@(#) $Header$ (LBL)

Traceroute is known to build and run under SunOS 4.1.4 and Solaris 5.4.
If you are running a really old kernel, see the instructions under the
title "KERNEL MODIFICATIONS" further down.

To build traceroute, first customize any paths in Makefile.in, then run
"./configure" (a shell script). The configure script will determine
your system attributes and generate an appropriate Makefile from
Makefile.in. Next run "make". If everything goes well you can su to
root and run "make install" and "make install-man". Note that traceroute
must be installed setuid to root or run as root.

If configure fails for some reason and decide to submit a bug report to
traceroute@ee.lbl.gov, please include a copy of config.log.

You will need an ANSI C compiler to build libpcap. The configure script
will abort if your compiler is not ANSI compliant. If this happens, use
the GNU C compiler, available via anonymous ftp:

        ftp://prep.ai.mit.edu/pub/gnu/gcc-*.tar.gz

If you get the error message:

	traceroute: unknown protocol icmp

it usually means you're missing the icmp line in /etc/protocols.

If you are using Solaris 2.5.1 (and possibly higher), traceroute cannot
calculate checksums; configure automatically changes the default to
reflect this. The kernel updates the ip_id field with some unknown
value and the ip_off field with the IP_DF bit. Also, if the the udp
uh_sum field is non-zero, it gets updated with the value of the uh_ulen
field... This means that the icmp echo option (-I flag) is not as
useful.

KERNEL MODIFICATIONS
--------------------
If yor have a really old system, it may be necessary to modify your
kernel before traceroute will work. If you want to hack on your kernel,
a modified version of the routine rip_output (normally found in the
file /sys/netinet/raw_ip.c) can be found in rip_output.c. This code may
or may not resemble the code in your kernel. It may offer you a place
to start but we make no promises. If you do hack your kernel, remember
to test everything that uses raw ip sockets (e.g., ping and
egpup/gated) & make sure they still work. We wish you the best of luck
and you're on your own.

Some older kernels forward icmp packets that have a ttl of zero. If
your system has this bug, you might want to fix it while you're in the
kernel.  (This bug appears in all releases of BSD up to but not
including 4.3tahoe. If your version of netinet/ip_icmp.c is any earlier
than 7.3 (April, '87), it has the bug.)  The fix is just to add the
line:

	ip->ip_ttl = MAXTTL;

after the line:

	ip->ip_src = t;

(or anywhere before the call to icmp_send) in routine icmp_reflect.

If you're running this on a pre-4.3bsd system (e.g., SunOS 3) that
strips ip headers from icmp messages, add -DARCHAIC to CFLAGS in the
Makefile.  Also note that rip_output contains a conditional for a
4.2/4.3 change in the location of a raw socket's protocol number.  I've
checked this under 4.3 & SunOS 3 but you should double-check your
system to make sure the appropriate branch of the #if is taken (check
the line that assigned to ip->ip_p in your system's original
rip_output).


FILES
-----
CHANGES         - description of differences between releases
FILES		- list of files exported as part of the distribution
INSTALL         - this file
Makefile.in	- compilation rules (input to the configure script)
README		- description of distribution
VERSION		- version of this release
aclocal.m4	- autoconf macros
config.guess	- autoconf support
config.sub	- autoconf support
configure	- configure script (run this first)
configure.in	- configure script source
ifaddrlist.c	- inet address routines
install-sh	- BSD style install script
lbl/gnuc.h	- gcc macros and defines
lbl/os-*.h	- os dependent defines and prototypes
linux-include/*	- network include files missing on Linux
mean.awk	- awk script to print out the mean time along a route
median.awk	- awk script to print out the median time along a route
mkdep		- construct Makefile dependency list
rip_output.c	- sample rip_output() from  /sys/netinet/raw_ip.c
strerror.c	- emulation routine
traceroute.8	- manual entry
traceroute.c	- main program
traceroute.h	- global prototypes