netwatch(1M)     SYSTEM ADMINISTRATION COMMANDS      netwatch(1M)



NAME
     netwatch - Watch network traffic

SYNOPSIS
     /usr/sony/bin/netwatch [-sName] [-dName] [-aitu]  [  device-
     number ]

DESCRIPTION
     netwatch can display all packets being sent or received on a
     network  interface.   When  possible,  protocol  headers are
     decoded and printed in an easy to read format.  The  program
     has  no  effect  on normal system operation, and is provided
     for debugging and network trouble shooting.

     The device-number optional allows the user  to  specify  the
     network  interface by unit number.  The default is the built
     in ethernet interface.  Valid values start at 0.

     This program is derived from  the  Berkeley  tcpdump  source
     code.   All of the protocol decoding was ported, and some of
     the ethertalk portions have been enhanced.  The  program  is
     built  on  top of the Stanford packet filter that comes with
     the NEWS ethernet driver.

     It has options that allow specific protocols to be  filtered
     out.   The  source  and  destination addresses can also have
     individual filters assigned.  These options are:

     -dName
           This option tells the system to  only  accept  packets
           with  the  destination address of host Name.  The host
           name given must be listed in /etc/ethers.

     -sName
           This option tells the system to  only  accept  packets
           with  the  source address of host Name.  The host name
           given must be listed in /etc/ethers.

     -a    This option tells the system to discard all ARP packet
           types.

     -i    This option tells  the  system  to  discard  all  INET
           packet types.

     -t    This option tells the system  to  discard  all  TCP/IP
           packets.

     -u    This option tells the system  to  discard  all  UDP/IP
           packets.

FILES
     /etc/ethers /usr/include/io/sonyen.h



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netwatch(1M)     SYSTEM ADMINISTRATION COMMANDS      netwatch(1M)



SEE ALSO
     arp(7), inet(7), ip(7), tcp(7), udp(7), en(7).





















































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