服务器网络有故障了，专门去了一趟老校区来修理。
到了机房，
ifconfig 查看网络接口的状态。恩，大致是这样：
vvl@xdlinux:~$ ifconfig
docker0 Link encap:Ethernet HWaddr 02:42:1a:1b:75:06
inet addr:172.17.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::1/64 Scope:Link
inet6 addr: fe80::42:1aff:fe1b:7506/64 Scope:Link
inet6 addr: fdbd:6b69:4dc6::1/48 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:162393390 errors:0 dropped:0 overruns:0 frame:0
TX packets:331323123 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:12041875764 (11.2 GiB) TX bytes:498767843534 (464.5 GiB)
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:2238346 errors:0 dropped:0 overruns:0 frame:0
TX packets:2238346 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:377411960 (359.9 MiB) TX bytes:377411960 (359.9 MiB)
显然网卡没启动，
/etc/init.d/networking 走起。=_= 没有任何输出信息… 诶，那就手动启动吧。ifconfig ethx up ~ 再 ifconfig，大致是这样的输出：
vvl@xdlinux:~$ ifconfig
docker0 Link encap:Ethernet HWaddr 02:42:1a:1b:75:06
inet addr:172.17.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::1/64 Scope:Link
inet6 addr: fe80::42:1aff:fe1b:7506/64 Scope:Link
inet6 addr: fdbd:6b69:4dc6::1/48 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:162393390 errors:0 dropped:0 overruns:0 frame:0
TX packets:331323123 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:12041875764 (11.2 GiB) TX bytes:498767843534 (464.5 GiB)
eth0 Link encap:Ethernet HWaddr 48:5b:39:b8:37:0d
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:332151441 errors:0 dropped:66005 overruns:0 frame:0
TX packets:162917713 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:502086864230 (467.6 GiB) TX bytes:15667890997 (14.5 GiB)
eth1 Link encap:Ethernet HWaddr 00:23:7d:6d:50:9d
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:35736452 errors:1 dropped:22061 overruns:0 frame:1
TX packets:129046572 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2719695714 (2.5 GiB) TX bytes:192402119248 (179.1 GiB)
Interrupt:19
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:2238346 errors:0 dropped:0 overruns:0 frame:0
TX packets:2238346 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:377411960 (359.9 MiB) TX bytes:377411960 (359.9 MiB)
ps: 忽略 RX/TX bytes… 不要在意细节。再说，我也不知道是不是这样的输出，我是根据
ip addr 看出问题的～！
2: enp3s0: mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 94:de:80:af:d8:39 brd ff:ff:ff:ff:ff:ff
inet 10.170.41.48/16 brd 10.170.255.255 scope global dynamic enp3s0
valid_lft 246001sec preferred_lft 246001sec
inet6 2001:250:1006:dff0::1:67a2/128 scope global dynamic
valid_lft 245998sec preferred_lft 159598sec
inet6 fe80::13e0:ea7:7fe3:d7b3/64 scope link
valid_lft forever preferred_lft forever
输出差不多是上面那样，注意
sudo pon dsl-provider 成功拨号，手动添加 IP 地址、路由，成功。此时就剩下一个问题了：/etc/init.d/networking 启动脚本怎么了？
先从自己正常工作的腾讯云上 download 下来一个，diff 二者，没问题。思考，这是怎么了呢？后来想到，
ifupdown 这个工具是用来管理网络接口的，是不是他们出问题了呢？尝试搜了一下这个包：
vvl@xdlinux:~$ apt search ifupdown
Sorting... Done
Full Text Search... Done
guessnet/stable 0.56 amd64
Guess which LAN a network device is connected to
ifupdown/stable,now 0.7.53.1 amd64 [...]
high level tools to configure network interfaces
ifupdown-extra/stable 0.25 all
Network scripts for ifupdown
ifupdown-multi/stable 0.1.1 all
multiple default gateway support for ifupdown
ifupdown-scripts-zg2/stable 0.6-1 all
Zugschlus' interface scripts for ifupdown's manual method
netscript-ipfilter/stable 5.4.10 all
Linux 2.6/3.x iptables management system.
哇，还真有这个包，
[...] 内容我忘记了，反正不是正常安装 [installed]。重新安装之，重启，搞定。
很奇怪：这个包是怎么损坏的呢？一个玄学…
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