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Document any extra privileges that are given to users on the network For example, if you allow Bob to back up files from the server, then you want to be sure to document those extra rights It is important to document your audit policy so that at any point and time you can determine what level of auditing is enabled on the network Be sure to document what events are being audited and whether you are auditing the success or failure of a given event An important network feature to document is the firewall policy When documenting the firewall policy, document what the default rule is, either accept all traffic or deny all traffic, and then document each rule You don t want to have to rebuild all those rules without any reference! The software restriction policy will determine what applications are allowed to run on the computers You want to be sure to document the rules in the software restriction policy so that if you have problems with an application running, you can refer to the policy to find out if there is a reason the application does not run

Only the network administration staff needs to know the Enable password or secret that allows a user into privileged mode, and it therefore should be obscure and changed frequently It is part of a network administrator's job to keep track of such things The Enable secret is always encrypted in the router configuration If privileged mode access to a router is given through an Enable password, it should be encrypted in the configuration as follows: Router1(config)#service password-encryption This command is followed by no arguments and encrypts all password displays Centralizing Router Access It generally is good practice to limit any type of remote access to routers on your internetwork to a limited set of network numbers It's typical for one network number to be dedicated for use by network administrative staff only It is then possible to configure a router to accept network connections that can be used for router management functions only if they originate with this particular network It is possible to restrict this type of access to just one service, such as Telnet, from a central location Ping, SNMP, and TFTP are useful utilities when managing remote devices; however, so restricting access to just one network number usually is sufficient This can be achieved by implementing a simple access list on all routers Access list 13, shown next, (defined in global configuration mode) identifies the network used by administration staff to get to the routers, which is the 200110 network Router1(config)#Access-list 13 permit 200110 000255 Once this list has been defined, it must be applied to an interface If this list is applied to the virtual terminal lines, because the only connections coming into these ports are Telnet sessions, the only Telnet sessions accepted will be those that originate from the 200110 network Applying this access list to the virtual terminal lines is done via the access-class command as shown: Router1(config)#line vty 0 4 The TACACS Security System The discussion so far has centered around defining access configurations on each individual router It is possible to centralize password administration for a large number of remote routers by using the TACACS system TACACS stands for the Terminal Access Controller Access Control System Though TACACS usually is deployed to centralize management of CHAP usernames and passwords, which are defined on a per-interface basis, it also can be used to authenticate users seeking Telnet (and hence Enable) access to a router TACACS provides the freedom to authenticate individual users and log their activity, whereas an Enable password defined on a router is a global configuration and its use cannot be traced to a specific user To configure this type of access checking, you need to set up the TACACS daemon on a Unix machine, configure all routers to reference that Unix machine for TACACS authorization, and configure the virtual terminals to use TACACS to check login requests Assuming that a Unix machine is appropriately configured for TACACS, with the address 210111, the configuration for each remote router to will be as follows:.

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