Нет предложения DHCP через коммутатор

Проблема

Я новичок в Ubuntu/Linux, я занимаюсь этим уже пару недель и безуспешно искал ответ в интернете.

У меня есть компьютер Ubuntu, который я использую в качестве домашнего сервера. Он подключается к сети без проблем, если я подключаю его прямо к маршрутизатору. Он отказывается подключаться к Интернету, когда я ставлю переключатель между ним и маршрутизатором. Сетевой клиент застревает на "подключении" и выдает "активация сетевого подключения не удалась". Насколько я могу судить, у сервера, похоже, проблемы с получением ответа DHCP.

В связи с местными обстоятельствами мне нужно, чтобы настройка работала при использовании коммутатора.

Я надеюсь, что кто-то, кто видит это, сможет помочь мне в правильном направлении. Буду рад предоставить любую дополнительную информацию.

Карта сети

Карта сети

На этом изображении все красные линии - линии, которые не работают, а зеленые - линии, которые работают.

Технические характеристики

• ОС: Ubuntu 20.04.2 LTS (была на Ubuntu 16.something, те же результаты)
• Процессор: Intel Xeon(R) CPU X3450 @ 2.67GHz x 8
• NIC 1 (AKA enp4s0): Intel Corporation 82574L Gigabit Network Connection
• NIC 2 (AKA enp5s0): Intel Corporation 82574L Gigabit Network Connection
• Маршрутизатор: Arris NVG468MQ (пару недель назад был другой маршрутизатор. Те же результаты)
• Коммутатор: Netgear GS305 (Также пробовали TP-Link TL-SGG105 и TP-Link SF1008D)

Примечания

• Ручная установка IP-адреса не устраняет проблему.
• Обе сетевые карты имеют одну и ту же проблему.
• Все кабели ethernet - кабели cat 5e или cat 6
• Проблема проявляется на установленных ОС (20.04.2 и 16.something), pupply linux live CD и ubuntu 20.04.2 live USB.
• По большей части сервер не отображается ни на одной из страниц администратора маршрутизатора/списках устройств
• После выполнения следующей команды, которая, как кто-то сказал, делает сетевой интерфейс "promiscuous", сервер отображается в списке устройств маршрутизатора, но сеть по-прежнему не работает: ``$ sudo tcpdump -n udp port 68 -vv```
• В настоящее время на совершенно новой, полностью обновленной установке
• Сервер был перезагружен несколько раз
• "dhclient -r" не имеет заметного влияния
• "dhclient enp4s0" не имеет заметного влияния

Результаты работы терминала

$ lspci | grep Ethernet

04:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
05:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection

$ cat /etc/NetworkManager/NetworkManager. conf

[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no

$ sudo dhclient -v enp4s0

Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/enp4s0/90:e6:ba:92:24:94
Sending on LPF/enp4s0/90:e6:ba:92:24:94
Sending on Socket/fallback
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 3 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 3 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 4 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 7 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 10 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 16 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 20 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 18 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 21 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 12 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 20 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 14 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 14 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 13 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 16 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 16 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 17 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 12 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 9 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 13 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 7 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 11 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 11 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 8 (xid=0xb03b7843)
DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 6 (xid=0xb03b7843)
No DHCPOFFERS received.
No working leases in persistent database – sleeping.

$ sudo tail -f /var/log/syslog

[sudo] password for andrew:
May 30 12:57:48 FemmiServ avahi-daemon[644]: Withdrawing address record for
fe80::6e01:80b5:40b3:8ccd on enp4s0.
    
    May 30 12:57:48 FemmiServ avahi-daemon[644]: Leaving mDNS multicast group on interface
    enp4s0.IPv6 with address fe80::6e01:80b5:40b3:8ccd.
    May 30 12:57:48 FemmiServ avahi-daemon[644]: Interface enp4s0.IPv6 no longer relevant for mDNS.
    May 30 12:57:49 FemmiServ NetworkManager[648]: <info> [1622404669.0053] dhcp4 (enp4s0):
    canceled DHCP transaction
    May 30 12:57:49 FemmiServ NetworkManager[648]: <info> [1622404669.0054] dhcp4 (enp4s0): state
    changed timeout -> done
    May 30 12:57:49 FemmiServ dbus-daemon[647]: [system] Activating via systemd: service
    name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by
    ':1.12' (uid=0 pid=648 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
    May 30 12:57:49 FemmiServ systemd[1]: Starting Network Manager Script Dispatcher Service...
    May 30 12:57:49 FemmiServ dbus-daemon[647]: [system] Successfully activated service
    'org.freedesktop.nm_dispatcher'
    May 30 12:57:49 FemmiServ systemd[1]: Started Network Manager Script Dispatcher Service.
    May 30 12:57:58 FemmiServ systemd[1]: NetworkManager-dispatcher.service: Succeeded.
    May 30 13:01:13 FemmiServ dbus-daemon[647]: [system] Activating via systemd: service
    name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.76'
    (uid=1000 pid=1909 comm="gnome-control-center network " label="unconfined")
    May 30 13:01:13 FemmiServ systemd[1]: Starting Hostname Service...
    May 30 13:01:13 FemmiServ dbus-daemon[647]: [system] Successfully activated service
    'org.freedesktop.hostname1'
    May 30 13:01:13 FemmiServ systemd[1]: Started Hostname Service.
    
