TCP IP Illustrated

Tcpoutrsts counter total number of segments sent with

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Unformatted text preview: unter Number of transitions from SYNSENT or SYNRCVD to CLOSED, plus number of transitions from SYNRCVD to LISTEN. tcpEstabResets Counter Number of transitions from ESTABLISHED or CLOSEWAIT states to CLOSED. tcpCurrEstab Gauge Number of connections currently in ESTABLISHED or CLOSEWAIT states. tcpInSegs Counter Total number of segments received. tcpOutSegs Counter Total number of segments sent, excluding those containing only retransmitted bytes. tcpRetransSegs Counter Total number of retransmitted segments. tcpInErrs Counter Total number of segments received with an error (such as invalid checksum). tcpOutRsts Counter Total number of segments sent with RST flag set. Figure 25.27 Simple variables in tcp group. We can query some of these variables on the system sun: sun % snmpi -a sun snmpi> get tcpRtoAlgorithm.0 tcpRtoMin.0 tcpRtoMax.0 tcpMaxConn.0 tcpRtoAlgorithm.0=vanj(4) tcpRtoMin.0=200 tcpRtoMax.O=12800 tcpMaxConn.0=-1 file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (24 of 33) [12/09/2001 14.47.40] Chapter 25. SNMP: Simple Network Management Protocol This system (SunOS 4.1.3) uses the Van Jacobson retransmission timeout algorithm, uses timeouts between 200 ms and 12.8 seconds, and has no fixed limit on the number of TCP connections. (This upper limit of 12.8 seconds appears wrong, since most implementations use an upper limit of 64 seconds, as we saw in Chapter 21.) The tcp group has a single table, the TCP connection table, shown in Figure 25.28. This contains one row for each connection. Each row contains five variables; the state of the connection, local IP address, local port number, remote IP address, and remote port number. index = < tcpConnLocalAddress >.< tcpConnLocalPort >.< tcpConnRemAddress >.< tcpConnRemPort > Name Datatype [1..12] tcpConnState tcpConnLocalAddress IpAddress R/W Description * State of connection: 1 = CLOSED, 2 = LISTEN, 3 = SYNSENT, 4 = SYNRCVD, 5 = ESTABLISHED, 6 = FINWAIT1,7= FINWAI...
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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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