File: timers.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML
><HEAD
><TITLE
>Timers</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"><LINK
REL="HOME"
TITLE="IPTraf User's Manual"
HREF="manual.html"><LINK
REL="UP"
TITLE="Configuring IPTraf"
HREF="config.html"><LINK
REL="PREVIOUS"
TITLE="Configuring IPTraf"
HREF="config.html"><LINK
REL="NEXT"
TITLE="Custom Information"
HREF="customports.html"></HEAD
><BODY
CLASS="SECT1"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>IPTraf User's Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="config.html"
>&#60;&#60;&#60; Previous</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Configuring IPTraf</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="customports.html"
>Next &#62;&#62;&#62;</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="TIMERS"
>Timers</A
></H1
><P
>  The <I
CLASS="EMPHASIS"
>Timers...</I
> submenu allows you to IPTraf's
  interval and timeout functions.</P
><DIV
CLASS="FIGURE"
><A
NAME="AEN2027"
></A
><P
><IMG
SRC="iptraf-timermenu.png"></P
><P
><B
>Figure 2. The Timers configuration submenu</B
></P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN2030"
>TCP Timeout</A
></H2
><P
>  This figure determines the amount of time (in minutes) a
  connection entry may remain idle before it becomes
  eligible for replacement by a new connection. The default is 15 minutes.
  You may want to reduce this on an isolated (not connected
  to the Internet) LAN or a LAN connected to the Internet with
  high-speed links. Just enter the new value and press
  Enter. You can press Ctrl+X to leave the current value unchanged.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN2033"
>Log Interval</A
></H2
><P
>  This figure determines the number of minutes between logging
  of interface statistics, TCP/UDP figures, and LAN host statistics. The
  default is 60 minutes. This figure is meaningless if logging is disabled.</P
><P
>  This configuration item can be overridden with the <TT
CLASS="COMPUTEROUTPUT"
>-I</TT
> when
  a facility is directly invoked from the command line (not accessed via the main menu), and
  remains effective for that particular session.  The configured value is not affected.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN2038"
>Screen Update Interval</A
></H2
><P
>  This value determines the rate in seconds at which the screen is
  updated. The default is 0, which means the screen is updated as fast
  as possible, giving close-to-realtime reflection
  of network activity. However, this high-speed update can cause
  incredible amounts of traffic if IPTraf is run on a remote
  terminal (e.g. a Telnet or Secure Shell session). You can set this
  to a higher value, such as 1 or 2 seconds to slow down the updates.</P
><P
>  This figure does not affect the rate of data capture. Only the
  screen refresh is affected. The figures are still updated as fast as
  possible, although the figure display will no longer be as close
  to realtime.</P
><P
>  The default setting is 0, which shouldn't be a problem on the
  console. Set it to a slightly higher value on remote terminals or slow
  links. The setting affects all monitoring facilities.</P
><DIV
CLASS="NOTE"
><P
></P
><TABLE
CLASS="NOTE"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="./stylesheet-images/note.gif"
HSPACE="5"
ALT="Note"></TD
><TH
ALIGN="LEFT"
VALIGN="CENTER"
><B
>Note</B
></TH
></TR
><TR
><TD
>&nbsp;</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>   Updating the screen is one of the slowest operations in a
  program. Older versions of IPTraf had a problem once network
  activity became very high. Because each packet caused a screen update,
  IPTraf began spending more time with the screen updates, causing a loss
  of packets once network activity reached a certain point.</P
><P
>  However, since many users like rapid counts on their screen, a
  compromise was incorporated. Even when the screen update interval is set
  to 0, there is still a 50ms delay between screen updates (except the LAN
  station monitor, which has a 100 ms delay). This is still visually fast,
  but provides more time to the packet capture routine. Higher
  delays may result in better accuracy of counts and activity.</P
><P
>  In any case, this setting only affects screen updates. Capture still
  proceeds as fast as possible.</P
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN2048"
>TCP closed/idle persistence</A
></H2
><P
>  This parameter
  determines the interval (in minutes) at which the IP Traffic Monitor
  clears from the TCP display window all closed, idle, and timed out
  entries. Enter <TT
CLASS="COMPUTEROUTPUT"
>0</TT
> to keep such entries on the
  screen indefinitely, disappearing only when replaced by new connections.</P
><DIV
CLASS="NOTE"
><P
></P
><TABLE
CLASS="NOTE"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="./stylesheet-images/note.gif"
HSPACE="5"
ALT="Note"></TD
><TH
ALIGN="LEFT"
VALIGN="CENTER"
><B
>Note</B
></TH
></TR
><TR
><TD
>&nbsp;</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>  The <I
CLASS="EMPHASIS"
>TCP timeout...</I
> option
  only tells IPTraf how long it should take before a connection should
  be considered idle and open to replacement by new connections. This does
  not determine how long
  it remains onscreen. The <I
CLASS="EMPHASIS"
>TCP closed/idle
  persistence...</I
> 
   parameter flushes entries that have been closed or reset, or idle for the number
  of minutes defined by the <I
CLASS="EMPHASIS"
>TCP timeout...</I
> option.</P
></TD
></TR
></TABLE
></DIV
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="config.html"
>&#60;&#60;&#60; Previous</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="manual.html"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="customports.html"
>Next &#62;&#62;&#62;</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Configuring IPTraf</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="config.html"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Custom Information</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>