.TH SNOOPY 8
.SH NAME
snoopy \- spy on Ethernet packets
.SH SYNOPSIS
.B snoopy
[
.B \-abeiltup9
][
.B \-np
]
.SH DESCRIPTION
.I 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.
.TP
.B a
ARP
.TP
.B b
BOOTP
.TP
.B e
all Ethernet packets
.TP
.B i
IP
.TP
.B l
IL
.TP
.B t
TCP
.TP
.B u
UDP
.PP
By default all addresses are translated into system names.
The option
.B n
suppresses this.
.PP
.I Snoopy
runs in promiscuous mode by default, displaying all packets
it can capture from the Ethernet.
The option
.B p
causes only packets sent to or from the system
.I snoopy
is running on to be displayed.
.PP
Option
.B 9
causes the data of TCP and IL messages to be interpreted and displayed as
9P messages.
.SH FILES
.TP
.B /net/ether
Ethernet device
.SH BUGS
.PP
The CPU servers do not take well to running in promiscuous mode.
If run on them, 
.I snoopy
may kill their Ethernets.
