RE: one external IP to multiple internal IPs? Ideas?

["Sims, Ken" <KSIMS@xxxxxxxxxxxxxxxx>]

Hi Brad -

>Yes, we have those set up, but they are in our DMZ.  So, they must point to
>an external IP.  Then, the firewall routes that IP to a sigle IP inside our
>firewall.  What I wish we could do (and I'm sure there's a way but don't
>know enough about it) is to send the DNS name to an internal entry behind
>our firewall, thus, sending a single IP to multiple internal IPs.

As has already been pointed out, your name servers must pass an external IP
address back to the client browser, otherwise you cannot be accessed through
the public internet.

Since the host name must be passed through, otherwise the virtual hosts
method wouldn't work, here is an idea:

Map the one external IP address to one internal IP address.
Write a proxy server type program that:
  listens on port 80 for that IP address
  looks at the host name on all incoming requests
  passes the request to port 80 to the specific IP address that
    you want to use for that subdomain
  when a response comes back, passes it back out on port 80 on
    the IP address that is mapped in the router

This could be done on the AS/400 itself, or on a separate system.

Ken



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