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William_Benett1's avatar
William_Benett1
Icon for Nimbostratus rankNimbostratus
Mar 28, 2007

TCL capabilities in iRules

So i'm working on an iRule that will require me to do bitwise math in order to determine if the port number is odd or even. I believe I looked up the operator (&) but the iRuler gives me a syntax err...
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Joe_Pruitt's avatar
Joe_Pruitt
Mar 28, 2007
The bitwise AND operator "&" is supported. Could you post the segment of your iRule that is causing the problem? Likely it is something else in your assigment. You might need to wrap the math in an "expr" command.

http://tmml.sourceforge.net/doc/tcl/expr.html

Click here

If you could post your iRule, I'll take a look...

This should work:

when HTTP_REQUEST {
  set port_is_odd [expr [TCP::local_port] & 1]
  if { $port_is_odd } {
    log local0. "Port [TCP::local_port] is odd"
  } else {
    log local0. "Port [TCP::local_port] is even"
  }
}

-Joe