Strange behavior by LB::select

Hello,

I have a specific problem that I'm trying to solve. I need to send UDP traffic to specific pools and ports based on source IP. I have written a small iRule that should work for this but I'm having problems with LB::select. Specifically it's not returning anything at all when the VIP is using an UDP profile. If I switch it to TCP it works as described on the Wiki.

Also, when using TCP and LB::select returns the expected data, "eval"-ing it does not work. It does not change the port as expected.

This is the code:

when CLIENT_ACCEPTED {

log local0. "Radius query from [IP::client_addr]"

switch [IP::client_addr] {

"10.1.1.1" {

set pool_selection "pool-00"

set port_selection "5001"

}

"10.1.1.2" {

set pool_selection "pool-01"

set port_selection "5004"

}

default {

not known source, drop packet.

log local0. "Unknown source, dropping..."

drop

}

}

log local0. "Will try for pool $pool_selection and port $port_selection"

pool $pool_selection

set selection [LB::select]

set final_selection [lreplace $selection 4 4 $port_selection]

log local0. "LB-select output: $selection -> $final_selection"

eval $final_selection

}

And this is the output, first with UDP:

May 15 20:16:25 tmm tmm[1135]: Rule test-irule1 : Radius query from 10.1.1.2

May 15 20:16:25 tmm tmm[1135]: Rule test-irule1 : Will try for pool pool-01 and port 5004

May 15 20:16:25 tmm tmm[1135]: Rule test-irule1 : LB-select output: -> 5004

May 15 20:16:25 tmm tmm[1135]: 01220001:3: TCL error: Rule test-irule1 - invalid command name "5004" while executing "5004" ("eval" body line 1) invoked from within "eval $final_selection"

and with TCP:

May 15 20:15:36 tmm tmm[1135]: Rule test-irule1 : Radius query from 10.1.1.2

May 15 20:15:36 tmm tmm[1135]: Rule test-irule1 : Will try for pool pool-01 and port 5004

May 15 20:15:36 tmm tmm[1135]: Rule test-irule1 : LB-select output: pool pool-01 member 192.168.1.10 0 -> pool pool-01 member 192.168.1.10 5004

May 15 20:15:36 tmm tmm[1135]: Rule test-irule1 : in LB_SELECTED

May 15 20:15:36 tmm tmm[1135]: Rule test-irule1 : pool: pool-01

May 15 20:15:36 tmm tmm[1135]: Rule test-irule1 : addr: 192.168.1.10

May 15 20:15:36 tmm tmm[1135]: Rule test-irule1 : port: 0

As you can see it's dosen't quite work in the TCP-case either, it ignores the port that is quite clearly present in the pool-command that is evaluated.

Any ideas what could be going on? I'm mostly interested in the UDP case since that what I need to get working. The TCP-one was just for troubleshooting.

Regards,

Fredrik Lindgren