CAS and Frond end

If I understdan we need to DNS record on the public DNS for instance:
mycompany.com and legacy.mycompany.com
when a user types mycompany.com on the browser it will be forwarded to our firewall external interface then Natted to CAS role, and if CAS server finds that the client s mailbox is in exchange 2003 it will redirect the client back to the public DNS and point it to legacy.mycomapny.com and the client will take another trip back to our firewall external  interface.
Up to this point how does the Firewall/NAT know that this connection needs to go to exchange Front End?

thanks
jskfanAsked:
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maxsmith5kCommented:
legacy.mycompany.com will resolve to a different IP address than mail.mycompany.com.

This means that you need 2 public ip addresses.  One for the 2003 environment and one for the 2010 environment.
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jskfanAuthor Commented:
I know we have been through this before, but since the thread was already too long , I didn't want to stretch it further.
OK, there will be 2 DNS recors at the public DNS , one for legacy.mycompany.com and one for mail.mycompany.com.
and you are saying there will be 2 public DNS servers , so:
**how are they configured on the DNS public to point to our firewall/NAT external interface
**how is our firewall/NAT configured to distinguish between the connection that will go to CAS and the connection that will go to FE?

Thanks


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AkhaterCommented:
the firewall cannot differentiate that's why he told you you need 2 public IP addresses

mail.domain.com -> IP1 -> Natted to CAS 2010
Legacy.domain.com -> IP2 -> Natted to 2k3 front end



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jskfanAuthor Commented:
maybe I am not understanding that a firewall/NAT,even with one external physical interface, can receive multiple IP addresses and NAT them to multiple IP addresses.
example:
If you receive IP1 NAT it to CAS server IP address
if you receive IP2 NAT it to FE server IP address
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AkhaterCommented:
Sure it can, it can have miltiple ips and you bind each to a different internal ip thru nat
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jskfanAuthor Commented:
thank you guys
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