A conexão Ethernet cai por 10 a 20 segundos a cada 20 minutos

Question

Uma ou duas vezes por hora, a conexão ethernet da minha máquina Ubuntu irá cair:

$ ping google.com
(nothing happens)

Depois de 10 a 20s (embora às vezes mais tempo), ele voltará magicamente.

Durante as interrupções, não consigo pingar google.com ou um IP, por isso não acho que seja um problema de DNS. Eu tentei várias coisas para depurar:

1. Reinicializado
2. Atualizou / atualizou todos os pacotes.
3. Desinstalado e reinstalado network-manager .
4. Cabos ethernet trocados.

Meus colegas de trabalho estão conectados ao mesmo roteador que eu e não estão enfrentando esse problema. Por isso, parece ser algo com minha máquina.

Alguma ideia? Estou fresco fora deles e isso está ficando muito frustrante!

Aqui está um monte de informações sobre o meu sistema:

$ lspci
00:00.0 Host bridge: Intel Corporation Device 591f (rev 05)
00:02.0 VGA compatible controller: Intel Corporation Device 5912 (rev 04)
00:14.0 USB controller: Intel Corporation 200 Series PCH USB 3.0 xHCI Controller
00:14.2 Signal processing controller: Intel Corporation 200 Series PCH Thermal Subsystem
00:16.0 Communication controller: Intel Corporation 200 Series PCH CSME HECI #1
00:17.0 SATA controller: Intel Corporation 200 Series PCH SATA controller [AHCI mode]
00:1f.0 ISA bridge: Intel Corporation 200 Series PCH LPC Controller (H270)
00:1f.2 Memory controller: Intel Corporation 200 Series PCH PMC
00:1f.3 Audio device: Intel Corporation 200 Series PCH HD Audio
00:1f.4 SMBus: Intel Corporation 200 Series PCH SMBus Controller
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 17.04
Release:    17.04
Codename:   zesty

$ ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
        inet6 fe80::42:e7ff:fe8d:d514  prefixlen 64  scopeid 0x20<link>
        ether 02:42:e7:8d:d5:14  txqueuelen 0  (Ethernet)
        RX packets 25739  bytes 1591975 (1.5 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 116624  bytes 169185651 (169.1 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp0s31f6: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.201.32.57  netmask 255.255.255.0  broadcast 10.201.32.255
        inet6 fe80::7285:c2ff:fe2a:efa8  prefixlen 64  scopeid 0x20<link>
        ether 70:85:c2:2a:ef:a8  txqueuelen 1000  (Ethernet)
        RX packets 1938458  bytes 1438227394 (1.4 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1442649  bytes 772299655 (772.2 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  memory 0xdf000000-df020000  

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 181354  bytes 50978753 (50.9 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 181354  bytes 50978753 (50.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$ ethtool enp0s31f6
Settings for enp0s31f6:
    Supported ports: [ TP ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Speed: 1000Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 1
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: on (auto)
Cannot get wake-on-lan settings: Operation not permitted
    Current message level: 0x00000007 (7)
                   drv probe link
    Link detected: yes

Aqui está algo que vejo em /var/log/syslog na época de uma conexão descartada:

Jul  7 12:44:02 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:03 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.
Jul  7 12:44:04 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:04 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.
Jul  7 12:44:05 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:06 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.
Jul  7 12:44:07 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:09 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.
Jul  7 12:44:11 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:11 dv systemd-resolved[1259]: Using degraded feature set (UDP+EDNS0+DO) for DNS server 10.201.1.18.
Jul  7 12:44:13 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.
Jul  7 12:44:15 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:17 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.
Jul  7 12:44:18 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:18 dv systemd-resolved[1259]: Using degraded feature set (UDP) for DNS server 10.201.1.18.
Jul  7 12:44:18 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.
Jul  7 12:44:20 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.18 for interface enp0s31f6.
Jul  7 12:44:22 dv systemd-resolved[1259]: Switching to DNS server 10.201.1.15 for interface enp0s31f6.