iRule - A lot of urls with single VIP

Richard,

Like Michael said you can you policies in 11.4 and up.

https://support.f5.com/kb/en-us/solutions/public/15000/000/sol15085.html

In an iRule you can do it many ways but using the switch is cleaner and will be more efficient. Something like:

when HTTP_REQUEST {
                set http_host [string tolower [HTTP::host]]
                set pool1 "poola"
                set pool2 "poolb"
                set pool3 "poolc"
                set default "default_pool"
                switch -glob [$http_host] {
                  "*.test.a.com" {
                               pool $pool1
                   }
                   "*.test.b.com" -
                   "b.com" {
                               pool $pool2
                   } 
                   "www.c.com" {
                                pool $pool3
                   }
                   default {
                              pool $default         
                   }
        }
}

Switch: https://devcentral.f5.com/articles/irules-101-04-switch

-Chad