Asus RT-N16 port forwarding problem

What steps will reproduce the problem?

I'm trying to forward a group of ports in range 7100-7110. 
I create new forwarding rule and enter port range as 7100:7110 in virtual 
server list.

What is the expected output? What do you see instead?

Start listening application on any port in this range and check the port using 
Open Port Checker: http://canyouseeme.org/
Port is closed.
If I remove this group rule and create 10 separate rules for each port - port 
is open.

What version of the product are you using?

Asus RT-N16 Firmware Version:: 7.0.2.34

Please provide any additional information below.

I have static external IP and external users can connect to me using opened 
ports. But the group forwarding seems to be broken.

Original issue reported on code.google.com by gars...@gmail.com on 17 Sep 2011 at 4:46

Ernillew / wl500g

Asus RT-N16 port forwarding problem #258