iRule defined pool of IP addresses

Hi, I want to see at any one time what IP addresses are been used

 

 

Also I have a tcp idle timeout defined system of 600 second but I notice with the iRule I have following and have clients reporting timeout issues are 3mins. Does this table override system setting? Do both need to be change or more specific the "used_ips"

 

 

table add -subtable "used_ips" $ip [TCP::client_port] 300

 

table add -subtable "client_ids" [TCP::client_port] $ip 300