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Why do you want to do that? Perhaps there is a better solution for your problem.
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
This is not supported. The other NICs are to be used as a probe, of if you are deploying an inline posture node, then nic 1 and nic 2 are used for the untrusted and trusted interface.
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There can be up to 4 NICs defined on ISE
In ISE 1.1.1 the management interface can be accessed only on Eth0. However, ISE will listen on all defined NICs for RADIUS requests
I am not sure of the answer to your question on the default gateway and will check this out