Index: ares-1.1.1/ares_private.h
===================================================================
--- ares-1.1.1.orig/ares_private.h	2015-11-25 14:53:29.272441538 +0800
+++ ares-1.1.1/ares_private.h	2015-11-25 14:53:29.432521543 +0800
@@ -115,6 +115,9 @@
 
   /* Active queries */
   struct query *queries;
+
+  /*ZyXEL To support Multi-interface*/
+  unsigned int ifMark; //interface Mark
 };
 
 void ares__send_query(ares_channel channel, struct query *query, time_t now);
Index: ares-1.1.1/ares_process.c
===================================================================
--- ares-1.1.1.orig/ares_process.c	2015-11-25 14:53:29.272441538 +0800
+++ ares-1.1.1/ares_process.c	2015-11-25 14:53:29.432521543 +0800
@@ -453,6 +453,12 @@
       close(s);
       return -1;
     }
+  /*ZyXEL Multi-interface*/
+  //printf("Ares IfMark:%x\n", channel->ifMark);
+  if(setsockopt(s, SOL_SOCKET, SO_MARK, &channel->ifMark, sizeof(channel->ifMark)) == -1)
+    {
+      printf("<<Error>> Ares setsockopt failed!\n");
+    }
 
   /* Connect to the server. */
   memset(&sin, 0, sizeof(sin));
@@ -480,6 +486,13 @@
   if (s == -1)
     return -1;
 
+  /*ZyXEL Multi-interface*/
+  //printf("Ares IfMark:%x\n", channel->ifMark);
+  if(setsockopt(s, SOL_SOCKET, SO_MARK, &channel->ifMark, sizeof(channel->ifMark)) == -1)
+    {
+      printf("<<Error>> Ares setsockopt failed!\n");
+    }
+
   /* Connect to the server. */
   memset(&sin, 0, sizeof(sin));
   sin.sin_family = AF_INET;