[Help] How to write iRule to select default gateway based source IP address?

Hi,

you can use an irule like this one (rule edited after Kai comments about IP::addr performances):

when RULE_INIT {
    array set static::SnatPolicy {
        "10.1.1.1" {"Pool_ISP1" "178.102.1.105" ""}
        "10.1.1.2" {"Pool_ISP1" "178.102.1.104" ""}
        "default" {"default_gateway_pool" "178.102.1.104" "122.255.27.144"}
    }
}

when CLIENT_ACCEPTED {
     Check if destination address is local
    if {[IP::addr [IP::local_addr] equals 192.168.0.0/16] || [IP::addr [IP::local_addr] equals 10.0.0.0/8] || [IP::addr [IP::local_addr] equals 172.16.0.0/12]} {
        pool internal_router
    } else { 
        if { [info exists static::SnatPolicy([IP::client_addr])]}{
            set clientip [IP::client_addr]
        } else {
            set clientip "default"
        }
        pool [lindex $static::SnatPolicy($clientip) 0]
    }
}

when LB_SELECTED {
    if { [IP::addr [LB::server addr]/28 equals 178.102.1.96]} {
        set link 1
    } else {
        set link 2
    }
    snat [lindex $static::SnatPolicy($clientip) $link]
}