We can do that. As per below rule 1.1.1.1 can get SNAT to 4.4.4.4/8.8.8.8/12.12.12.12
[edit]
root@SRX# show security nat
source {
pool Multiple-Public-IP {
address {
4.4.4.4/32;
8.8.8.8/32;
12.12.12.12/32;
}
}
rule-set 1-pvt-to-many-public {
from zone trust;
to zone untrust;
rule test {
match {
source-address 1.1.1.1/32;
}
then {
source-nat {
pool {
Multiple-Public-IP;
}
}
}
}
}
}
[edit]
root@SRX# show security nat | display set
set security nat source pool Multiple-Public-IP address 4.4.4.4/32
set security nat source pool Multiple-Public-IP address 8.8.8.8/32
set security nat source pool Multiple-Public-IP address 12.12.12.12/32
set security nat source rule-set 1-pvt-to-many-public from zone trust
set security nat source rule-set 1-pvt-to-many-public to zone untrust
set security nat source rule-set 1-pvt-to-many-public rule test match source-address 1.1.1.1/32
set security nat source rule-set 1-pvt-to-many-public rule test then source-nat pool Multiple-Public-IP