We have a /24 public IP network where some of the IPs will not NAT and some will NAT. For the scenario were there will be no NAT, the host behind the PaloAlto will have a public IP assigned to the NIC. Under what scenario would I break up the /24 into smaller subnets or leave the subnet as a large /24. This is for a pa-500 in Layer 3 configuration, where there is a separate public /29 that is assigned to the PaloAlto, the /24 is routed to an IP on the public /29.
You should be able to configure the /24 directly on an L3 interface and DNAT any of the IPs in that space to private IPs addresses in other zones.
Untrust 126.96.36.199/29 dmz1 188.8.131.52/24 dmz2 192.168.1.1/24
DNAT rule would read Untrust -> dmz1 -> DstIP 184.108.40.206 -> DNAT IP 192.168.1.2
Your security rule would read: Untrust -> dmz2 -> DstIP 192.168.1.2
Just make sure not to use the 220.127.116.11 address in your DMZ1 zone (;
Any reason to not make these all in a VLAN? See this pic. As show in the this PA Doc. securing Inter VLAN traffic. I don't need to router between VLANs, necessarily, but breaking up the /24 into smaller subnets, as shown in that pic, makes security of the networks and management simpler on the switch.
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