Help! LB with multiple ISP IPs?

I am new to iRule... can any one say to me will this help me or not?

 

 

I have some server NATed with specific IPs. I want this server to use specific pool of ISPs IPs with SNAT.

 

I have LC for two ISPs.

 

 

This is my iRule

 

 

when SERVER_CONNECTED {

 

set THEIP [ IP::server_addr ]

 

switch $THEIP {

 

172.16.1.17 { SNATPOOL SNAT_POOL_17

 

POOL IP_POOL_17

 

}

 

172.16.1.18 { SNATPOOL SNAT_POOL_18

 

POOL IP_POOL_18

 

}

 

172.16.1.19 { SNATPOOL SNAT_POOL_19

 

POOL IP_POOL_19

 

}

 

172.16.1.20 { SNATPOOL SNAT_POOL_20

 

POOL IP_POOL_20

 

}

 

172.16.1.21 { SNATPOOL SNAT_POOL_21

 

POOL IP_POOL_21

 

}

 

172.16.1.22 { SNATPOOL SNAT_POOL_22

 

POOL IP_POOL_22

 

}

 

default{ SNATPOOL SNAT_POOL_VIP

 

POOL IP_POOL_VIP

 

}

 

}

 

}