The patch in the file named 'ttcp' is described in: ftp://ftp/freebsd.org/pub/CERT/advisories/FreeBSD-SA-98:03.ttcp It is meant for: FreeBSD-3.0-current before 1998/05/05 FreeBSD-2.2-stable before 1998/05/14 FreeBSD-2.1-stable before 1998/05/18 FreeBSD-2.1.* releases FreeBSD-2.2.0, 2.2.1, 2.2.2, 2.2.5 and 2.2.6 The patch in the file named 'ttcp.orig' contains an incorrect patch. DO NOT USE IT, unless you want to backout the incorrect patch that ws supplied with the original SA-98:03.ttcp advisory. (Use patch -R in that case).