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IAS / Radius basics

Wanted to implement RADIUS in our network. Had a few queries in mind.

1. Is there any difference between IAS version of Standard Server 2003 and Ent. 2003.
2. Are there any security precautions that needs to be taken while hardening IAS server byond running the Security Configuration Wizard, specific role of IAS?
3. In a partially cisco environment, which one makes more sense...TACACS+ or IAS?

Any idea...when DIAMETER would be ready for implementation?
http://tools.ietf.org/html/rfc4005
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Solution Architect
Top Expert 2005
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Summarise: IAS on 2003 Enterprise Edition allows unlimited clients vis a vis 50 only on Standard enition.
Excerpted:
"You can configure IAS in Windows Server 2003, Standard Edition, with a maximum of 50 RADIUS clients and a maximum of 2 remote RADIUS server groups. You can define a RADIUS client using a fully qualified domain name or an IP address, but you cannot define groups of RADIUS clients by specifying an IP address range. If the fully qualified domain name of a RADIUS client resolves to multiple IP addresses, the IAS server uses the first IP address returned in the DNS query. With IAS in Windows Server 2003, Enterprise Edition, and Windows Server 2003, Datacenter Edition, you can configure an unlimited number of RADIUS clients and remote RADIUS server groups. In addition, you can configure RADIUS clients by specifying an IP address range."

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