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6479] audit: op="connection-
    update" uuid="3f27339b-ac78-3932-a93a-0348c70a25af" name="Wired connection 1"
    
    args="connection.timestamp,ipv6.method" pid=1909 uid=1000 result="success"
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6486] policy: auto-activating
    connection 'Wired connection 1' (3f27339b-ac78-3932-a93a-0348c70a25af)
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6529] device (enp4s0):
    Activation: starting connection 'Wired connection 1' (3f27339b-ac78-3932-a93a-0348c70a25af)
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6531] device (enp4s0): state
    change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6539] manager:
    NetworkManager state is now CONNECTING
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6543] device (enp4s0): state
    change: prepare -> config (reason 'none', sys-iface-state: 'managed')
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6558] device (enp4s0): state
    change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
    May 30 13:01:21 FemmiServ NetworkManager[648]: <info> [1622404881.6562] dhcp4 (enp4s0):
    activation: beginning transaction (timeout in 45 seconds)
    May 30 13:01:23 FemmiServ avahi-daemon[644]: Joining mDNS multicast group on interface
    enp4s0.IPv6 with address fe80::92e6:baff:fe92:2494.
    May 30 13:01:23 FemmiServ avahi-daemon[644]: New relevant interface enp4s0.IPv6 for mDNS.
    May 30 13:01:23 FemmiServ avahi-daemon[644]: Registering new address record for
    fe80::92e6:baff:fe92:2494 on enp4s0.*.
    May 30 13:01:43 FemmiServ dbus-daemon[867]: [session uid=1000 pid=867] Activating via systemd:
    service name='org.bluez.obex' unit='dbus-org.bluez.obex.service' requested by ':1.136' (uid=1000
    pid=1909 comm="gnome-control-center network " label="unconfined")
    May 30 13:01:43 FemmiServ systemd[1]: systemd-hostnamed.service: Succeeded.
    May 30 13:01:43 FemmiServ systemd[801]: Starting Bluetooth OBEX service...
    May 30 13:01:43 FemmiServ obexd[2604]: OBEX daemon 5.53
    May 30 13:01:43 FemmiServ dbus-daemon[867]: [session uid=1000 pid=867] Successfully activated
    service 'org.bluez.obex'
    May 30 13:01:43 FemmiServ systemd[801]: Started Bluetooth OBEX service.
    May 30 13:02:03 FemmiServ dbus-daemon[647]: [system] Activating via systemd: service
    name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by
    ':1.12' (uid=0 pid=648 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
    May 30 13:02:03 FemmiServ systemd[1]: Starting Network Manager Script Dispatcher Service...
    
    May 30 13:02:03 FemmiServ dbus-daemon[647]: [system] Successfully activated service
    'org.freedesktop.nm_dispatcher'
    May 30 13:02:03 FemmiServ systemd[1]: Started Network Manager Script Dispatcher Service.
    May 30 13:02:06 FemmiServ NetworkManager[648]: <warn> [1622404926.9662] dhcp4 (enp4s0):
    request timed out
    May 30 13:02:06 FemmiServ NetworkManager[648]: <info> [1622404926.9662] dhcp4 (enp4s0): state
    changed unknown -> timeout
    May 30 13:02:06 FemmiServ NetworkManager[648]: <info> [1622404926.9663] device (enp4s0): state
    change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed')
    May 30 13:02:06 FemmiServ NetworkManager[648]: <info> [1622404926.9673] manager:
    NetworkManager state is now DISCONNECTED
    May 30 13:02:06 FemmiServ NetworkManager[648]: <warn> [1622404926.9696] device (enp4s0):
    Activation: failed for connection 'Wired connection 1'
    May 30 13:02:06 FemmiServ NetworkManager[648]: <info> [1622404926.9704] device (enp4s0): state
    change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
    May 30 13:02:06 FemmiServ avahi-daemon[644]: Withdrawing address record for
    fe80::92e6:baff:fe92:2494 on enp4s0.

