HTTP redirect iRule brings Virtual Server to refuse connections after 10 minutes

Hi All,

 

 

I've created an iRule that redirects any HTTP GETs to two different destinations (A & B) based on clock ticks (even and odd) or to destionation A if new request rate exceeds a threshold.

 

 

Everything works pretty cool, till something happens and the Virtual Server got stucked refusing any new connection on port 80. Any action on it (enable/disable, iRule modification, etc) brings everything back to normal work. Each client is supposed to be hitting the virtual server once every 10 seconds and the issue appears after 10/20 minutes.

 

 

Can anyone give me a hint on what's wrong with it?

 

 

Many thanks for now....

 

 

 

when RULE_INIT {

 

set static::rate 5

 

set static::interval 15

 

set static::tbl "table"

 

}

 

 

when HTTP_REQUEST {

 

set key [IP::client_addr]

 

set tbl ${static::tbl}_[virtual name]

 

set current [table keys -subtable $tbl -count]

 

if { $current >= $static::rate } {

 

HTTP::respond 302 Location A }

 

else {

 

table set -subtable $tbl $key " " indefinite $static::interval

 

set key [crc32 [clock clicks]]

 

set key [expr {$key & 1}]

 

switch $key {

 

0 {

 

HTTP::respond 302 noserver Location A }

 

1 {

 

HTTP::respond 302 noserver Location B }

 

}

 

}

 

}