NAC L3 OOB VGW possible?

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Nov 28th, 2008
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is it possible to do L3 NAC OOB with VGW.

The documentation does not say that it is not possible, but i see some technical difficulties.


In VGW deployment, the Auth IP = Access IP and only the vlan id changes. But on the other end of an L3 link I cannot see vlan id's and there for cannot distinguish between Auth and Access.


So is it correct that OOB L3 VGW is not possible?

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grant.maynard Mon, 12/01/2008 - 16:16
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It is my understanding that the IP address of the client must change when it moves from auth to access.

It is still OOB because traffic only goes through the CAS during authentication/remediation. Because there are no VLAN mappings it is not VGW.

Typically the CAS is at a core location, and you use policy routing or ACLs to separate auth traffic from access (though i prefer VRF) to "pipe" auth traffic back to the CAS.

Once auth is successful, the CAM switches the port to the access vlan.

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