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Forum Discussion

sb_2323_80570's avatar
sb_2323_80570
Icon for Nimbostratus rankNimbostratus
Mar 06, 2009

Newbie PAT question

Hi,     Im new to writing iRules so apologies in advance, Im looking to write an iRule that redirects a client based on the last octet of a vserver to a particular port.     Eg ...
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Mar 06, 2009
I see. I haven't tested this, but I think you could use the default load balancing algorithm to choose the pool member IP address and then change the destination port based on the last octet of the requested IP address.

LB_SELECTED is an event triggered when a load balancing decision is made. You can get details on the other commands on the iRule wiki (Click here). 

 
 when LB_SELECTED { 
  
    log local0. "[IP::client_addr]:[TCP::client_port]: Request to VS [IP::local_addr]:[TCP::local_port]\ 
       Default selection: [LB::server]" 
  
     Use the node command to change the destination port of the selected pool member 
    node [LB::server addr] [getfield [IP::local_addr] "." 4] 
  
    log local0. "[IP::client_addr]:[TCP::client_port]: Changing to node:\ 
       [LB::server addr] [getfield [IP::local_addr] "." 4]" 
 }

Aaron