1 <1 ms <1 ms 3 ms 192.168.0.1 2 75 ms 71 ms 73 ms reserve.cableplus.com.cn [126.96.36.199] 3 61 ms 133 ms 140 ms 188.8.131.52
什么是75 ms 71 ms 73 ms意味着什么？从 man page of traceroute：
This program attempts to trace theroute an IP packet would follow to some internet host by launching UDP 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” (which means we got to “host”) or hit a max (which defaults to 30 hops & can be changed with the -m flag). Three probes (change with -q flag) 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.
因此,75 ms 71 ms 73 ms代表每个不同探头所用的往返时间.