13 Apply the default scheme for accounting on telnet login users.[3Com]login-method accounting-mode login telnet default14 Enable accounting on Serial0, and configure and apply the default accountingscheme.[3Com] aaa accounting-scheme ppp default radius template tactemplate1[3Com]interface Serial0[3Com-Serial0]link-protocol ppp[3Com-Serial0]ppp accounting default[3Com-serial0] quit15 Assign an IP address to Ethernet0.[3Com]interface ethernet 0[3Com-ethernet0]ip address 10.110.1.10 255.255.0.016 Assign an IP address to Ethernet1.[3Com-ethernet0]interface ethernet 1[3Com-ethernet0]ip address 192.10.1.1 255.255.255.0[3Com-ethernet0]return2.7 TroubleshootingA user always fails to pass the authentication implemented through TACACS+.Do the following:z Check whether the correct user name and password and the available servicesfor the user have been configured on the TACACS+ server.z Check whether the TACACS+ server can be pinged, and whether the correctaddress and port number and shared-key of the server have been configured onthe router.z Use the host command to reconfigure the TACACS+ server. Due to the failure incommunicating with the RADIUS server, the system regards the RADIUS serveras unavailable. In this case, you can use the undo host command to remove theRADIUS server that has been configured, and then use the host command toreconfigure the RADIUS server. Thus, the RADIUS server will be able to workwithout any delay.z Check proper configurations have been made for the TACACS+ server andwhether the modifications just made have taken effect.3Com Router Configuration Guide Addendum for V1.2027