By Joe Harris

With this concise, problem-solving advisor, networking execs will the best way to establish community safeguard threats and enforce uniform safeguard all through their networks, safe distant dial-in entry with CiscoSecure ACS and Cisco IOS AAA positive factors, shield web entry on their perimeter routers with the CiscoSecure IOS firewall software program, and enforce safe VPNs utilizing IPSec and Cisco Encryption expertise. step by step directions and speedy suggestions may help directors enforce and replace safety defenses. additionally, each configuration during this ebook was once thoroughly confirmed and perfected with genuine Cisco routers.

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0 ! 252 ip authentication mode eigrp 2 md5 ip authentication key−chain eigrp 2 router−b clockrate 64000 ! 5 configures Router A with a key chain value of router−a, a key value of 1, and a key−string value of eigrp. 6 configures Router B with a key chain value of router−b, a key value of 1, and a key−string value of eigrp. Notice again that the key chain need not match between routers; however, the key number and the key string associated with the key value must match between routers configured to use that key value.

4. 4: TACACS+ authentication. Note One other TACACS+ packet can be returned to the network access server from the security server. The ERROR packet is sent in the event of an error due to a failed daemon or network congestion problem during the authentication phase. If the network access server receives an ERROR packet from the security server, it will attempt to authenticate the client using the next configured method in the method list. TACACS+ Authorization Process Unlike the authentication process, the TACACS+ authorization process defines only two types of messages, REQUEST and RESPONSE.

An accounting record typically contains the following information: • Username • Network address • Service accessed • Start time, stop time, and date • Log origination date and time AAA Protocols Many protocols require authentication verification before providing authorization and access rights to the user or device. Each of the protocols that will be discussed in detail in the following sections is an example of such protocols. TACACS+ and RADIUS are the two predominant protocols implemented with security servers and used by networking devices.

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