🚀 go-pugleaf

In article <bhqpxa.ane@wang.com> fitz@wang.com (Tom Fitzgerald) writes:
>SCO works ok as a router, though it isn't a very fast one.  In fact, I
>don't know of any way to turn off routing in the kernel (though you can
>disable the routing daemon).  Even if the machine only has a single
>interface, if it gets a mis-addressed packet, SCO will attempt to route it.

In the next SCO TCP/IP release this will be controlled by kernel tunable
parameters.  In the meantime the following program can be used to turn routing
off.

At TCP startup time, as root, run
	kpatch ipforwarding 0
	kpatch ipsendredirects 0

This will disable forwarding of datagrams on systems that you don't want
to act as routers.

-- Steve

#--------------------------------CUT HERE-------------------------------------
#! /bin/sh
#
# This is a shell archive.  Save this into a file, edit it
# and delete all lines above this comment.  Then give this
# file to sh by executing the command "sh file".  The files
# will be extracted into the current directory owned by
# you with default permissions.
#
# The files contained herein are:
#
# -rw-r--r--  1 stevea       1297 Jan  9 09:46 kpatch.c
#
echo 'x - kpatch.c'
if test -f kpatch.c; then echo 'shar: not overwriting kpatch.c'; else
sed 's/^X//' << '________This_Is_The_END________' > kpatch.c
X/*
X * Kpatch -- poke values in the kernel address space
X * Only works for 32-bit values
X */
X#include <sys/types.h>
X#include <sys/fcntl.h>
X#include <sys/unistd.h>
X#include <stdio.h>
X#include <nlist.h>
X#include <errno.h>
X
Xmain(argc, argv)
X	int             argc;
X	char          **argv;
X{
X	struct nlist    nl[2];
X
X	int             r;
X	unsigned        val;
X	unsigned        oval;
X	int             k;
X
X	if (argc < 3) {
X		fprintf(stderr, "usage: kpatch addr val\n");
X		exit(1);
X	}
X	k = open("/dev/kmem", O_RDWR);
X	if (k < 0)
X		error("kmem");
X
X	val = atoi(argv[2]);
X
X	nl[0].n_name = argv[1];
X
X	nl[1].n_name = "";
X
X	nlist("/unix", nl);
X
X	r = lseek(k, nl[0].n_value, 0);
X	if (r == -1)
X		error("read seek");
X	r = read(k, &oval, sizeof(oval));
X	if (r < sizeof(oval))
X		error("read");
X
X	r = lseek(k, nl[0].n_value, 0);
X	if (r == -1)
X		error("write seek");
X	printf("addr of %s = %lx, old value = %d\n", nl[0].n_name, 
X		nl[0].n_value, oval);
X
X	r = write(k, &val, sizeof(val));
X
X	if (r < 0)
X		error("write");
X
X	r = lseek(k, nl[0].n_value, 0);
X	if (r == -1)
X		error("read seek 2");
X	r = read(k, &oval, sizeof(oval));
X	if (r < sizeof(oval))
X		error("read 2");
X
X	printf("addr of %s = %lx, new value = %d\n", nl[0].n_name, 
X		nl[0].n_value, oval);
X	exit(0);
X}
X
Xerror(s)
X	char           *s;
X{
X	perror(s);
X	exit(1);
X}
________This_Is_The_END________
if test `wc -l < kpatch.c` -ne 74; then
	echo 'shar: kpatch.c was damaged during transit (should have been 74 lines)'
fi
fi		; : end of overwriting check
exit 0
-- 
Steve Alexander, Software Technologies Group    | stevea@i88.isc.com
INTERACTIVE Systems Corporation, Naperville, IL | ...!{sun,ico}!laidbak!stevea