Avoid divide-by-zero when dhcp-range is a whole /64
diff --git a/CHANGELOG b/CHANGELOG
index 5feb47c..14354f2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -40,12 +40,15 @@
 
 	    Extend --add-mac to allow a new encoding of the MAC address 
 	    as base64, by configurting --add-mac=base64
-
+ 
 	    Add --add-cpe-id option.
 
-	
-	    
-	
+            Don't crash with divide-by-zero if an IPv6 dhcp-range
+	    is declared as a whole /64.
+	    (ie xx::0 to xx::ffff:ffff:ffff:ffff) 
+	    Thanks to Laurent Bendel for spotting this problem.
+
+
 version 2.75
             Fix reversion on 2.74 which caused 100% CPU use when a 
 	    dhcp-script is configured. Thanks to Adrian Davey for