Hello Marc ,
You can configure multile IPs in same interface , thats not a problem .
Eg : ge-0/0/3 {
unit 0 {
family inet {
address 1.1.1.1/24;
address 1.1.1.2/24;
address 1.1.1.3/24;
address 1.1.1.4/24;
}
}
}
Rest fold with same configuration . It does not matter untill the filters are applied to the LAn interface to route traffic based on Source IP