I am deploying Cisco ISE 1.2 in a distributed deployment and the requirement is to use external Radius proxy feature. ISE PSNs are designed to have 2 L3 NIC's, Eth0 for administration and Eth1 as client side facing NIC for Radius requests. I am interested to know would Cisco ISE in version 1.2 use Eth1 interface to send RADIUS authentication request to external RADIUS Proxy server.
Could not find above information in Cisco SNS-3400 Series Appliance Ports Reference.
Cisco ISE uses standard RADIUS authentication and authorization port to send request to Exteranl RADIUS proxy. As per the interface/port refrence guide of version 1.2 this is listed that is causing a confusion :-
Policy Service node
•UDP:1645, 1812 (RADIUS Authentication)
•UDP:1646, 1813 (RADIUS Accounting)
•UDP: 1700 (RADIUS change of authorization Send)
•UDP: 1700, 3799 (RADIUS change of authorization Listen/Relay)
External Identity Stores and Resources
•TCP: 389, 3268, UDP: 389 (LDAP)
•TCP: 445 (SMB)
•TCP: 88, UDP: 88 (KDC)
•TCP: 464 (KPASS)
•UDP: 123 (NTP)
•TCP: 53, UDP: 53 (DNS)
(Admin user interface authentication and endpoint authentication)
In external Identity Stores and Resources it says Eth0 is used for (Admin user interface authentication and endpoint authentication), where under sessions it lists that all ports can be used for RADIUS Authentication and Authorization.
I am not sure what I am missing to understand between the two if you can highlight that.
For External Idenity sources Cisco ISE would use Eth0 as the default and only interface to communicate with them. But in case of exteranl RADIUS proxy request its not bounded to Eth0 interface and rather depends on the route on Cisco ISe.
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