I have tried by creating "telnet", "xinetd" files in /etc/pam.d/ folder. I have included "auth sufficient pam_radius_auth.so debug" in these files. I have added this line to /etc/pam.d/other file also. I don't have /etc/pam.d/common-auth file i think "other" file is for the same.

but i am not getting the request form pam_radius_auth.so client to my radius server running on different machine. when i checked the log files at client side it shows as below.

Feb 7 10:53:35 (none) xinetd[22737]: START: telnet pid=22769 from=::ffff:10.1.1.101

Feb 7 10:53:44 (none) login(pam_unix)[22770]: account user has password changed in future

Feb 7 10:53:44 (none) login(pam_unix)[22770]: session opened for user user by (uid=0)

Feb 7 10:53:44 (none) login[22770]: ROOT LOGIN on `pts/4' from `10.1.1.101'