[c-nsp] Using NAT with servers and dual ISP

[David Prall]

> > My consfusin is handling inbound connections to the customer servers.
> > I can define inbound static mappings but how do the packets that the
> > server sends in response make it way through the router and avoid
> > going out the wrong interface.
> 
> Although it is a bit of a hack, one way of doing this is to put a
> second IP
> address on the server in question and NAT to that address on the second
> inbound service instead. That way you can identify the packets.
> 
> B.
> 


And use PBR to return based on source address. You can also use DNS to load
balance the requests to each address based on site, and if you want to get
fancy use views to respond to requests via the interface they were received
on with addresses on that interface.

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