X.25 to TCP/IP conversion Post: 26376

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LEARN ABOUT PLAN9

snoopy

SNOOPY(8)						      System Manager's Manual							 SNOOPY(8)

NAME

       snoopy - spy on Ethernet packets

SYNOPSIS

       snoopy [ -abceiltup9 ] [ -np ] [ -N count ]

DESCRIPTION

       Snoopy  displays  the  header  and  first  20  data bytes of packets received from the local Ethernet.  The packets displayed depend on the
       options chosen.	The following options each select packets from a particular protocol.  If more than one flag is given,	packets  from  all
       those protocols are displayed.

       a      ARP

       b      BOOTP

       c      ICMP

       e      all Ethernet packets

       i      IP

       l      IL

       t      TCP

       u      UDP

       By default all addresses are translated into system names.  The option n suppresses this.

       Snoopy runs in promiscuous mode by default, displaying all packets it can capture from the Ethernet.  The option p causes only packets sent
       to or from the system snoopy is running on to be displayed.

       Option 9 causes the data of TCP and IL messages to be interpreted and displayed as 9P messages.	The N option sets the count  (default  20)
       of the number of bytes to dump in hexadecimal from each packet.

FILES

       /net/ether
	      Ethernet device

SOURCE

       /sys/src/cmd/ip/snoopy.c

BUGS

       The CPU servers do not take well to running in promiscuous mode.  If run on them, snoopy may kill their Ethernets.

																	 SNOOPY(8)

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