HP 6125G HP 6125G & 6125G/XG Blade Switches Security Configuration Gui - Page 18

Figure 6 Basic HWTACACS message exchange process for a Telnet user Host HWTACACS client HWTACACS server 1) The user logs in 4) Request for username 5) The user inputs the username 8) Request for password 9) The user inputs the password 14) The user logs in successfully 17) The user logs off 2) Start-authentication packet 3) Authentication response requesting the username 6) Authentication continuance packet with the username 7) Authentication response requesting the login password 10) Authentication continuance packet with the login password 11) Authentication response indicating successful authentication 12) User authorization request packet 13) Authorization response indicating successful authorization 15) Start-accounting request 16) Accounting response indicating the start of accounting 18) Stop-accounting request 19) Stop-accounting response HWTACACS operates in the following manner: 1. A Telnet user sends an access request to the HWTACACS client. 2. Upon receiving the request, the HWTACACS client sends a start-authentication packet to the HWTACACS server. 3. The HWTACACS server sends back an authentication response to request the username. 4. Upon receiving the response, the HWTACACS client asks the user for the username. 5. The user enters the username. 6. After receiving the username from the user, the HWTACACS client sends the server a continue-authentication packet that carries the username. 7. The HWTACACS server sends back an authentication response, requesting the login password. 8. Upon receipt of the response, the HWTACACS client asks the user for the login password. 8