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2 wan on isa

Posted on 2008-10-11
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Last Modified: 2012-05-05
2 wan on isa
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Question by:cardtrail1
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by:Keith Alabaster
ID: 22696609
Not a supported configuration
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Expert Comment

by:Stephen Manderson
ID: 22696972
As Keith already pointed out this cant be done via ISA.

You need to look into a dual wan router option to sit infront of the ISA server.

Regards
Steve
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by:EricTViking
ID: 22697325
Tis true, here's the official word on the subject - http://technet.microsoft.com/en-us/library/cc302678.aspx

Scroll down about a page or so....

"Network and Routing Issues
This section describes network and routing issues and solutions.

ISA Server Does Not Support Multiple External Interfaces
Problem: ISA Server does not support multiple external connections to the Internet.

Cause: ISA Server does not support configuring multiple connections on the External network adapter.

Solution: No workaround. There are a number of third-party products that may provide a solution. For more information, see High Availability and Load Balancing at the Windows Server System Web site."
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Keith Alabaster earned 500 total points
ID: 22697473
Have to be a little careful there..... I deliberately worded my comment carefully because the scenario is not supported (and bearing in mind the ridiculously little info in the question). However, it can certainly be done and ISA will use both links but it is not ISA that carries out the setup activity - it is the host OS and the routing tables (static routes0 that are assigned. ISA is not a router but Windows is, so if two nics were installed - one for each wan connection then (only at layer 3) the OS could use both links dependant on destination IP addresses. This cannot be done though on a protocol basis.

Keith
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