NimbostratusiRule 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
Hi Drew,
Can you try this iRule?
when HTTP_REQUEST { set port [TCP::client_port] # log local0. "Port: $port" if { ($port > 8000) and ($port < 8151) } { set newlastoctet [expr $port - 7900] # log local0. "NewLastOctet: $newlastoctet" node "10.100.10.$newlastoctet:6660" } }