$ journalctl

-- Logs begin at Sun 2021-05-30 12:30:22 PDT, end at Sun 2021-05-30 12:57:49 PD>
    May 30 12:30:22 FemmiServ kernel: microcode: microcode updated early to revisio>
    May 30 12:30:22 FemmiServ kernel: Linux version 5.8.0-43-generic (buildd@lcy01->
    May 30 12:30:22 FemmiServ kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.8.0->
    May 30 12:30:22 FemmiServ kernel: KERNEL supported cpus:
    May 30 12:30:22 FemmiServ kernel: Intel GenuineIntel
    May 30 12:30:22 FemmiServ kernel: AMD AuthenticAMD
    May 30 12:30:22 FemmiServ kernel: Hygon HygonGenuine
    May 30 12:30:22 FemmiServ kernel: Centaur CentaurHauls
    May 30 12:30:22 FemmiServ kernel: zhaoxin Shanghai
    May 30 12:30:22 FemmiServ kernel: x86/fpu: x87 FPU will use FXSAVE
    May 30 12:30:22 FemmiServ kernel: BIOS-provided physical RAM map:
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x0000000000000000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x000000000009fc00-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000000e4000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf77e000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf780000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf78e000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf7dc000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000e0000000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000>
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000ffe00000-0x00000000>
    lines 1-23...skipping...
    -- Logs begin at Sun 2021-05-30 12:30:22 PDT, end at Sun 2021-05-30 12:57:49 PDT. --
    May 30 12:30:22 FemmiServ kernel: microcode: microcode updated early to revision 0xa, date = 2018-
    05-08
    May 30 12:30:22 FemmiServ kernel: Linux version 5.8.0-43-generic (buildd@lcy01-amd64-018) (gcc
    (Ubuntu 9.3.0->
    May 30 12:30:22 FemmiServ kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-5.8.0-43-generic
    root=UUID=42c3d73b->
    May 30 12:30:22 FemmiServ kernel: KERNEL supported cpus:
    May 30 12:30:22 FemmiServ kernel: Intel GenuineIntel
    May 30 12:30:22 FemmiServ kernel: AMD AuthenticAMD
    May 30 12:30:22 FemmiServ kernel: Hygon HygonGenuine
    May 30 12:30:22 FemmiServ kernel: Centaur CentaurHauls
    May 30 12:30:22 FemmiServ kernel: zhaoxin Shanghai
    
    May 30 12:30:22 FemmiServ kernel: x86/fpu: x87 FPU will use FXSAVE
    May 30 12:30:22 FemmiServ kernel: BIOS-provided physical RAM map:
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff]
    usable
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff]
    reserved
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000000e4000-0x00000000000fffff]
    reserved
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000bf76ffff]
    usable
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf77e000-0x00000000bf77ffff] type
    9
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf780000-0x00000000bf78dfff]
    ACPI data
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf78e000-0x00000000bf7dbfff]
    ACPI NVS
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000bf7dc000-0x00000000bfffffff]
    reserved
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000e0000000-0x00000000efffffff]
    reserved
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff]
    reserved
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x00000000ffe00000-0x00000000ffffffff]
    reserved
    May 30 12:30:22 FemmiServ kernel: BIOS-e820: [mem 0x0000000100000000-0x000000043fffffff]
    usable
    May 30 12:30:22 FemmiServ kernel: NX (Execute Disable) protection: active
    May 30 12:30:22 FemmiServ kernel: SMBIOS 2.6 present.
    May 30 12:30:22 FemmiServ kernel: DMI: System manufacturer System Product Name/P7F-E, BIOS
    0303 09/02/2009
    May 30 12:30:22 FemmiServ kernel: tsc: Fast TSC calibration failed
    May 30 12:30:22 FemmiServ kernel: e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
    May 30 12:30:22 FemmiServ kernel: e820: remove [mem 0x000a0000-0x000fffff] usable
    May 30 12:30:22 FemmiServ kernel: last_pfn = 0x440000 max_arch_pfn = 0x400000000
    May 30 12:30:22 FemmiServ kernel: MTRR default type: uncachable
    May 30 12:30:22 FemmiServ kernel: MTRR fixed ranges enabled:
    May 30 12:30:22 FemmiServ kernel: 00000-9FFFF write-back
    May 30 12:30:22 FemmiServ kernel: A0000-BFFFF uncachable
    May 30 12:30:22 FemmiServ kernel: C0000-CBFFF write-protect
    May 30 12:30:22 FemmiServ kernel: CC000-DFFFF uncachable
    May 30 12:30:22 FemmiServ kernel: E0000-E7FFF write-through
    May 30 12:30:22 FemmiServ kernel: E8000-FFFFF write-protect
    May 30 12:30:22 FemmiServ kernel: MTRR variable ranges enabled

