3Com 8800 Configuration Manual page 622

3Com Switch 8800 Configuration Guide
There might be some communication fault between NAS and RADIUS/TACACS+
server, which can be discovered through pinging RADIUS/TACACS+ server from
NAS. So please ensure the normal communication between NAS and
RADIUS/TACACS+ server.
II. Symptom: RADIUS/TACACS+ packet cannot be transmitted to
RADIUS/TACACS+ server.
Solution:
The communication lines (on physical layer or link layer) connecting NAS and
RADIUS/TACACS+ server may not work well. So please ensure the lines work
well.
The IP address of the corresponding RADIUS/TACACS+ server may not have
been set on NAS. Please set a proper IP address for RADIUS/TACACS+ server.
UDP ports of authentication/authorization and accounting services may not be set
properly. So make sure they are consistent with the ports provided by
RADIUS/TACACS+ server.
III. Symptom: After being authenticated and authorized, the user cannot send
charging bill to the RADIUS/TACACS+ server.
Solution:
The accounting port number may be set improperly. Please set a proper number.
The accounting service and authentication/authorization service are provided on
different servers, but NAS requires the services to be provided on one server (by
specifying the same IP address). So please make sure the settings of servers are
consistent with the actual conditions.
Chapter 40 AAA and RADIUS/TACACS+ Protocol Con
40-35
figuration