--- fping-2.4b2/fping.c.orig-specify_interface	2007-01-23 21:38:16.000000000 -0200
+++ fping-2.4b2/fping.c	2007-01-23 21:37:47.000000000 -0200
@@ -103,6 +103,7 @@
 /* Linux has bizarre ip.h and ip_icmp.h */
 #if defined( __linux__ )
 #include "linux.h"
+#include <net/if.h>
 #else
 #include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
@@ -490,7 +491,7 @@
 
 	/* get command line options */
 
-	while( ( c = getopt( argc, argv, "gedhlmnqusaAvz:t:i:p:f:r:c:b:C:Q:B:" ) ) != EOF )
+	while( ( c = getopt( argc, argv, "gedhlmnqusaAvz:t:i:p:f:r:c:b:C:Q:B:I:" ) ) != EOF )
 	{
 		switch( c )
 		{
@@ -638,6 +639,16 @@
 			generate_flag = 1;
 			break;
 
+                  case 'I':
+                        {
+                             struct ifreq ifr;
+                    	     strncpy(ifr.ifr_name, optarg, IFNAMSIZ-1);
+
+                             if (setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)))
+                                    errno_crash_and_burn( "setsockopt(SO_BINDTODEVICE)" );
+                             break;
+                        }
+   
 		default:
 			usage();
 			break;
@@ -2752,6 +2763,7 @@
 	fprintf( stderr, "   -r n       number of retries (default %d)\n", retry );
 	fprintf( stderr, "   -s         print final stats\n" );
 	fprintf( stderr, "   -t n       individual target initial timeout (in millisec) (default %d)\n", timeout / 100 );
+	fprintf(stderr,"   -I intface selects network interface (e.g, \"eth0\")\n");
 	fprintf( stderr, "   -u         show targets that are unreachable\n" );
 	fprintf( stderr, "   -v         show version\n" );
 	fprintf( stderr, "   targets    list of targets to check (if no -f specified)\n" );
--- fping-2.4b2/fping.8.orig-specify_interface	2007-01-23 21:44:47.000000000 -0200
+++ fping-2.4b2/fping.8	2007-01-23 21:57:25.000000000 -0200
@@ -138,6 +138,8 @@
 multiplied by the backoff factor.
 .IP \fB-u\fR 5
 Show targets that are unreachable.
+.IP \fB-I\fIinterface\fR 5
+Specify interface to use (for example, eth0)
 .IP \fB-v\fR 5
 Print 
 .B fping