how to configure FreeRADIUS with sshd

[qiyunfeng01]

I am using pam_radius_auth on my ssh server, so that each time when I ssh to that server, it'll go to our radius server to do the authentication. It works fine if my own username exists both on the radius server and on the ssh server. But I just want to keep one general account on my ssh server, so that each time when I ssh to my ssh server, it'll go to the radius server to authenticate my username and password, and then let me logon the ssh server as the general account user. How can I go about doing this? Thanks!