OK, I have read many discussions about this, but never found the answer. We were provided a /28 range of IP addresses from our ISP. We currently plug the ISP connection straight into port 3 on the PA. I would now like to add a Juniper SRX behind the PA, with a public IP so our VPN routers in the field can connect. Seems straight forward.
In the past I have seen similar configurations on the Cisco 2811 routers, one public WAN interface, then other ports were setup so you could put a public IP on another device on the inside have access.
How would I do this on a PA?
If you would like for the juniper appliance to have a external IP address you will need to burn two additional ports on the palo alto. the two newly configured ports will be set up in vwire (bridge mode). you will also need a switch in front of the palo alto as well. one port will plug into an upstream switch were the public interface of the palo alto will also plug in and also the cable from the isp will need to plug into this switch. the other end of the vwire will plug into the juniper.
you can also go another route with having the juniper a private ip address on the internal side of the palo alto and create a static nat on the palo to forward anything to that public ip to the juniper.
I would recommend to setup the SRX in a DMZ of the Palo Alto and use a private IP address for the SRX and NAT it to public address on the PA-500. This way you just need to use one additional interface on the PA-500 and with this setup you can control the traffic to/from the SRX on your PA-500 (encrypted and decrypted traffic).
The VWIRE solution already mentioned is the first thing that comes to mind for me as well. The Paloalto has a Virtual router configured with Layer 3 interfaces and IP addresses. The router sits in parallel with the Paloalto VR. But on the router connects to the Internet through the VWIRE, allowing inspection of the traffic destined to the router.
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