$ sudo lshw -C network

*-network
    description: Ethernet interface
    product: 82574L Gigabit Network Connection
    vendor: Intel Corporation
    physical id: 0
    bus info: pci@0000:04:00.0
    logical name: enp4s0
    version: 00
    serial: 90:e6:ba:92:24:94
    size: 1Gbit/s
    capacity: 1Gbit/s
    width: 32 bits
    
    clock: 33MHz
    capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt
    100bt-fd 1000bt-fd autonegotiation
    configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full
    firmware=1.8-0 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
    resources: irq:18 memory:fbce0000-fbcfffff ioport:cc00(size=32) memory:fbcdc000-fbcdffff
    *-network
    description: Ethernet interface
    product: 82574L Gigabit Network Connection
    vendor: Intel Corporation
    physical id: 0
    bus info: pci@0000:05:00.0
    logical name: enp5s0
    version: 00
    serial: 90:e6:ba:92:26:5f
    capacity: 1Gbit/s
    width: 32 bits
    clock: 33MHz
    capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt
    100bt-fd 1000bt-fd autonegotiation
    configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=1.8-
    0 latency=0 link=no multicast=yes port=twisted pair
    resources: irq:19 memory:fbe00000-fbe1ffff ioport:dc00(size=32) memory:fbdfc000-fbdfffff
    andrew@FemmiServ:~$ ip ro
    default dev enp5s0 scope link metric 1003 linkdown
    169.254.0.0/16 dev enp5s0 proto kernel scope link src 169.254.7.132 linkdown

$ systemctl

     UNIT LOAD ACTIV>
        proc-sys-fs-binfmt_misc.automount loaded activ>
        dev-loop7.device loaded activ>
        sys-devices-pci0000:00-0000:00:1b.0-sound-card0.device loaded activ>
        sys-devices-pci0000:00-0000:00:1c.6-0000:04:00.0-net-enp4s0.device loaded activ>
        sys-devices-pci0000:00-0000:00:1c.7-0000:05:00.0-net-enp5s0.device loaded activ>
        sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda1.device loaded
        activ>
        sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda.device loaded activ>
        sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:1-0:0:1:0-block-sdb.device loaded activ>
        sys-devices-pci0000:00-0000:00:1f.2-ata2-host1-target1:0:0-1:0:0:0-block-sdc.device loaded activ>
        sys-devices-pci0000:00-0000:00:1f.2-ata2-host1-target1:0:1-1:0:1:0-block-sdd-sdd1.device loaded
        activ>
        sys-devices-pci0000:00-0000:00:1f.2-ata2-host1-target1:0:1-1:0:1:0-block-sdd.device loaded activ>
        sys-devices-pci0000:00-0000:00:1f.5-ata3-host2-target2:0:0-2:0:0:0-block-sde-sde1.device loaded
        activ>
        sys-devices-pci0000:00-0000:00:1f.5-ata3-host2-target2:0:0-2:0:0:0-block-sde.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS10.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS11.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS12.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS13.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS14.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS15.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS16.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS17.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS18.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS19.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS2.device loaded activ>
        
        sys-devices-platform-serial8250-tty-ttyS20.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS21.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS22.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS23.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS24.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS25.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS26.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS27.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS28.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS29.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS3.device loaded activ>
        sys-devices-platform-serial8250-tty-ttyS30.device loaded activ>
        
