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I have a Cisco ASA 5510 running 9.1(4), presently i have a static nat port forwarding all inbound TCP 25 traffic to an internal email scanner's IP address. This is all working fine.<br />
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What i would like to know is whether it is possible to setup the ASA NAT config in such a way that if the email scanner failed the ASA would would then NAT all inbound TCP 25 traffic to another specified internal device.<br />
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I had in mined something like setting up sla monitoring to the email scanner from the ASA and if it failed to responed having a backup or lower priority NAT kickin.<br />
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I have found examples of using this method with outbound dynamic natting to two different ISP's but have had no luck finding any examples of a solution similar to what i would like to achieve.
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I have a Cisco ASA 5510 running 9.1(4), presently i have a static nat port forwarding all inbound TCP 25 traffic to an internal email scanner's IP address. This is all working fine.

What i would like to know is whether it is possible to setup the ASA NAT config in such a way that if the email scanner failed the ASA would would then NAT all inbound TCP 25 traffic to another specified internal device.

I had in mined something like setting up sla monitoring to the email scanner from the ASA and if it failed to responed having a backup or lower priority NAT kickin.

I have found examples of using this method with outbound dynamic natting to two different ISP's but have had no luck finding any examples of a solution similar to what i would like to achieve.

Cisco ASA NAT with backup

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.

Hardware Firewalls

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.