尝试 ping dynazu.com 得到的结果为：joel@laptop:~$ sudo ping dynazu.com PING dynazu.com(2600:3c01::f03c:92ff:fe3b:2efa) 56 个数据字节并且永不完成...
Ifconfig 给出：
joel@laptop:~$ ifconfig -a
enp59s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 80:fa:5b:4d:02:1c txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
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 75393 bytes 6750015 (6.7 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 75393 bytes 6750015 (6.7 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp61s0: 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::8c22:f09:2f43:7d37 prefixlen 64 scopeid 0x20<link>
inet6 2601:283:8100:e47:786d:47ae:6c34:cfd7 prefixlen 64 scopeid 0x0<global>
inet6 2601:283:8100:e47:18e4:8d44:9b2a:9a3f prefixlen 64 scopeid 0x0<global>
inet6 2601:283:8100:e47:9535:577e:659b:1303 prefixlen 64 scopeid 0x0<global>
ether 44:03:2c:64:ee:0c txqueuelen 1000 (Ethernet)
RX packets 1933500 bytes 1593080389 (1.5 GB)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 1176044 bytes 267935104 (267.9 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
正如预期的那样。traceroot 给出：
traceroute -n www.google.com
traceroute to www.google.com (172.217.12.4), 30 hops max, 60 byte packets
1 192.168.1.1 1.495 ms 1.529 ms 1.483 ms
2 96.120.13.9 16.368 ms 16.282 ms 16.257 ms
3 96.110.194.213 18.913 ms 18.979 ms 21.256 ms
4 68.85.89.189 14.760 ms 16.986 ms 14.663 ms
5 68.86.92.121 19.538 ms 19.506 ms 19.489 ms
6 68.86.83.94 19.379 ms 18.511 ms 18.397 ms
7 23.30.207.162 15.685 ms 23.30.206.218 13.349 ms 50.248.118.30 13.242 ms
8 * * 108.170.252.193 11.894 ms
9 216.239.49.41 18.998 ms 18.967 ms 216.239.49.43 17.238 ms
10 172.217.12.4 17.138 ms 216.239.49.43 17.598 ms 172.217.12.4 16.329 ms
正如预期的那样。
网站：Dynazu.com 位于 ip4:45.33.111.61 和 pi6: 2600:3c01::f03c:92ff:fe3b:2efa
ping 45.33.111.61 结果为：
joel@laptop:~$ ping 45.33.111.61
ping: socket: Operation not permitted
joel@laptop:~$ sudo ping 45.33.111.61 得到：
PING 45.33.111.61 (45.33.111.61) 56(84) bytes of data.
64 bytes from 45.33.111.61: icmp_seq=1 ttl=51 time=40.1 ms
64 bytes from 45.33.111.61: icmp_seq=2 ttl=51 time=40.3 ms
64 bytes from 45.33.111.61: icmp_seq=3 ttl=51 time=39.8 ms
64 bytes from 45.33.111.61: icmp_seq=4 ttl=51 time=40.3 ms
那么为什么 ping 身份验证会失败？
ping 2600:3c01::f03c:92ff:fe3b:2efa 结果为：
ping: socket: Operation not permitted
sudo ping 2600：3c01::f03c:92ff:fe3b:2efa 给出：
joel@laptop:~$ sudo ping 2600:3c01::f03c:92ff:fe3b:2efa
PING 2600:3c01::f03c:92ff:fe3b:2efa(2600:3c01::f03c:92ff:fe3b:2efa) 56 data bytes
仅此而已。
有任何想法吗？
答案1
找出 ping 包的位置。它可能位于不同的位置。在我的 Ubuntu 18.04 机器上，它位于/bin。使用type -a ping来找到它。接下来，验证它是否存在并且归其所有root且权限为 755（或类似）
ls -lsa /bin/ping
sudo chmod 4711 /bin/ping
验证修复是否有效ls -lsa /bin/ping
ping 2600:3c01::f03c:92ff:fe3b:2efa