-.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.156 2004-01-15 19:53:49 guy Exp $ (LBL)
+.\" @(#) $Header: /tcpdump/master/tcpdump/Attic/tcpdump.1,v 1.157 2004-01-15 19:55:56 guy Exp $ (LBL)
.\"
.\" $NetBSD: tcpdump.8,v 1.9 2003/03/31 00:18:17 perry Exp $
.\"
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.