020 10:55:27.556 [0x7fc2fdcaa700] DEBUG - NetworkInterface: Notified of network changed (force=0)
Apr 08, 2020 10:55:27.556 [0x7fc2fdcaa700] DEBUG - Detected primary interface: 0.0.0.0
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - Network interfaces:
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 1 lo (127.0.0.1) (loopback: 1)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 3 eth0 (192.168.100.100) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 4 eth1 (169.254.22.221) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 5 docker0 (172.17.0.1) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 1 lo (::1) (loopback: 1)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 3 eth0 (fe80::211:32ff:fec1:330d%eth0) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 5 docker0 (fe80::42:64ff:fed5:5eec%docker0) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 7 dockerb27069d (fe80::2489:8fff:fec3:47d4%dockerb27069d) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 9 dockera557235 (fe80::b882:c7ff:fef4:131a%dockera557235) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - * 11 docker1bbad62 (fe80::a0fe:6fff:feb4:21f3%docker1bbad62) (loopback: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - NetworkService: Got notification of changed network (first change: 0)
Apr 08, 2020 10:55:27.557 [0x7fc2fdcaa700] DEBUG - NetworkService: Dispatch network change after two second delay.