Index: src/igmp.c
--- src/igmp.c.orig
+++ src/igmp.c
@@ -132,6 +132,7 @@ void acceptIgmp(int recvlen) {
         }
         else {
             struct IfDesc *checkVIF;
+            int downIf = -1;
 
             for(i=0; i<MAX_UPS_VIFS; i++)
             {
@@ -149,20 +150,29 @@ void acceptIgmp(int recvlen) {
                         return;
                     }
                     else if(!isAdressValidForIf(checkVIF, src)) {
-                        struct IfDesc *downVIF = getIfByAddress(src);
-                        if (downVIF && downVIF->state & IF_STATE_DOWNSTREAM) {
-                            my_log(LOG_NOTICE, 0, "The source address %s for group %s is from downstream VIF[%d]. Ignoring.",
-                                inetFmt(src, s1), inetFmt(dst, s2), i);
+                        unsigned Ix;
+                        struct IfDesc *Dp;
+
+                        for ( Ix = 0; (Dp = getIfByIx( Ix )); Ix++ ) {
+                            if ((Dp->state == IF_STATE_DOWNSTREAM) && isAdressValidForIf(Dp, src)) {
+                                downIf = Ix;
+                                break;
+                            }
+                        }
+
+                        if (downIf == -1) {
+                            my_log(LOG_WARNING, 0, "The source address %s for group %s, is not in any valid net for upstream VIF.",
+                               inetFmt(src, s1), inetFmt(dst, s2));
+                            return;
                         } else {
-                            my_log(LOG_WARNING, 0, "The source address %s for group %s, is not in any valid net for upstream VIF[%d].",
-                                inetFmt(src, s1), inetFmt(dst, s2), i);
+                            my_log(LOG_NOTICE, 0, "The source address %s for group %s, is valid DOWNSTREAM VIF #%d.",
+                            inetFmt(src, s1), inetFmt(dst, s2), downIf);
                         }
                     } else {
                         // Activate the route.
-                        int vifindex = checkVIF->index;
-                        my_log(LOG_DEBUG, 0, "Route activate request from %s to %s on VIF[%d]",
-                            inetFmt(src,s1), inetFmt(dst,s2), vifindex);
-                        activateRoute(dst, src, vifindex);
+                        my_log(LOG_DEBUG, 0, "Route activate request from %s to %s, downIf %d",
+                            inetFmt(src,s1), inetFmt(dst,s2), downIf);
+                        activateRoute(dst, src, downIf);
                         i = MAX_UPS_VIFS;
                     }
                 } else {
@@ -192,9 +202,9 @@ void acceptIgmp(int recvlen) {
         return;
     }
 
-    my_log(LOG_NOTICE, 0, "RECV %s from %-15s to %s",
+    my_log(LOG_NOTICE, 0, "RECV %s from %-15s to %s (ip_hl %d, data %d)",
         igmpPacketKind(igmp->igmp_type, igmp->igmp_code),
-        inetFmt(src, s1), inetFmt(dst, s2) );
+        inetFmt(src, s1), inetFmt(dst, s2), iphdrlen, ipdatalen);
 
     switch (igmp->igmp_type) {
     case IGMP_V1_MEMBERSHIP_REPORT: