PING tc.forward.douban.com (81.70.124.99) 56(84) bytes of data.
64 bytes from 81.70.124.99 (81.70.124.99): icmp_seq=1 ttl=52 time=264 ms
64 bytes from 81.70.124.99 (81.70.124.99): icmp_seq=2 ttl=52 time=263 ms
64 bytes from 81.70.124.99 (81.70.124.99): icmp_seq=3 ttl=52 time=263 ms

--- tc.forward.douban.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 263.002/263.747/264.824/0.779 ms