I sponsor a free wireless hotspot to a local beach. I'd like to put in rules so that no one in the LAN can access the the admin login. This network is IP is: 10.0.0.*. I can log in from the WAN from the router above fine. Running firmware: 2.38, it seems when I add firewall rules, the router sloooowwwwsss down, on the order of a normal ping of the upside router of 3-4ms to a ping of over 1 second. What is the format of the rule, and what firmware supports firewall rules?