Introduction; Tcp Main Window; Retransmit-Timeout Algorithm (Tcprtoalgorithm); Retransmit-Timeout Minimum (Tcprtomin) - Patton electronics Model 2604 Administrator's Reference Manual

11 • TCP T1/E1 DACS Administrators' Reference Guide

Introduction

Transmission Control Protocol (TCP) is in the Transport layer of the OSI model and sits on top of IP. It is one
of the more widely used protocols among the TCP/IP suite. The TCP subsystem web pages of the 2604
DACS provides management and statistical information on TCP. Detailed information regarding the SNMP
MIB variables may be downloaded from RFC1213: Management Information Base for Network Management
of TCP/IP-based internets: MIB-II.
TCP Configuration Menu TCP
Click on under the to display the main window (see figure 28) to monitor TCP
statistics.
Figure 28. TCP main window

TCP main window

Retransmit-Timeout Algorithm (tcpRtoAlgorithm)

The algorithm that determines the timeout value used for retransmitting unacknowledged octets.

Retransmit-Timeout Minimum (tcpRtoMin)

The minimum value permitted by a TCP implementation for the retransmission timeout, measured in milli-
seconds. More refined semantics for objects of this type depend upon the algorithm used to determine the
retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the
semantics of the LBOUND quantity described in RFC 793.

Retransmit-Timeout Maximum (tcpRtoMax)

The maximum value permitted by a TCP implementation for the retransmission timeout, measured in milli-
seconds. More refined semantics for objects of this type depend upon the algorithm used to determine the
retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the
semantics of the UBOUND quantity described in RFC 793.
74 Introduction