但是今天我 ping 了 baidu 和 github ，结果如下，baidu ttl = 49 、github ttl = 113 。如果按照我的理解，那么到 github 服务器的跳数比 baidu 的少了很多，有点反直觉。目前猜测有 2 个可能：
[ol]
[/ol]
有大佬知道这是为啥吗？
➜ ~ ping baidu.com
PING baidu.com (39.156.66.10) 56(84) bytes of data.
64 bytes from baidu.com (39.156.66.10): icmp_seq=1 ttl=49 time=33.4 ms
64 bytes from baidu.com (39.156.66.10): icmp_seq=2 ttl=49 time=33.5 ms
64 bytes from baidu.com (39.156.66.10): icmp_seq=3 ttl=49 time=33.2 ms
^C
--- baidu.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 33.238/33.385/33.513/0.239 ms
➜ ~
➜ ~
➜ ~
➜ ~ ping github.com
PING github.com (20.205.243.166) 56(84) bytes of data.
64 bytes from github.com (20.205.243.166): icmp_seq=1 ttl=113 time=80.5 ms
64 bytes from github.com (20.205.243.166): icmp_seq=2 ttl=113 time=79.9 ms
64 bytes from github.com (20.205.243.166): icmp_seq=3 ttl=113 time=79.7 ms
64 bytes from github.com (20.205.243.166): icmp_seq=4 ttl=113 time=80.2 ms
^C
--- github.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3006ms
rtt min/avg/max/mdev = 79.788/80.139/80.547/0.407 ms
➜ ~
