--- smjoin6.c.old	2013-06-12 23:37:11.000000000 +0530
+++ smjoin6.c	2013-06-13 21:53:38.000000000 +0530
@@ -1,6 +1,6 @@
 /*********************************************************************/
 char    *pname="smjoin";
-char    *usage="ff3e::1234:4321 [-s 2001:250:ccce::] [-p 1700] [-raw] [-c 10] [-k 1000] [-pid file]";
+char    *usage="ff3e::1234:4321 [-i 2] [-s 2001:250:ccce::] [-p 1700] [-raw] [-c 10] [-k 1000] [-pid file]";
 
 /*
  * Copyright (C) 2008 CERNET Network Center 
@@ -111,6 +111,7 @@
 
     for (ki = 1; ki < argc; ki++) {
        if ('-' != argv[ki][0])         		kfin[++kfi] = ki;
+       else if (strcmp("-i", argv[ki]) == 0)   	{intface=atoi(argv[++ki]);}
        else if (strcmp("-s", argv[ki]) == 0)   	{sss=1; strcpy(asource, argv[++ki]);}
        else if (strcmp("-p", argv[ki]) == 0)   	iport = atoi(argv[++ki]);