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A router with Cisco IOS version 12.4 sends the NAS-Port-Type RADIUS attribute twice in an AAA request
This problem occurs due to the presence of Cisco bug ID CSCsc96280.
Sometimes, a router acts as a VPN server for VPN client users. When such a router is upgraded to Cisco IOS Software Release 12.4(6.7), the router sends the NAS-Port-Type RADIUS attribute twice in an Authentication, Authorization, and Accounting (AAA) access-request packet. This problem occurs when the router is configured to authenticate VPN users against the RADIUS server. The logs display entries similar to this: