diff --git a/radix/radix.c b/radix/radix.c
index 3cbbb94..2f30653 100644
--- a/radix/radix.c
+++ b/radix/radix.c
@@ -85,7 +85,7 @@ int radix_insert(radix_holder_t t, ipv6_t key, int val, int mask) {
     }
     
     /* exact match */
-    if (node->_rule_valid) {
+    if (node->_rule_valid && node->_ip_end_bit == mask) {
         printf("WARNING: conflicting rule %x:%x:%x:%x:%x:%x:%x:%x", 
             key.s[0], key.s[1], key.s[2], key.s[3],
             key.s[4], key.s[5], key.s[6], key.s[7]);
@@ -94,6 +94,15 @@ int radix_insert(radix_holder_t t, ipv6_t key, int val, int mask) {
         return 0;
     }
 
+    /* match with lower mask */
+    if (node->_rule_valid) {
+        split_node(node, ibit);
+
+        b = GET_BIT(node->_ip, ibit + 1);
+        next = b ? &node->_r : &node->_l;
+        *next = NULL;
+    }
+
     node->_rule_valid = VALID_RULE;
     node->_rule = val;
     return 1;