Nortel Networks 43W7774 manual Cfg/sys/tacacs+, TACACS+ Server Configuration

Alteon OS Command Reference

/cfg/sys/tacacs+

TACACS+ Server Configuration

TACACS (Terminal Access Controller Access Control system) is an authentication protocol that allows a remote access server to forward a user's logon password to an authentication server to determine whether access can be allowed to a given system. TACACS is an encryption protocol, and therefore less secure than TACACS+ and Remote Authentication Dial-In User Service (RADIUS) protocols. (Both TACACS and TACACS+ are described in RFC 1492.)

TACACS+ protocol is more reliable than RADIUS, as TACACS+ uses the Transmission Con- trol Protocol (TCP) whereas RADIUS uses the User Datagram Protocol (UDP). Also, RADIUS combines authentication and authorization in a user profile, whereas TACACS+ separates the two operations.

TACACS+ offers the following advantages over RADIUS as the authentication device:

„TACACS+ is TCP-based, so it facilitates connection-oriented traffic.

„It supports full-packet encryption, as opposed to password-only in authentication requests.

„It supports de-coupled authentication, authorization, and accounting.

[TACACS+ Server		Menu]
prisrv	-	Set IP address of primary TACACS+ server
secsrv	-	Set IP address of secondary TACACS+ server
secret	-	Set secret for primary TACACS+ server
secret2	-	Set secret for secondary TACACS+ server
port	-	Set TACACS+ port number
retries	-	Set number of TACACS+ server retries
timeout	-	Set timeout value of TACACS+ server retries
telnet	-	Enable/disable TACACS+ backdoor for telnet/ssh/http
secbd	-	Enable/disable TACACS+ secure backdoor for telnet/
cmap	-	ssh/http
		Enable/disable TACACS+ new privilege level mapping
passch	-	Enable/disable TACACS+ password change
chpass_p -		Set new password for primary server
chpass_s -		Set new password for secondary server
cauth	-	Enable/disable TACACS+ command authorization
clog	-	Enable/disable TACACS+ command logging
on	-	Enable TACACS+ authentication
off	-	Disable TACACS+ authentication
cur	-	Display current TACACS+ settings

182 „ The Configuration Menu 43W7774, May 2007