Собсно проблема с сабжем возникает периодически, решается как правило ребутом, не всегда с первого ребута правда. Debian stable up-to-date (10), впрочем на 9 была таже проблема. DE и сопутствующих приблуд для управления сетевыми интерфейсами не устанавливал, работаю с ним только по SSH. Выхлоп разных логов под cut'ом
sudo ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 176.14.224.231 netmask 255.255.240.0 broadcast 176.14.239.255
inet6 fe80::4ecc:6aff:fef6:96d9 prefixlen 64 scopeid 0x20<link>
ether 4c:cc:6a:f6:96:d9 txqueuelen 1000 (Ethernet)
RX packets 520305 bytes 88470062 (84.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 570729 bytes 819894338 (781.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 2560 bytes 1231053 (1.1 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2560 bytes 1231053 (1.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.1 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::f68c:50ff:fe6f:b56c prefixlen 64 scopeid 0x20<link>
ether f4:8c:50:6f:b5:6c txqueuelen 1000 (Ethernet)
RX packets 23357 bytes 2834598 (2.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 47856 bytes 59989394 (57.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
sudo cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
allow-hotplug wlan0
iface wlan0 inet static
address 192.168.0.1
netmask 255.255.255.0
network 192.168.0.0
maks@Server:~$ sudo dmesg на pastebin ибо слишком толсто: https://pastebin.com/s35k107q
maks@Server:~$ sudo journalctl -xf
-- Logs begin at Sun 2020-08-09 10:39:07 MSK. --
авг 09 10:52:47 Server sudo[1834]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:52:47 Server sudo[1834]: pam_unix(sudo:session): session closed for user root
авг 09 10:52:49 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:53:01 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:53:17 Server sudo[1845]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/bin/journalctl
авг 09 10:53:17 Server sudo[1845]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:53:20 Server sudo[1845]: pam_unix(sudo:session): session closed for user root
авг 09 10:53:20 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:53:26 Server sudo[1859]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/bin/journalctl -xf
авг 09 10:53:26 Server sudo[1859]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:53:26 Server Plex Media Server[796]: sendto: Network is unreachable
авг 09 10:53:27 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
авг 09 10:53:29 Server Plex Media Server[796]: sendto: Network is unreachable
авг 09 10:53:33 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
авг 09 10:53:41 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15
авг 09 10:53:56 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
maks@Server:~$ sudo journalctl -xe
-- Результат: done.
авг 09 10:50:02 Server systemd[1733]: Startup finished in 62ms.
-- Subject: Завершен запуск менеджера пользовательского сеанса
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Менеджер пользовательского сеанса для пользователя с идентификатором 1000
-- был запущен. Все службы, стоявшие в очереди на запуск, также были запущены. Тем
-- не менее, прочие службы могут все еще находиться в процессе запуска, либо могут
-- быть запущены позднее.
--
-- Запуск менеджера занял 62962 микросекунд.
авг 09 10:50:04 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:50:20 Server sudo[1752]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/sbin/ifconfig
авг 09 10:50:20 Server sudo[1752]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:50:20 Server sudo[1752]: pam_unix(sudo:session): session closed for user root
авг 09 10:50:21 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:50:31 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:50:47 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:50:56 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:51:00 Server sudo[1778]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/bin/dmesg
авг 09 10:51:00 Server sudo[1778]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:51:01 Server sudo[1778]: pam_unix(sudo:session): session closed for user root
авг 09 10:51:08 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:51:25 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:51:32 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:51:37 Server systemd-timesyncd[440]: Timed out waiting for reply from 193.109.84.119:123 (2.debian.pool.ntp
авг 09 10:51:47 Server systemd-timesyncd[440]: Timed out waiting for reply from 193.192.36.3:123 (2.debian.pool.ntp.o
авг 09 10:51:51 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:51:57 Server systemd-timesyncd[440]: Timed out waiting for reply from 89.110.32.178:123 (2.debian.pool.ntp.
авг 09 10:51:58 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:52:07 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 78.107.125.61 port 67
авг 09 10:52:08 Server systemd-timesyncd[440]: Timed out waiting for reply from 185.22.60.71:123 (2.debian.pool.ntp.o
авг 09 10:52:21 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:52:38 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:52:47 Server sudo[1834]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/bin/cat /etc/network/
авг 09 10:52:47 Server sudo[1834]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:52:47 Server sudo[1834]: pam_unix(sudo:session): session closed for user root
авг 09 10:52:49 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:53:01 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:53:17 Server sudo[1845]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/bin/journalctl
авг 09 10:53:17 Server sudo[1845]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:53:20 Server sudo[1845]: pam_unix(sudo:session): session closed for user root
авг 09 10:53:20 Server dhclient[701]: DHCPREQUEST for 176.14.224.231 on eth0 to 255.255.255.255 port 67
авг 09 10:53:26 Server sudo[1859]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/bin/journalctl -xf
авг 09 10:53:26 Server sudo[1859]: pam_unix(sudo:session): session opened for user root by maks(uid=0)
авг 09 10:53:26 Server Plex Media Server[796]: sendto: Network is unreachable
авг 09 10:53:27 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
авг 09 10:53:29 Server Plex Media Server[796]: sendto: Network is unreachable
авг 09 10:53:33 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
авг 09 10:53:41 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15
авг 09 10:53:56 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
авг 09 10:54:06 Server sudo[1859]: pam_unix(sudo:session): session closed for user root
авг 09 10:54:10 Server dhclient[701]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 18
авг 09 10:54:10 Server systemd[1]: Starting Cleanup of Temporary Directories...
-- Subject: Начинается запуск юнита systemd-tmpfiles-clean.service
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Начат процесс запуска юнита systemd-tmpfiles-clean.service.
авг 09 10:54:10 Server systemd[1]: systemd-tmpfiles-clean.service: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit systemd-tmpfiles-clean.service has successfully entered the 'dead' state.
авг 09 10:54:10 Server systemd[1]: Started Cleanup of Temporary Directories.
-- Subject: Запуск юнита systemd-tmpfiles-clean.service завершен
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Процесс запуска юнита systemd-tmpfiles-clean.service был завершен.
--
-- Результат: done.
авг 09 10:54:10 Server sudo[1883]: maks : TTY=pts/0 ; PWD=/home/maks ; USER=root ; COMMAND=/bin/journalctl -xe
авг 09 10:54:10 Server sudo[1883]: pam_unix(sudo:session): session opened for user root by maks(uid=0)