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Bind Multiple IP address on External PPPOE Interface

Posted on 2009-05-07
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Last Modified: 2013-12-14
We are currently have a static IP address through a PPPoE connection on our external nic using a Speedstream 4200 DSL modem.  We are expanding and needing to deploy an additional mail server.  To do so we need to bind an additional ip to our external nic.  I do have another one available from my ISP.  My ISA manual does a good job of illustrating how to publish an additional mail server.  However, I can not figure out how to bind the second ip on the nic.  Typically you would just go into the advanced section under the TCP/IP section of the nic configuration.  When you use the Window connection wizard to let Window manage the PPPoE connection the IP address tab under the advanced section disappears.  Anyone know how I can do this?
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Question by:Max_Hammond
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by:Bembi
ID: 24341424
I would say, I'm quite sure, that this will not work.

If you want to use two mails servers for the internet, you need two connections to the internet to seperate them from each other. ISA can not handle multiple internet connections.

The reason is very easy as you can have only one default gateway. If traffic comes in, the response would be routed always via the default gateway. And that would cause that traffic comes in via one line and goes out via the other. The responding route will not the same than the original incoming route.

Also as I know, you can establish only one connection via PPPoE from the server. And this make sense in that way.
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by:Max_Hammond
ID: 24342114
Hmm.  Windstream and Shindlers book on ISA Server 2004 clearly differ with your assumption that multiple external ip's cannot be handled through PPPoE and ISA.  Thanks for your help but I have several references to the contrary, just no how-to's on the PPPoE setup.  I respectfully thank you for your comments though.
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