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Cisco ASA hairpin for guest network

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?

Thanks...Jim

JimNowotny

ASKER

This is version 9.1

Quori

This is possible and is source NAT, but it'll appear to come from the IP address of the ASA interface, and you'll lose a lot of information useful to auditing. Is this really what you want? Its not great from a security point of view.

If so, are the interfaces (DMZ and Guest) the same security level?

JimNowotny

ASKER

They are not, but can be. Right now the the DMZ is 50 and Guest is 25.

Jan Bacher

A couple of things:

1) Don't change the security level, they're different for good reason
2) Do nat exemption between the guest and dmz networks
3) Create an access-list for guest network (in) allowing traffic to the dmz for only those services to specific IPs that need to be reached by guests.

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JimNowotny

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JimNowotny

ASKER

No good answer