Ubuntu 18.04，我每天大概会收到十几个这样的错误：
Jul 17 21:58:29 [servername] NetworkManager[929]: <info> [1626577109.7049] connectivity: (enp3s0) timed out
我在主板的内置 NIC 上遇到了这些问题，所以我用子卡 NIC 替换了它，并禁用了板载 NIC，但我仍然遇到同样的问题。我更换了网线，仍然没有解决。路由器基本上是全新的。有什么想法吗？
@Terrance：
> lspci | grep Ethernet
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (7) I219-V (rev 10)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. Device 8161 (rev 15)
> lshw -C network | grep configuration
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8168e-3_0.0.4 03/27/12 ip=10.1.1.182 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip=192.168.1.120 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.2-4 latency=0 link=no multicast=yes port=twisted pair
> ifconfig
enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.1.1.182 netmask 255.255.255.0 broadcast 10.1.1.255
inet6 fe80::1efd:8ff:fe70:2173 prefixlen 64 scopeid 0x20<link>
ether 1c:fd:08:70:21:73 txqueuelen 1000 (Ethernet)
RX packets 222302237 bytes 320974231227 (320.9 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 98557310 bytes 6537060870 (6.5 GB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.120 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::a27a:416f:4a38:f590 prefixlen 64 scopeid 0x20<link>
ether 00:31:92:46:96:a5 txqueuelen 1000 (Ethernet)
RX packets 81523790 bytes 87489473670 (87.4 GB)
RX errors 0 dropped 12 overruns 0 frame 0
TX packets 82257248 bytes 88740819287 (88.7 GB)
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 10158 bytes 1314073 (1.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10158 bytes 1314073 (1.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp3s0 给我带来了问题。enp2s0 几乎从不超时。原来的板载 NIC 现已禁用，因此它似乎没有显示在 ifconfig 中。
@heynnema
> lshw -C network
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 07
serial: 1c:fd:08:70:21:73
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8168e-3_0.0.4 03/27/12 ip=10.1.1.182 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:17 ioport:4000(size=256) memory:a2200000-a2200fff memory:a0000000-a0003fff
*-network
description: Ethernet interface
product: Realtek Semiconductor Co., Ltd.
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: enp3s0
version: 15
serial: 00:31:92:46:96:a5
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip=192.168.1.120 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
resources: irq:18 ioport:3000(size=256) memory:a2104000-a2104fff memory:a2100000-a2103fff
*-network DISABLED
description: Ethernet interface
product: Ethernet Connection (7) I219-V
vendor: Intel Corporation
physical id: 1f.6
bus info: pci@0000:00:1f.6
logical name: eno1
version: 10
serial: 2c:f0:5d:98:b6:ee
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi 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=0.2-4 latency=0 link=no multicast=yes port=twisted pair
resources: irq:126 memory:a2300000-a231ffff
@heynnema “您目前有 3 个以太网端口吗……一个板载端口和两个 PCI 端口？”正确。“您是如何禁用板载端口的？” ifconfig eno1 disable “为什么 enp2s0 只以 100Mb 运行？”嗯……我不知道，这可能是谜题的重要部分。它有一条新电缆，我已将其换成另一条新电缆，但没有任何区别。路由器是Linksys WRT3200ACM。