TCP IP Illustrated

2521334 icmpseq1 time4 ms 64 bytes from svr4

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Unformatted text preview: 0.252.13.34): icmp_seq=1. time=4. ms 64 bytes from svr4 (140.252.13.34): icmp_seq=2. time=4. ms 64 bytes from svr4 (140.252.13.34): icmp_seq=3. time=4. ms ^? type interrupt key to stop ---svr4 PING Statistics--4 packets transmitted, 4 packets received, 0% packet loss round-trip (ms) min/avg/max = 4/4/7 The additional 3 ms in the first RTT is probably for the ARP request and reply This example was run on the host sun, which provides a timer with microsecond resolution, but the ping program prints the round-trip times with only millisecond resolution. The earlier example, run under BSD/386 Version 0.9.4, printed the round-trip times as 0 ms, since the available timer provided only IO-ms accuracy. The following output is from BSD/386 Version 1.0, which provides a timer with microsecond resolution and a version of ping that prints the higher resolution. bsdi % ping svr4 PING svr4 (140.252.13.34): 56 data bytes 64 bytes from 140.252.13.34: icmp_seq=0 ttl=255 time=9.304 64 bytes from 140.252.13.34: icmp_seq=1 ttl=255 time=6.089 64 bytes from 140.252.13.34: icmp_seq=2 ttl=255 time=6.079 64 bytes from 140.252.13.34: icmp_seq=3 ttl=255 time=6.096 ^? type interrupt key to stop --- svr4 ping statistics --4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 6.079/6.880/9.304 ms ms ms ms ms file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/pingprog.htm (4 of 13) [12/09/2001 14.46.45] Chapter 7. Ping Program WAN Output On a wide area network the results can be quite different. The following example was captured on a weekday afternoon, a time when the Internet is normally busy: gemini % ping vangogh.cs.berkeley.edu PING vangogh.cs.berkeley.edu: 56 data bytes 64 bytes from (128.32.130.2): icmp_seq=0. time=660. ms 64 bytes from (128.32.130.2): icmp_seq=5. time=1780. ms 64 bytes from (128.32.130.2): icmp_seq=7. time=380. ms 64 bytes from (128.32.130.2): icmp_seq=8. time=420. ms 64 bytes from (128.32.130.2): icmp_seq=9. t...
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.

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