I just replaced a Netscreen firewall with an ASA 5515-X. Everything works, almost! The Netscreen allowed clients on the guest network to access NATed hosts on the DMZ and inside interfaces, with their Internet addresses. There was nothing special about, it just worked. I think on the ASA I need to setup a hairpin or U-turn to make this work. I have looked around and not sure I understand it, so I'm asking here.
Here's my config. No vlans on the ASA just individual interfaces.
outside #.#.#.#/28 From ISP
inside 10.0.0.0/8 internal DNS
guest 192.168.1.0/24 external DNS
dmz 192.168.2.0/24 exteranl DNS
What I would like is for any client on the guest network to act as if it was any client on the Internet. Is this doable? If so what's the best way to do it?