显示*号就是这个节点没有任何回应呗，可能是防火墙挡掉了，可以换用不用的 probe 方式，比如-I 或者-T 试试

From `man traceroute`：
This program attempts to trace the route an IP packet would follow to some internet host by launching probe packets with a small ttl (time to live) then listening for an ICMP "time exceeded" reply from a gateway. We start our probes with a ttl of one and increase by one until we get an ICMP "port unreachable" (or TCP reset), which means we got to the "host", or hit a max (which defaults to 30 hops). Three probes (by default) are sent at each ttl setting and a line is printed showing the ttl, address of the gateway and round trip time of each probe. The address can be followed by addi‐ tional information when requested. If the probe answers come from different gateways, the address of each responding system will be printed. If there is no response within a certain timeout, an "*" (asterisk) is printed for that probe.