Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 637
Command Authorization, Protection from TCP Tiny and Overlapping Fragment Attacks, SCP and SSH
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To delete a TACACS+ server host, use the no tacacs-server host {hostname | ip-address} command. freebsd2# telnet 2200:2200:2200:2200:2200::2202 Trying 2200:2200:2200:2200:2200::2202... Connected to 2200:2200:2200:2200:2200::2202. Escape character is '^]'. Login: admin Password: Force10# Force10# Command Authorization The AAA command authorization feature configures FTOS to send each configuration command to a TACACS server for authorization before it is added to the running configuration. By default, the AAA authorization commands configure the system to check both EXEC mode and CONFIGURATION mode commands. Use the command no aaa authorization config-commands to enable only EXEC mode command checking. If rejected by the AAA server, the command is not added to the running config, and messages similar to Message 1 are displayed. Message 1 Configuration Command Rejection 04:07:48: %RPM0-P:CP %SEC-3-SEC_AUTHORIZATION_FAIL: Authorization failure Command authorization failed for user (denyall) on vty0 ( 10.11.9.209 ) Protection from TCP Tiny and Overlapping Fragment Attacks Tiny and overlapping fragment attack is a class of attack where configured ACL entries-denying TCP port-specific traffic-can be bypassed, and traffic can be sent to its destination although denied by the ACL. RFC 1858 and 3128 proposes a countermeasure to the problem. This countermeasure is configured into the line cards and enabled by default. SCP and SSH Secure Shell (SSH) is a protocol for secure remote login and other secure network services over an insecure network. FTOS is compatible with SSH versions 1.5 and 2, both the client and server modes. SSH sessions are encrypted and use authentication. For details on command syntax, see the Security chapter in the FTOS Command Line Interface Reference. Security | 637
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