diff -ur --unidirectional-new-file skipsrc-1.0.orig/skip/tools/skiphost/skiphost.c skipsrc-1.0/skip/tools/skiphost/skiphost.c
--- skipsrc-1.0.orig/skip/tools/skiphost/skiphost.c	Fri Oct 25 13:13:03 1996
+++ skipsrc-1.0/skip/tools/skiphost/skiphost.c	Sun Apr 12 15:29:52 1998
@@ -76,6 +76,7 @@
 static char	*skip_version = NULL;
 static char	*skip_mode = NULL;
 static char	*tunnel = NULL;
+static char	*srcaddr = NULL;
 
 static int	opt, opt_cpt;
 static int	opt_action, opt_more;
@@ -89,11 +90,14 @@
 static int	opt_prt, opt_sh, opt_sel;
 static int	opt_trs, opt_tunnel;
 static int	opt_msk, opt_nomadic;
+static int	opt_source;
 
 boolean_t       on_boot = B_FALSE;
 
 #define		SKIP_HOST_MASK	"255.255.255.255"
 
+struct in_addr 	source_addr;
+
 static void	usage();
 
 /*
@@ -218,6 +222,11 @@
 	if (params->ip_addr.s_addr != params->tunnel_addr.s_addr) {
 		printf(" -A %s", inet_ntoa(params->tunnel_addr));
 	}
+	
+	if(params->source != 0) {
+		source_addr.s_addr = params->source;	
+		printf(" -f %s", inet_ntoa(source_addr));
+	}
 
 	switch (params->version) {
 
@@ -376,6 +385,11 @@
 		printf(" tunnel=%s", inet_ntoa(params->tunnel_addr));
 	}
 
+	if (params->source != 0) {
+		source_addr.s_addr = params->source;
+		printf(" source=%s", inet_ntoa(source_addr));
+	}
+
 	switch (params->version) {
 
 	case SKIP_NONE:
@@ -907,12 +921,18 @@
 		}
 	}
 
+	if(opt_source) {
+		parms.source = inet_addr(srcaddr);
+	} else {
+		parms.source = 0;
+	}
+
 	/*
 	 * Check if a cleartext host...
 	 */
 	opt_sel = opt_r_nsid + opt_s_nsid + opt_r_keyid;
 	opt_sel += opt_kij + opt_crypt + opt_mac + opt_comp;
-	opt_sel += opt_vers + opt_nomadic + opt_tunnel;
+	opt_sel += opt_vers + opt_nomadic + opt_tunnel + opt_source;
 
 	if (!opt_sel) {
 		/*
@@ -1531,6 +1551,7 @@
 		"\t\t[-r <receiver NSID>] [-R <receiver key Id>]...\n"
 		"\t\t[-s <sender NSID>] [-S <sender key Id>]...\n"
 		"\t\t[-v <SKIP version>] [-A <tunnel address>] [-T]\n"
+		"\t\t[-f <source address>]\n"
 		"\t%s [-i <interface>] "
 			"-x <hostname|IP address|\"*\"> [-M <mask>]...\n"
 		"\t\t[-k <kij algorithm>] [-t <crypt algorithm>]...\n"
@@ -1592,6 +1613,7 @@
 	opt_trs = opt_msk = 0;
 	opt_prt = opt_sh = opt_mode = 0;
 	opt_nomadic = opt_tunnel = 0;
+	opt_source = 0;
 
 	ifname = skip_default_if();
 
@@ -1614,7 +1636,7 @@
 	 */
 	optind = 1;
 	while ((opt = getopt(argc, argv,
-			"phuPVTa:d:o:x:i:s:r:S:R:k:t:m:c:v:M:A:")) != -1) {
+			"phuPVTa:d:o:x:i:s:r:S:R:k:t:m:c:v:M:A:f:")) != -1) {
 
 		switch (opt) {
 	
@@ -1761,7 +1783,10 @@
 			SKIP_ONE(&opt_tunnel);
 			tunnel = optarg;
 			break;
-
+		case 'f':
+			SKIP_ONE(&opt_source);
+			srcaddr = optarg;
+			break;
 		case 'h':
 		default:
 			usage();
@@ -1890,7 +1915,7 @@
 		opt_sel = opt_r_nsid + opt_s_nsid + opt_r_keyid + opt_s_keyid;
 		opt_sel += opt_kij + opt_crypt + opt_mac + opt_comp;
 		opt_sel += opt_mode + opt_vers + opt_trs + opt_msk;
-		opt_sel += opt_tunnel;
+		opt_sel += opt_tunnel + opt_source;
 
 		if (opt_sel) {
 			fprintf(stderr, "%s -u does not take options\n",
@@ -1912,7 +1937,7 @@
 		opt_sel = opt_r_nsid + opt_s_nsid + opt_r_keyid + opt_s_keyid;
 		opt_sel += opt_kij + opt_crypt + opt_mac + opt_comp;
 		opt_sel += opt_mode + opt_vers + opt_trs + opt_msk;
-		opt_sel += opt_tunnel;
+		opt_sel += opt_tunnel + opt_source;
 
 		if (opt_sel) {
 			fprintf(stderr, "%s -p does not take options\n",
@@ -1941,7 +1966,7 @@
 		opt_sel = opt_r_nsid + opt_s_nsid + opt_r_keyid + opt_s_keyid;
 		opt_sel += opt_kij + opt_crypt + opt_mac + opt_comp;
 		opt_sel += opt_mode + opt_vers + opt_trs + opt_msk;
-		opt_sel += opt_tunnel;
+		opt_sel += opt_tunnel + opt_source;
 
 		if (opt_sel) {
 			fprintf(stderr, "%s -P does not take options\n",
@@ -1963,7 +1988,7 @@
 		opt_sel = opt_r_nsid + opt_s_nsid + opt_r_keyid + opt_s_keyid;
 		opt_sel += opt_kij + opt_crypt + opt_mac + opt_comp;
 		opt_sel += opt_mode + opt_vers + opt_trs + opt_msk;
-		opt_sel += opt_tunnel;
+		opt_sel += opt_tunnel + opt_source;
 
 		if (opt_sel) {
 			fprintf(stderr, "%s -V does not take options\n",
@@ -1985,7 +2010,7 @@
 		opt_sel = opt_r_nsid + opt_s_nsid + opt_r_keyid + opt_s_keyid;
 		opt_sel += opt_kij + opt_crypt + opt_mac + opt_comp;
 		opt_sel += opt_vers + opt_trs + opt_msk;
-		opt_sel += opt_tunnel;
+		opt_sel += opt_tunnel + opt_source;
 
 		if (opt_sel) {
 			usage();
@@ -2018,7 +2043,7 @@
 		 */
 		opt_sel = opt_s_nsid + opt_s_keyid;
 		opt_sel += opt_kij + opt_crypt + opt_mac + opt_comp;
-		opt_sel += opt_mode + opt_trs + opt_tunnel;
+		opt_sel += opt_mode + opt_trs + opt_tunnel + opt_source;
 
 		if (opt_sel) {
 			usage();