我在笔记本电脑上运行 Ubuntu 16.04，我的 wifi 出现了一些问题。局域网工作正常，但几周以来，即使我已连接到网络，也无法通过 wifi ping 通。但这只是在工作时。在家里，我的 wifi 工作正常。
~$ sudo lshw -class network
*-network
description: Wireless interface
product: Wireless 8260
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlp2s0
version: 3a
serial: e4:a4:71:c8:11:85
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.4.0-131-generic firmware=16.242414.0 ip=10.0.204.40 latency=0 link=yes multicast=yes wireless=IEEE 802.11abg
resources: irq:132 memory:e2100000-e2101fff
*-network
description: Ethernet interface
product: Ethernet Connection I219-LM
vendor: Intel Corporation
physical id: 1f.6
bus info: pci@0000:00:1f.6
logical name: enp0s31f6
version: 21
serial: 28:f1:0e:2b:46:2c
size: 1Gbit/s
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 duplex=full firmware=0.13-3 ip=10.0.202.169 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:128 memory:e2200000-e221ffff
*-network
description: Ethernet interface
physical id: 2
logical name: wwp0s20f0u2i12
serial: 52:0a:43:cf:57:5a
capabilities: ethernet physical
configuration: broadcast=yes driver=cdc_mbim driverversion=22-Aug-2005 firmware=CDC MBIM link=yes multicast=yes
~$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
From 10.0.202.169 icmp_seq=2 Destination Host Unreachable
From 10.0.202.169 icmp_seq=3 Destination Host Unreachable
From 10.0.202.169 icmp_seq=4 Destination Host Unreachable
--- 8.8.8.8 ping statistics ---
6 packets transmitted, 0 received, +3 errors, 100% packet loss, time 5009ms
pipe 3
~$ifconfig
br-d014c58f4909 Link encap:Ethernet HWaddr 02:42:26:ac:f4:62
inet addr:172.19.0.1 Bcast:172.19.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
br-e0a7201ce52f Link encap:Ethernet HWaddr 02:42:99:b0:73:bf
inet addr:172.18.0.1 Bcast:172.18.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
docker0 Link encap:Ethernet HWaddr 02:42:af:04:2d:78
inet addr:172.17.0.1 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
enp0s31f6 Link encap:Ethernet HWaddr 28:f1:0e:2b:46:2c
inet addr:10.0.202.169 Bcast:10.0.207.255 Mask:255.255.248.0
inet6 addr: fe80::2af1:eff:fe2b:462c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:45843 errors:0 dropped:0 overruns:0 frame:0
TX packets:19772 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:30767933 (30.7 MB) TX bytes:3004989 (3.0 MB)
Interrupt:16 Memory:e2200000-e2220000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:1371 errors:0 dropped:0 overruns:0 frame:0
TX packets:1371 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:153287 (153.2 KB) TX bytes:153287 (153.2 KB)
wlp2s0 Link encap:Ethernet HWaddr e4:a4:71:c8:11:85
inet addr:10.0.204.40 Bcast:10.0.207.255 Mask:255.255.248.0
inet6 addr: fe80::e6a4:71ff:fec8:1185/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:16940 errors:0 dropped:0 overruns:0 frame:0
TX packets:1105 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2726169 (2.7 MB) TX bytes:133610 (133.6 KB)
wwp0s20f0u2i12 Link encap:Ethernet HWaddr 52:0a:43:cf:57:5a
inet6 addr: fe80::500a:43ff:fecf:575a/64 Scope:Link
UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:89 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:21384 (21.3 KB)
~$ rfkill list all
1: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
2: dell-bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
3: dell-wwan: Wireless WAN
Soft blocked: yes
Hard blocked: no
4: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
~$ ip route
default via 10.0.200.1 dev enp0s31f6
default via 10.0.200.1 dev wlp2s0 proto static metric 600
10.0.200.0/21 dev enp0s31f6 proto kernel scope link src 10.0.202.169
10.0.200.0/21 dev wlp2s0 proto kernel scope link src 10.0.204.40 metric 600
169.254.0.0/16 dev br-e0a7201ce52f scope link metric 1000
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
172.18.0.0/16 dev br-e0a7201ce52f proto kernel scope link src 172.18.0.1
172.19.0.0/16 dev br-d014c58f4909 proto kernel scope link src 172.19.0.1 linkdown