NAT Multihoming (was:Re: NANOG 40 agenda posted)

Paul Vixie vixie at
Sat Jun 2 18:07:19 UTC 2007

> Cisco has a whitepaper entitled "Enabling Enterprise Multihoming with Cisco 
> IOS NAT" that addresses this.  See 
> as well as RFC2260.

see also <>.

> There are indeed a few thorny issues with this approach; the largest
> issue is that all connectivity becomes DNS-dependent and raw IP addresses
> (from both the inside and outside) become virtually useless.  Running
> servers behind this scheme, while doable, is difficult.

and also much fun to watch, once you get it working.
Paul Vixie

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