iRule Creation Query

Hi,

Have created a very simple iRule to extract the incoming Client destination TCP ports using the switch cmd to redirect to specific nodes:

when HTTP_REQUEST  {

    switch { TCP::local_port clientside }               <<<< Incoming Destination TCP port

         8001  {node 10.100.10.101 6660}                 <<<< “Node” cmd routes to a Server – no pool member nor configuration objects required.

         8002  {node 10.100.10.102 6660}

         8003  {node 10.100.10.103 6660}

         8004  {node 10.100.10.104 6660}

                       “                        “

                       “                        “

         8150  {node 10.100.10.150 6660}

}

However, the above is somewhat cumbersome, therefore I would like to "optimize" the irule via the introduction of a simple loop mechanism to reduce the number of statements, but unable to apply the logic for the updated irule creation:

For example: something like the following...........

when HTTP_REQUEST  {

set dport { TCP::local_port clientside }

set TCP 8001

for {set IP 101} {$dport=$TCP} {incr IP}

switch { node 10.100.10.{$IP} 6660}

}

So my question is how do I update the "conditional" part {$dport=$TCP} to perform a nested loop? in order to match on the incoming TCP to the corresponding outbound Node IP address? Perhaps the question should be how do I perform nested "FOR" loops?

Any thoughts, hints or pointers would be most appreciated.

Thanking you

Cheers

Drew