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Enabling Enterprise Multihoming with Cisco IOS Network Address Translation (NAT)

Multihoming with Cisco IOS Network Address Translation






Author:Praveen Akkiraju, Cisco Consulting Engineering


Kevin Delgadillo, Cisco IOS Product Marketing
Yakov Rekhter, Cisco Fellow

An enterprise may wish to acquire its Internet connectivity from more than one Internet Service Provider (ISP) for several reasons. Maintaining connectivity via more than one ISP can be viewed as a way to increase the reliability of Internet connectivity. Such multiply connected enterprises are referred to as being "multi-homed." When connectivity through one of the ISPs fails, connectivity via the other ISP(s) enables the enterprise to preserve its connectivity to the Internet. In addition to providing more reliable connectivity, maintaining connectivity via more than one ISP also enables the enterprise to distribute load among multiple connections. For enterprises that span wide geographical areas, this could also enable better (more optimal) routing.



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