I got the following message from my radius.log.
Wed May 23 16:39:11 2007 : Error: Received Accounting-Response packet from
172.16.1.1:1813 with invalid signature (err=2)! (Shared secret is incorrect.)
Wed May 23 16:39:11 2007 : Error: Reply from home server
172.16.1.1:1813 - ID: 180 arrived too late for request 2515449. Try increasing 'retry_delay' or 'max_request_time'
It caused some problem on accounting record .
The secret between NAS and RADIUS are the same.
But the log tell me the secret is incorrect at Accounting-Response.
PS. NAS and Radius are in the same subnet without any firewall.