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function, now that authentication and authorization configurations have been defined Within this command we specify what events will trigger accounting, which in this case is the starting or stopping of any outbound Telnet or Rlogin session as defined by the argument connection Logging of the specified events is sent only to the TACACS+ server Command line 1 16 specifies the line range number we are about to configure Command login authentication default sets the methods to be used to authenticate connections on lines 1 through 16 as those specified by the default list These methods for the default list are specified in the aaa authentication login default command Command interface serial 0 identifies the serial interface we are going to configure for authentication Command ppp authentication chap default uses the default list specified in the aaa authentication ppp default command to authorize PPP connections on this interface In summary, there are global authorization commands for login, enable, and PPP access, with each command defining a list name and the authorization methods that will be used on the line or interface the list name is applied to The configuration shown uses the default list (as defined in the global aaa authentication login command) to authenticate login requests on line 1 through 16, and the default list (as defined in the aaa authentication ppp command) for authenticating PPP connections on interface Serial 0 SNMP Security Issues We will discuss the Simple Network Management Protocol (SNMP) as a way of simplifying the management of a large internetwork of routers later in this chapter If you enable SNMP on your routers, you are opening the door for potential security loopholes SNMP can be used to gather statistics, obtain configuration information, or change the configuration of the router An SNMP command issued to an SNMP-enabled router is accompanied by what is known as a community string, which has either read-only or read/write access to the router The community string is used to identify an SNMP server station to the SNMP agent enabled on the router Only when the correct community string is supplied will the router agent act upon the SNMP command With SNMP version 1, this community string is passed over the network in clear text, so anyone who is capable of capturing a packet on the network can obtain the community strings With SNMP version 2, which is supported on Cisco IOS version 103 and later, communication between an SNMP agent and server uses the MD5 algorithm for authentication to prevent unauthorized users from gaining the SNMP community strings If you are using SNMP version 2, there is a further precaution to take to ensure that unauthorized individuals cannot obtain the SNMP community strings, and that is to change the read/write community string to something known only to authorized personnel If SNMP is enabled without a specified community string, the default of public is assumed With this knowledge, unauthorized personnel can gain full SNMP access to any router with an SNMP agent enabled that does not specify an R/W community string.

component of the network This type of topology is seen more commonly in something like the national telephone network

A few final administrative tasks should be completed before the PIX can be deemed productionready First, many administrators like to manage the PIX from a remote device without having to physically visit the PIX Traditionally, this has been done via the telnet protocol In order to access the PIX via a remote telnet session, the IP address of the machine from which you will be administering the PIX must be entered in the PIX configuration The command to do this is telnet local_ip [netmask]

end Each system in the ring regenerates the signal If there is a break in the ring, the entire network goes down

q Cabling is the LAN s transmission medium q Three primary types of physical media can be used: coaxial cable, twisted-pair

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Before we look at the commands to enable the SNMP agent on a router, we need to explore one further concept Access lists are useful for defining which IP addresses can be used by stations

of coax: thinnet and thicknet Hosts connect to thinnet through BNC connectors, whereas vampire taps and drop cables are used to connect to thicknet

The local_ip is the IP address that is allowed to open a telnet session to the PIX The netmask parameter is used to determine the mask of the local_ip The netmaskparameter can be used to allow an entire subnet to access the PIX via a telnet session, although we discourage this practice

eight wires instead of four Telephone cables use an RJ-11 connector, whereas network cabling uses an RJ-45 connector

Timeout intervals are used to interpret the time to travel between hops A normal LAN usually lists devices as being less than 10 milliseconds away By default, two seconds is the timeout before a reply timed out message is generated You can use the -w option to raise this value for troubleshooting

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Use Ping to specify intermediate gateways to test against You can route packets through particular IP addresses or hostnames specified The -j option enables you to specify the hosts to route through The -k option enables you to exclude hosts from this route list The maximum number of hosts you can specify with both options is nine

Use the Ping utility to verify connectivity by IP address or hostname You must be able to resolve the hostname to use this functionality If you are unable to ping by hostname, but you can ping by IP address, you most likely will have a nameresolution problem If you are receiving reply timed out messages, you might try to bump up the timeout value with the -w option Maybe the packets are arriving but are timing out before two seconds After bumping up the value, if the replies are returning, a bandwidth problem might be present Contact the network administrator where the numbers seem to rise Table 6-9 details the ping command-line switches

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The Ping utility uses the ICMP protocol instead of TCP as used by FTP and Telnet ICMP has different types of messages that can be sent;

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