Documentation/timers.html

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  70 CLASS="SECT1"
  71 ><H1
  72 CLASS="SECT1"
  73 ><A
  74 NAME="TIMERS"
  75 >Timers</A
  76 ></H1
  77 ><P
  78 >  The <I
  79 CLASS="EMPHASIS"
  80 >Timers...</I
  81 > submenu allows you to IPTraf's
  82   interval and timeout functions.</P
  83 ><DIV
  84 CLASS="FIGURE"
  85 ><A
  86 NAME="AEN2027"
  87 ></A
  88 ><P
  89 ><IMG
  90 SRC="iptraf-timermenu.png"></P
  91 ><P
  92 ><B
  93 >Figure 2. The Timers configuration submenu</B
  94 ></P
  95 ></DIV
  96 ><DIV
  97 CLASS="SECT2"
  98 ><H2
  99 CLASS="SECT2"
 100 ><A
 101 NAME="AEN2030"
 102 >TCP Timeout</A
 103 ></H2
 104 ><P
 105 >  This figure determines the amount of time (in minutes) a
 106   connection entry may remain idle before it becomes
 107   eligible for replacement by a new connection. The default is 15 minutes.
 108   You may want to reduce this on an isolated (not connected
 109   to the Internet) LAN or a LAN connected to the Internet with
 110   high-speed links. Just enter the new value and press
 111   Enter. You can press Ctrl+X to leave the current value unchanged.</P
 112 ></DIV
 113 ><DIV
 114 CLASS="SECT2"
 115 ><H2
 116 CLASS="SECT2"
 117 ><A
 118 NAME="AEN2033"
 119 >Log Interval</A
 120 ></H2
 121 ><P
 122 >  This figure determines the number of minutes between logging
 123   of interface statistics, TCP/UDP figures, and LAN host statistics. The
 124   default is 60 minutes. This figure is meaningless if logging is disabled.</P
 125 ><P
 126 >  This configuration item can be overridden with the <TT
 127 CLASS="COMPUTEROUTPUT"
 128 >-I</TT
 129 > when
 130   a facility is directly invoked from the command line (not accessed via the main menu), and
 131   remains effective for that particular session.  The configured value is not affected.</P
 132 ></DIV
 133 ><DIV
 134 CLASS="SECT2"
 135 ><H2
 136 CLASS="SECT2"
 137 ><A
 138 NAME="AEN2038"
 139 >Screen Update Interval</A
 140 ></H2
 141 ><P
 142 >  This value determines the rate in seconds at which the screen is
 143   updated. The default is 0, which means the screen is updated as fast
 144   as possible, giving close-to-realtime reflection
 145   of network activity. However, this high-speed update can cause
 146   incredible amounts of traffic if IPTraf is run on a remote
 147   terminal (e.g. a Telnet or Secure Shell session). You can set this
 148   to a higher value, such as 1 or 2 seconds to slow down the updates.</P
 149 ><P
 150 >  This figure does not affect the rate of data capture. Only the
 151   screen refresh is affected. The figures are still updated as fast as
 152   possible, although the figure display will no longer be as close
 153   to realtime.</P
 154 ><P
 155 >  The default setting is 0, which shouldn't be a problem on the
 156   console. Set it to a slightly higher value on remote terminals or slow
 157   links. The setting affects all monitoring facilities.</P
 158 ><DIV
 159 CLASS="NOTE"
 160 ><P
 161 ></P
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 168 WIDTH="25"
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 171 ><IMG
 172 SRC="./stylesheet-images/note.gif"
 173 HSPACE="5"
 174 ALT="Note"></TD
 175 ><TH
 176 ALIGN="LEFT"
 177 VALIGN="CENTER"
 178 ><B
 179 >Note</B
 180 ></TH
 181 ></TR
 182 ><TR
 183 ><TD
 184 >&nbsp;</TD
 185 ><TD
 186 ALIGN="LEFT"
 187 VALIGN="TOP"
 188 ><P
 189 >   Updating the screen is one of the slowest operations in a
 190   program. Older versions of IPTraf had a problem once network
 191   activity became very high. Because each packet caused a screen update,
 192   IPTraf began spending more time with the screen updates, causing a loss
 193   of packets once network activity reached a certain point.</P
 194 ><P
 195 >  However, since many users like rapid counts on their screen, a
 196   compromise was incorporated. Even when the screen update interval is set
 197   to 0, there is still a 50ms delay between screen updates (except the LAN
 198   station monitor, which has a 100 ms delay). This is still visually fast,
 199   but provides more time to the packet capture routine. Higher
 200   delays may result in better accuracy of counts and activity.</P
 201 ><P
 202 >  In any case, this setting only affects screen updates. Capture still
 203   proceeds as fast as possible.</P
 204 ></TD
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 206 ></TABLE
 207 ></DIV
 208 ></DIV
 209 ><DIV
 210 CLASS="SECT2"
 211 ><H2
 212 CLASS="SECT2"
 213 ><A
 214 NAME="AEN2048"
 215 >TCP closed/idle persistence</A
 216 ></H2
 217 ><P
 218 >  This parameter
 219   determines the interval (in minutes) at which the IP Traffic Monitor
 220   clears from the TCP display window all closed, idle, and timed out
 221   entries. Enter <TT
 222 CLASS="COMPUTEROUTPUT"
 223 >0</TT
 224 > to keep such entries on the
 225   screen indefinitely, disappearing only when replaced by new connections.</P
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 247 >Note</B
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 250 ><TR
 251 ><TD
 252 >&nbsp;</TD
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 254 ALIGN="LEFT"
 255 VALIGN="TOP"
 256 ><P
 257 >  The <I
 258 CLASS="EMPHASIS"
 259 >TCP timeout...</I
 260 > option
 261   only tells IPTraf how long it should take before a connection should
 262   be considered idle and open to replacement by new connections. This does
 263   not determine how long
 264   it remains onscreen. The <I
 265 CLASS="EMPHASIS"
 266 >TCP closed/idle
 267   persistence...</I
 268 >
 269    parameter flushes entries that have been closed or reset, or idle for the number
 270   of minutes defined by the <I
 271 CLASS="EMPHASIS"
 272 >TCP timeout...</I
 273 > option.</P
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