-.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.152 2003-11-19 01:59:19 guy Exp $ (LBL)
+.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.163 2004-06-12 08:51:23 guy Exp $ (LBL)
.\"
.\" $NetBSD: tcpdump.8,v 1.9 2003/03/31 00:18:17 perry Exp $
.\"
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
-.TH TCPDUMP 1 "18 November 2003"
+.TH TCPDUMP 1 "22 March 2004"
.SH NAME
tcpdump \- dump traffic on a network
.SH SYNOPSIS
.I module
]
[
-.B \-r
-.I file
+.B \-M
+.I secret
]
.br
.ti +8
[
+.B \-r
+.I file
+]
+[
.B \-s
.I snaplen
]
.br
.ti +8
[
+.B \-W
+.I filecount
+]
+.br
+.ti +8
+[
.B \-E
.I spi@ipaddr algo:secret,...
]
.B \-y
.I datalinktype
]
+[
+.B \-Z
+.I user
+]
.ti +8
[
.I expression
is running, if the OS reports that information to applications; if not,
it will be reported as 0).
.LP
-On platforms that support the SIGINFO signal, such as most BSDs, it will
-report those counts when it receives a SIGINFO signal (generated, for
-example, by typing your ``status'' character, typically control-T) and
-will continue capturing packets.
+On platforms that support the SIGINFO signal, such as most BSDs
+(including Mac OS X) and Digital/Tru64 UNIX, it will report those counts
+when it receives a SIGINFO signal (generated, for example, by typing
+your ``status'' character, typically control-T, although on some
+platforms, such as Mac OS X, the ``status'' character is not set by
+default, so you must set it with
+.BR stty (1)
+in order to use it) and will continue capturing packets.
.LP
Reading packets from a network interface may require that you have
special privileges:
savefile and open a new one. Savefiles after the first savefile will
have the name specified with the
.B \-w
-flag, with a number after it, starting at 2 and continuing upward.
+flag, with a number after it, starting at 1 and continuing upward.
The units of \fIfile_size\fP are millions of bytes (1,000,000 bytes,
not 1,048,576 bytes).
.TP
This option
can be used several times to load several MIB modules into \fItcpdump\fP.
.TP
+.B \-M
+Use \fIsecret\fP as a shared secret for validating the digests found in
+TCP segments with the TCP-MD5 option (RFC 2385), if present.
+.TP
.B \-n
Don't convert addresses (i.e., host addresses, port numbers, etc.) to names.
.TP
function.
.TP
.B \-v
-(Slightly more) verbose output.
+When parsing and printing, produce (slightly more) verbose output.
For example, the time to live,
identification, total length and options in an IP packet are printed.
Also enables additional packet integrity checks such as verifying the
IP and ICMP header checksum.
+.IP
+When writing to a file with the
+.B \-w
+option, report, every 10 seconds, the number of packets captured.
.TP
.B \-vv
Even more verbose output.
They can later be printed with the \-r option.
Standard output is used if \fIfile\fR is ``-''.
.TP
+.B \-W
+Used in conjunction with the
+.I \-C
+option, this will limit the number
+of files created to the specified number, and begin overwriting files
+from the beginning, thus creating a 'rotating' buffer.
+In addition, it will name
+the files with enough leading 0s to support the maximum number of
+files, allowing them to sort correctly.
+.TP
.B \-x
Print each packet (minus its link level header) in hex.
The smaller of the entire packet or
.TP
.B \-y
Set the data link type to use while capturing packets to \fIdatalinktype\fP.
+.TP
+.B \-Z
+Drops privileges (if root) and changes user ID to
+.I user
+and the group ID to the primary group of
+.IR user .
+.IP
+This behavior can also be enabled by default at compile time.
.IP "\fI expression\fP"
.RS
selects which packets will be dumped.
for most of those protocols. The exceptions are:
.RS
.TP
-\fBiso\fP, \fBsap\fP, and \fBnetbeui\fP
+\fBiso\fP, \fBstp\fP, and \fBnetbeui\fP
\fItcpdump\fR checks for an 802.3 frame and then checks the LLC header as
it does for FDDI, Token Ring, and 802.11;
.TP
.B memory
(applies only to packets logged by OpenBSD's
.BR pf (4)).
+.IP "\fBrset \fIname\fR"
+True if the packet was logged as matching the specified PF ruleset
+name of an anchored ruleset (applies only to packets logged by
+.BR pf (4)).
+.IP "\fBruleset \fIname\fR"
+Synonomous with the
+.B rset
+modifier.
+.IP "\fBsrnr \fInum\fR"
+True if the packet was logged as matching the specified PF rule number
+of an anchored ruleset (applies only to packets logged by
+.BR pf (4)).
+.IP "\fBsubrulenum \fInum\fR"
+Synonomous with the
+.B srnr
+modifier.
.IP "\fBaction \fIact\fR"
True if PF took the specified action when the packet was logged. Known actions
are:
and
.B block
(applies only to packets logged by OpenBSD's
-.BR pf(4)).
+.BR pf (4)).
.IP "\fBip\fR, \fBip6\fR, \fBarp\fR, \fBrarp\fR, \fBatalk\fR, \fBaarp\fR, \fBdecnet\fR, \fBiso\fR, \fBstp\fR, \fBipx\fR, \fInetbeui\fP"
Abbreviations for:
.in +.5i
on a meta signaling circuit and is a Q.2931 Setup, Call Proceeding, Connect,
Release, or Release Done message.
.IP "\fIexpr relop expr\fR"
-True if the relation holds, where \fIrelop\fR is one of >, <, >=, <=, =, !=,
-and \fIexpr\fR is an arithmetic expression composed of integer constants
-(expressed in standard C syntax), the normal binary operators
-[+, -, *, /, &, |], a length operator, and special packet data accessors.
+True if the relation holds, where \fIrelop\fR is one of >, <, >=, <=, =,
+!=, and \fIexpr\fR is an arithmetic expression composed of integer
+constants (expressed in standard C syntax), the normal binary operators
+[+, -, *, /, &, |, <<, >>], a length operator, and special packet data
+accessors.
To access
data inside the packet, use the following syntax:
.in +.5i
ethernet interface removed the packet from the wire and when the kernel
serviced the `new packet' interrupt.
.SH "SEE ALSO"
-traffic(1C), nit(4P), bpf(4), pcap(3)
+stty(1), pcap(3), bpf(4), nit(4P), pfconfig(8)
.SH AUTHORS
The original authors are:
.LP
projects / tcpdump / blobdiff