Document "ppp", "slip", and "link" as references to the link layer

protocol in "expr relop expr" expressions.

diff --git a/tcpdump.1 b/tcpdump.1
index 3a759ee1ca64617b5e8bcfa652ad7a9a3b0fef7b..ebad39bdda93e001c5ecf4fb8b1c0fcff66798c4 100644 (file)
--- a/tcpdump.1
+++ b/tcpdump.1
@@ -1,4 +1,4 @@
-.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.114 2002-01-04 07:37:49 guy Exp $ (LBL)
+.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.115 2002-01-25 05:27:27 guy Exp $ (LBL)
 .\"
 .\" Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992, 1994, 1995, 1996, 1997
 .\"    The Regents of the University of California.  All rights reserved.
@@ -772,9 +772,11 @@ data inside the packet, use the following syntax:
 \fIproto\fB [ \fIexpr\fB : \fIsize\fB ]\fR
 .fi
 .in -.5i
-\fIProto\fR is one of \fBether, fddi, tr,
+\fIProto\fR is one of \fBether, fddi, tr, ppp, slip, link,
 ip, arp, rarp, tcp, udp, icmp\fR or \fBip6\fR, and
 indicates the protocol layer for the index operation.
+(\fBether, fddi, tr, ppp, slip\fR and \fBlink\fR all refer to the link
+layer.)
 Note that \fItcp, udp\fR and other upper-layer protocol types only
 apply to IPv4, not IPv6 (this will be fixed in the future).
 The byte offset, relative to the indicated protocol layer, is