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<HTML
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>Timers</TITLE
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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
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><B
>Note</B
></TH
></TR
><TR
><TD
> </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
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></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
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><P
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><B
>Note</B
></TH
></TR
><TR
><TD
> </TD
><TD
ALIGN="LEFT"
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><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
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