在我的 LAN 中，我有几个设备和工作站。工作站运行 Linux，能够毫无问题地访问 WAN。突然，我的一个工作站无法再访问 WAN，但可以访问 LAN。除了基本的 apt-get 更新和升级之外，没有进行任何重大配置更改。
使用的路由器是TL-WR841N。
执行 tcpdump 显示与 WAN 连接的数据包丢失率为 100％。
可以 ping 通 LAN 中的任何其他主机（包括网关）。但 ping 通 google.com 或 8.8.8.8 之类的地址则不起作用。
可能是什么原因造成此问题以及如何解决。
编辑：升级包
Start-Date: 2016-12-01 22:08:08
Commandline: apt-get upgrade
Upgrade: libpython2.7-stdlib:amd64 (2.7.6-8ubuntu0.2, 2.7.6-8ubuntu0.3), python-samba:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), gstreamer0.10-plugins-good:i386 (0.10.3
1-3+nmu1ubuntu5, 0.10.31-3+nmu1ubuntu5.2), gstreamer0.10-plugins-good:amd64 (0.10.31-3+nmu1ubuntu5, 0.10.31-3+nmu1ubuntu5.2), isc-dhcp-common:amd64 (4.2.4-7ubuntu12.7, 4.2.4-7ubuntu12.8), firef
ox-locale-en:amd64 (49.0.2+linuxmint1+rosa, 50.0+linuxmint1+rosa), python3.4:amd64 (3.4.3-1ubuntu1~14.04.4, 3.4.3-1ubuntu1~14.04.5), vim-common:amd64 (7.4.052-1ubuntu3, 7.4.052-1ubuntu3.1), fir
efox:amd64 (49.0.2+linuxmint1+rosa, 50.0+linuxmint1+rosa), samba:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), python3.4-minimal:amd64 (3.4.3-1ubuntu1~14.04.4, 3.4.3-1ubun
tu1~14.04.5), libgs9-common:amd64 (9.10~dfsg-0ubuntu10.4, 9.10~dfsg-0ubuntu10.5), libpython3.4-stdlib:amd64 (3.4.3-1ubuntu1~14.04.4, 3.4.3-1ubuntu1~14.04.5), python2.7:amd64 (2.7.6-8ubuntu0.2,
2.7.6-8ubuntu0.3), libpython3.4:amd64 (3.4.3-1ubuntu1~14.04.4, 3.4.3-1ubuntu1~14.04.5), gstreamer1.0-tools:amd64 (1.2.4-0ubuntu1, 1.2.4-0ubuntu1.1), gstreamer0.10-pulseaudio:amd64 (0.10.31-3+nm
u1ubuntu5, 0.10.31-3+nmu1ubuntu5.2), samba-dsdb-modules:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), ghostscript-x:amd64 (9.10~dfsg-0ubuntu10.4, 9.10~dfsg-0ubuntu10.5), l
ibpython3.4-minimal:amd64 (3.4.3-1ubuntu1~14.04.4, 3.4.3-1ubuntu1~14.04.5), samba-common-bin:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), libpython2.7-dev:amd64 (2.7.6-8u
buntu0.2, 2.7.6-8ubuntu0.3), libmagickwand5:amd64 (6.7.7.10-6ubuntu3.1, 6.7.7.10-6ubuntu3.3), libc-ares2:amd64 (1.10.0-2, 1.10.0-2ubuntu0.1), vim-tiny:amd64 (7.4.052-1ubuntu3, 7.4.052-1ubuntu3.
1), samba-libs:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), libpython2.7:amd64 (2.7.6-8ubuntu0.2, 2.7.6-8ubuntu0.3), gstreamer0.10-gconf:amd64 (0.10.31-3+nmu1ubuntu5, 0.1
0.31-3+nmu1ubuntu5.2), imagemagick:amd64 (6.7.7.10-6ubuntu3.1, 6.7.7.10-6ubuntu3.3), isc-dhcp-client:amd64 (4.2.4-7ubuntu12.7, 4.2.4-7ubuntu12.8), gstreamer1.0-pulseaudio:amd64 (1.2.4-1~ubuntu1
, 1.2.4-1~ubuntu1.3), smbclient:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), libgstreamer-plugins-good1.0-0:amd64 (1.2.4-1~ubuntu1, 1.2.4-1~ubuntu1.3), vim:amd64 (7.4.052
-1ubuntu3, 7.4.052-1ubuntu3.1), libgs9:amd64 (9.10~dfsg-0ubuntu10.4, 9.10~dfsg-0ubuntu10.5), libgstreamer1.0-0:amd64 (1.2.4-0ubuntu1, 1.2.4-0ubuntu1.1), libgstreamer1.0-0:i386 (1.2.4-0ubuntu1,
1.2.4-0ubuntu1.1), gstreamer1.0-plugins-good:amd64 (1.2.4-1~ubuntu1, 1.2.4-1~ubuntu1.3), python2.7-minimal:amd64 (2.7.6-8ubuntu0.2, 2.7.6-8ubuntu0.3), libmagickcore5:amd64 (6.7.7.10-6ubuntu3.1,
6.7.7.10-6ubuntu3.3), gir1.2-gstreamer-1.0:amd64 (1.2.4-0ubuntu1, 1.2.4-0ubuntu1.1), imagemagick-common:amd64 (6.7.7.10-6ubuntu3.1, 6.7.7.10-6ubuntu3.3), libwbclient0:amd64 (4.3.11+dfsg-0ubunt
u0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), linux-libc-dev:amd64 (3.13.0-101.148, 3.13.0-103.150), libc-ares-dev:amd64 (1.10.0-2, 1.10.0-2ubuntu0.1), ghostscript:amd64 (9.10~dfsg-0ubuntu10.4, 9.
10~dfsg-0ubuntu10.5), samba-common:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), libpython2.7-minimal:amd64 (2.7.6-8ubuntu0.2, 2.7.6-8ubuntu0.3), vim-runtime:amd64 (7.4.05
2-1ubuntu3, 7.4.052-1ubuntu3.1), libsmbclient:amd64 (4.3.11+dfsg-0ubuntu0.14.04.1, 4.3.11+dfsg-0ubuntu0.14.04.3), tar:amd64 (1.27.1-1, 1.27.1-1ubuntu0.1)
End-Date: 2016-12-01 22:09:34
Start-Date: 2016-12-04 18:35:03
Commandline: apt-get upgrade
Upgrade: firefox-locale-en:amd64 (50.0+linuxmint1+rosa, 50.0.2+linuxmint1+rosa), google-chrome-stable:amd64 (54.0.2840.100-1, 55.0.2883.75-1), ubuntu-drivers-common:amd64 (0.2.91.4linuxmint1, 0
.2.91.12linuxmint1), firefox:amd64 (50.0+linuxmint1+rosa, 50.0.2+linuxmint1+rosa)
End-Date: 2016-12-04 18:35:25
答案1
问题出在路由器上。通过刷新 OpenWRT 解决了该问题。