这是一个创建于 1644 天前的主题，其中的信息可能已经有所发展或是发生改变。
一段 ping 命令的执行返回：
[root@node1 ~]# ping baidu.com PING baidu.com (220.181.38.148) 56(84) bytes of data. 64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=1 ttl=49 time=35.9 ms 64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=2 ttl=49 time=67.4 ms 64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=3 ttl=49 time=37.6 ms ^C --- baidu.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 35.947/47.022/67.444/14.457 ms [root@node1 ~]# ping github.com PING github.com (13.229.188.59) 56(84) bytes of data. 64 bytes from ec2-13-229-188-59.ap-southeast-1.compute.amazonaws.com (13.229.188.59): icmp_seq=1 ttl=42 time=121 ms 64 bytes from ec2-13-229-188-59.ap-southeast-1.compute.amazonaws.com (13.229.188.59): icmp_seq=2 ttl=42 time=119 ms 64 bytes from ec2-13-229-188-59.ap-southeast-1.compute.amazonaws.com (13.229.188.59): icmp_seq=3 ttl=42 time=126 ms ^C --- github.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2003ms rtt min/avg/max/mdev = 119.436/122.369/126.585/3.069 ms [root@node1 ~]# 疑问的是 ping github 的返回中 ec2-13-229-188-59.ap-southeast-1.compute.amazonaws.com 是拿来的，ping 返回的数据格式怎么理解？
4 条回复 2021-06-17 15:11:10 +08:00
 | 1 013231 2021-06-17 14:57:32 +08:00 IP 地址 Reverse DNS 的结果 |
 | 2 miaomiao888 2021-06-17 14:58:42 +08:00 CNAME |
| 3 miaomiao888 2021-06-17 15:03:18 +08:00 @miaomiao888 错了，这么长还带 IP 的是 rDNS |
 | 4 thunderw 2021-06-17 15:11:10 +08:00 这个叫做 PTR (DNS Pointer Record)记录 59.188.229.13.in-addr.arpa name = ec2-13-229-188-59.ap-southeast-1.compute.amazonaws.com. |
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