NAME

       trafshow - full screen show network traffic

SYNOPSIS

       trafshow [-vpnb] [-a len] [-c conf] [-i name] [-s str] [-u port] [-R refresh] [-P purge] [-F file | expr]

DESCRIPTION

TrafShow is a simple interactive program that gather the network traffic from all libpcap-capable
interfaces to accumulate it in memory cache, and then separately display it on appropriated curses window
in line-narrowed manner as a list of network flows sorted by throughput. Display updates occurs nearly in
real time, asynchronously from the data collecting. It look like a live show of traffic flows. Any kind
of network traffic are mixed together in the one live-show screen, an Ethernet, IP, etc.
Hint: Please press `H' key inside a show to get brief help!

The IP traffic can be aggregated by netmask prefix bits and service ports to reorganize a heap of trivial
flows into the treelike hierarchies suitable for human perception. The user can glance over the list of
resulting flows and select at their to browse detail. So you can deepen into the traffic inheritance
hierarchy and inspect the packets of each trivial flow in variety of presentations: raw-hex, ascii, time-
stamp.
The program make aggregation automatically when number of flows will exceed some reasonable amount. Just
a few seconds after launch may be required for adaptation to your volume of traffic. Use -a len option
(see below) to overwrite the default behaviour.

TrafShow also listens on UDP port (9995 by default) for diverse feeders of Cisco Netflow and then
separately display the collected data in the same manner as described above. The following versions of
Netflow are currently supported: V1, V5, V7. Use -u port option (see below) to overwrite the default
behaviour.

This program may be found wonderful at lest to locate suspicious traffic on the net very quickly on
demand, or to evaluate real time traffic bandwidth utilization, in a simplest and convenient environment.
But it is not intended for collecting and analysis of the network traffic for a long period of time, nor
for billing!

The program pretend to be IPv6 compatible and ready to using, but it is not tested enough. You can define
INET6 to do so.

OPTIONS

-v Print detailed version information and exit.

-p Do not put interface(s) into promiscuous mode.

-n Do not convert numeric values to names (host addresses, port numbers, etc.). The mode can be
toggled On/Off during a show by pressing the `N' key.

-b To place a backflow entries near to the main streams in the sorted list of traffic flows.
Note: this mode can raise the system load dangerously high because it take a lot of CPU cycles!

-a len To aggregate traffic flows using IP netmask prefix len. This option also turn on service ports
aggregation. The len expected as number of bits in the network portion of IP addresses (like
CIDR). The aggragation len can be changed during a show by pressing the `A' key, and turned Off
by empty string.
Hint: Please use 0 to reduce output just for network services.

-c conf
Use alternate color config file instead of default /etc/trafshow.

-i name
Listen on the specified network interface name. If unspecified, TrafShow collect data from all
network interfaces, configured UP in the system. In the last case the system must supply enough
number of packet capture devices (like /dev/bpf#).

-s str To search and follow for list item matched by string, moving the cursor bar. The found item try to
stay highlighted. The mode can be turned Off by `Ctrl-/' key press or [re]entered again by `/' key
directly in the live show.

-u port
Listen on the specified UDP port number for the Cisco Netflow feed. The default port number is
9995.
Hint: Please use 0 to disable this functionality.

-R refresh
Set the refresh period of data show to seconds, 2 seconds by default. This option can be changed
during a show by pressing the `R' key.

-P purge
Set the expired data purge period to seconds, 10 seconds by default. This option can be changed
during a show by pressing the `P' key.

-F file
Use file as input for the filter expression.

expr Select which packets will be displayed. If no expression is given, all packets on the net will be
displayed. Otherwise, only packets for which expression is `true' will be displayed.
The filter expression can be changed during a show by pressing the `F' key, and turned Off by
empty string.
Please see tcpdump(1) man page for syntax of filter expression.

FILES

       /etc/trafshow
              The default colors configuration file if any.

       $HOME/.trafshow
              The personal file with the user defined colors.

COLORS

       If  TrafShow has been compiled with modern curses libraries such as Slang or Ncurses it been able to show
       colored traffic on the color-capable terminal. Hopefully, no special actions  required  to  install  them
       because your system has it by default (leastwise last years).

       The syntax of TrafShow color configuration file as follow:

       default fcolor:bcolor
              Set the default screen background color-pair

       port[/proto] fcolor:bcolor
              Set color pattern by service port

       [proto] src[/mask][,port] dst[/mask][,port] fcolor:bcolor
              Set color pattern by pair of source and destination addresses

       The  tokens  *,  any,  or  all matchs ANY in the pattern.  Where fcolor is foreground color and bcolor is
       background color.
       The fcolor and bcolor may be one of the following:

       black red green yellow blue magenta cyan white
              It posible to indicate color as number from 0 to 7.

       The upper-case Fcolor mean bright on.  The upper-case Bcolor mean blink on.

ACKNOWLEDGEMENTS

       Thanks to Van Jacobson <van(at)helios.ee.lbl.gov> and Steven McCanne <mccanne(at)helios.ee.lbl.gov>,  all
       of  Lawrence Berkeley Laboratory, University of California, Berkeley.  Special thank to Jun-ichiro itojun
       Hagino <itojun(at)iijlab.net> for IPv6 patches.

AUTHOR

       Vladimir Vorobyev <bob(at)turbo.nsk.su>.

BUGS

       Depending of traffic volume, TrafShow can take a lot of CPU cycles and memory.
       It is impossible to use packet matching expressions in the NetFlow mode.

                                                    May 2004                                         TRAFSHOW(1)