iRule to Limit Connections from Source IP to Destination IP

when RULE_INIT { 
 Set a global max for number of concurrent TCP connections 
set ::max_connections 25 
 Print debug messages to /var/log/ltm? 1=yes, 0=no 
set ::debug 1 
 Initialize a counter for active connections (don't modify this) 
set ::active_connections 0 
Log local identifying start
log local0. "rule session_limit initialized: total/max: $::total_active_clients/$::max_active_clients" 
} 
when HTTP_REQUEST { 
 if the HTTP Request contains the specified URI String
if { [HTTP::uri] contains "URI" } {
 if we are over the limit for the connection, redirect 
if { not [HTTP::cookie exists "inpicheckout"] and $::active_connections > $::max_connections} {
 redirect
HTTP::redirect "http://www.sorry.com" 
 Close the connection 
TCP::close 
 Log a message to /var/log/ltm 
if {$::debug}{log local0. "Over limit (current/max: $::active_connections/$::max_connections). Closing to [IP::client_addr]"} 
 Increment the TCP connection count. 
incr ::active_connections 1 
} 
} 
when CLIENT_CLOSED {
 A connection was closed, so decrement the global counter 
incr ::active_connections -1
 if the Active Connections are less than 0 then reset to 0
if { $::active_connections <= 0 } { set ::active_connections 0 } 
 Log a message to /var/log/ltm 
if {$::debug}{log local0. "Connection closing to [IP::client_addr]"
} 
}