        andrew@FemmiServ:~$ ps aux |egrep wpa\|com
        root 68 0.0 0.0 0 0 ? S May30 0:00 [kcompactd0]
        root 686 0.0 0.0 13688 4880 ? Ss May30 0:00 /sbin/wpa_supplicant -u -s -O
        /run/wpa_supplicant
        andrew 1414 0.0 0.1 282780 29756 ? Ssl May30 0:00 /usr/libexec/gsd-wacom
        andrew 14511 0.0 0.0 17672 724 pts/0 S+ 15:04 0:00 grep -E --color=auto wpa|com
        andrew@FemmiServ:~$ sudo tcpdump -v
        tcpdump: listening on enp4s0, link-type EN10MB (Ethernet), capture size 262144 bytes
        15:13:07.192454 IP (tos 0x0, ttl 1, id 50360, offset 0, flags [none], proto UDP (17), length 202)
        50.39.173.111.51922 > 239.255.255.250.1900: UDP, length 174
        15:13:08.206626 IP (tos 0x0, ttl 1, id 50361, offset 0, flags [none], proto UDP (17), length 202)
        50.39.173.111.51922 > 239.255.255.250.1900: UDP, length 174
        15:13:09.208272 IP (tos 0x0, ttl 1, id 50362, offset 0, flags [none], proto UDP (17), length 202)
        50.39.173.111.51922 > 239.255.255.250.1900: UDP, length 174
        15:13:10.213948 IP (tos 0x0, ttl 1, id 50363, offset 0, flags [none], proto UDP (17), length 202)
        50.39.173.111.51922 > 239.255.255.250.1900: UDP, length 174
        15:13:11.108123 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:13:17.128842 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:13:23.149624 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:13:28.638930 IP (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 321)
        0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 90:e6:ba:92:24:94 (oui
        Unknown), length 293, xid 0xaa2ba215, secs 836, Flags [none]
        Client-Ethernet-Address 90:e6:ba:92:24:94 (oui Unknown)
        Vendor-rfc1048 Extensions
        Magic Cookie 0x63825363
        DHCP-Message Option 53, length 1: Discover
        Client-ID Option 61, length 7: ether 90:e6:ba:92:24:94
        Parameter-Request Option 55, length 17:
        Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
        Domain-Name, MTU, BR, Classless-Static-Route
        Default-Gateway, Static-Route, YD, YS
        NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
        RP
        MSZ Option 57, length 2: 576
        Requested-IP Option 50, length 4: 192.168.254.24
        Hostname Option 12, length 9: "FemmiServ"
        15:13:29.170117 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:13:35.190450 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        
        0.0.0.0, length 46
        15:13:41.212982 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:13:47.231609 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:13:53.251508 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:13:59.271474 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        15:14:05.290307 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.144.200 (Broadcast) tell
        0.0.0.0, length 46
        ^C
        15 packets captured
        15 packets received by filter
        0 packets dropped by kernel

$ sudo tcpdump -n udp port 68 -vv

tcpdump: listening on enp4s0, link-type EN10MB (Ethernet), capture size 262144 bytes
    15:17:46.522511 IP (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 321)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 90:e6:ba:92:24:94,
    length 293, xid 0xf259977b, secs 1094, Flags [none] (0x0000)
    Client-Ethernet-Address 90:e6:ba:92:24:94
    Vendor-rfc1048 Extensions
    Magic Cookie 0x63825363
    DHCP-Message Option 53, length 1: Discover
    Client-ID Option 61, length 7: ether 90:e6:ba:92:24:94
    Parameter-Request Option 55, length 17:
    Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
    Domain-Name, MTU, BR, Classless-Static-Route
    Default-Gateway, Static-Route, YD, YS
    NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
    RP
    MSZ Option 57, length 2: 576
    Requested-IP Option 50, length 4: 192.168.254.24
    Hostname Option 12, length 9: "FemmiServ"
    15:18:50.758747 IP (tos 0xc0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 321)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 90:e6:ba:92:24:94,
    length 293, xid 0x355ce1b5, secs 1158, Flags [none] (0x0000)
    Client-Ethernet-Address 90:e6:ba:92:24:94
    Vendor-rfc1048 Extensions
    Magic Cookie 0x63825363
    DHCP-Message Option 53, length 1: Discover
    Client-ID Option 61, length 7: ether 90:e6:ba:92:24:94
    Parameter-Request Option 55, length 17:
    Subnet-Mask, Time-Zone, Domain-Name-Server, Hostname
    Domain-Name, MTU, BR, Classless-Static-Route
    Default-Gateway, Static-Route, YD, YS
    NTP, Option 119, Classless-Static-Route-Microsoft, Option 252
    RP
    MSZ Option 57, length 2: 576
    Requested-IP Option 50, length 4: 192.168.254.24
    Hostname Option 12, length 9: "FemmiServ"
    ^C
    2 packets captured
    2 packets received by filter
    0 packets dropped by kernel

---------- EDIT ----------

$ ip route show

default dev enp5s0 scope link metric 1003 linkdown

169.254.0.0/16 dev enp5s0 proto kernel scope link src 169.254.7.132 linkdown

$ ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000

link/ether 90:e6:ba:92:24:94 brd ff:ff:ff:ff:ff:ff

3: enp5s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000

link/ether 90:e6:ba:92:26:5f brd ff:ff:ff:ff:ff:ff

inet 169.254.7.132/16 brd 169.254.255.255 scope link enp5s0:avahi

valid_lft forever preferred_lft forever

$ cat /etc/netplan/*. yaml

# Let NetworkManager manage all devices on this system
network:
  version: 2 
  renderer: NetworkManager 

$ cat /etc/network/interfaces

cat: /etc/network/interfaces: No such file or directory