TCP IP Illustrated

1055 bsdiecho ack 14 svr4 echo bsdi1055 ack 14 arp

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Unformatted text preview: echoed hello, world disconnect Ethernet cable after 4 hours this happens about 6 hours and 10 minutes after read error: Connection start timed out Figure 23.1 shows the tcpdump output. (We have removed the connection establishment and the window advertisements.) 1 0.0 2 0.006105 ( 0.0061) 3 0.093140 ( 0.0870) 7199.972793 (7199.8797) 7199.974878 ( 0.0021) 7199.975741 ( 0.0009) 7199.979843 ( 0.0041) 14400.134330 (7200.1545) 14400.136452 ( 0.0021) 14400.137391 ( 0.0009) 14400.141408 ( 0.0040) 21600.318309 (7200.1769) 21675.320373 ( 75.0021) 21750.322407 ( 75.0020) 4 5 6 7 8 9 10 11 12 13 14 bsdi.1055 > bsdi.echo : P 1:14(13) ack 1 bsdi.echo > bsdi.1055 : P 1:14(13) ack 14 bsdi.1055 > svr4 .echo : . ack 14 arp who-has svr4 tell bsdi arp reply svr4 is-at 0:0:c0: c2:9b:26 bsdi.1055 > bsdi.echo : . ack 14 svr4 .echo > bsdi.1055 : . ack 14 arp who-has svr4 tell bsdi arp reply svr4 is-at 0:0:c0: c2:9b:26 bsdi.1055 > bsdi.echo : . ack 14 bsdi.echo > bsdi.1055 : . ack 14 arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi file:///D|/Documents%20and%20Settings/bigini/Docum.../homenet2run/tcpip/tcp-ip-illustrated/tcp_keep.htm (4 of 9) [12/09/2001 14.47.30] Chapter 23. TCP Keepalive Timer 15 16 17 18 19 20 21 21825.324460 75.0021) 21900.436749 75.1123) 21975.438787 75.0020) 22050.440842 75.0021) 22125.432883 74.9920) 22200.434697 75.0018) 22275.436788 75.0021) ( ( ( ( ( ( ( arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi arp who-has svr4 tell bsdi Figure 23.1 Keepalive packets that determine that a host has crashed. Lines 1, 2, and 3 send the line "hello, world" from the client to the server and back. The first keepalive probe occurs 2 hours (7200 seconds) later on line 4. The first thing we see is an ARP request and an ARP reply, before the TCP segment on line 6 can be sent. The keepalive probe on line 6 elicits a response from the other end (line 7). The same s...
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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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