【正文】 設(shè)置電話號碼 dialer string dialstring 指定在特定線路下路由器默認 使用的chatscript script {dialer|reset} scriptname Router1: hostname Router1 ! enable secret 5 $1$QKI7$wXjpFqC74vDAyKBUMallw/ ! username Router2 password cisco chatscript ciscodefault AT TIMEOUT 30 OK ATDT \T TIMEOUT 30 CONNECT \c ! interface Ethernet0 ip address ! interface Async1 ip address encapsulation ppp async default routing async mode dedicated dialer inband dialer idletimeout 60 dialer map ip name Router2 modemscript ciscodefault 573 dialergroup 1 ppp authentication chap ! ip route dialerlist 1 protocol ip permit ! line con 0 line aux 0 modem InOut modem autoconfigure discovery flowcontrol hardware Router2: h。所建的這兩用戶的password必須相同。其中采用PPP/CHAP做安全認證，在Router1中應(yīng)建立一個用戶，以對端路由器主機名作為用戶名，即用戶名應(yīng)為Router2。 DDR（dialondemand routing）實例此例通過Cisco 2500系列路由器的aux端口實現(xiàn)異步撥號DDR連接。 tacacsserver key tac 訪問服務(wù)器設(shè)置如下：hostname router!aaa newmodelaaa authentication login default tacacs+aaa authentication login no_tacacs enableaaa authentication ppp default tacacs+aaa authorization exec tacacs+aaa authorization network tacacs+aaa accounting exec startstop tacacs+aaa accounting network startstop tacacs+enable secret 5 $1$kN4g$!interface Ethernet0 ip address !interface Serial0no ip addressshutdowninterface Serial1no ip addressshutdown!interface GroupAsync1ip unnumbered Ethernet0encapsulation pppasync mode interactivepeer default ip address pool Cisco2511Group142no cdp enablegrouprange 1 16!ip local pool Cisco2511Group142 tacacsserver host tacacsserver key tac!line con 0exectimeout 0 0password ciscologin authentication no_tacacs line 1 16login authentication tacacsmodem InOutmodem autoconfigure type usr_courierautomand ppptransport input allstopbits 1rxspeed 115200txspeed 115200flowcontrol hardwareline aux 0transport input allline vty 0 4password cisco!end2. aaa accounting network startstop tacacs+ 指定Tacacs服務(wù)器地址 tacacsserver host 在Tacacs+服務(wù)器和訪問服務(wù)器設(shè)定共享的關(guān)鍵字，訪問服務(wù)器和Tacacs+服務(wù)器使用這個關(guān)鍵字去加密口令和響應(yīng)信息。 aaa authorization network tacacs+ +服務(wù)器。 全局設(shè)置：任務(wù) 命令 設(shè)置用戶名和密碼 username username password password 設(shè)置用戶的IP地址池 ip local pool {default | poolname lowipaddress [highipaddress]} 指定地址池的工作方式 ip addresspool [dhcpproxyclient | local] 基本接口設(shè)置命令： 任務(wù) 命令 設(shè)置封裝形式為PPP encapsulation ppp 啟動異步口的路由功能 async default routing 設(shè)置異步口的PPP工作方式 async mode {dedicated | interactive} 設(shè)置用戶的IP地址 peer default ip address {ipaddress | dhcp | pool [poolname]} 設(shè)置IP地址與Ethernet0相同 ip unnumbered ethernet0 line撥號線設(shè)置： 任務(wù) 命令 設(shè)置modem的工作方式 modem {inout|dialin} 自動配置modem類型 modem autoconfig discovery 設(shè)置撥號線的通訊速率 speed speed 設(shè)置通訊線路的流控方式 flowcontrol {none | software [lock] [in | out] | hardware [in | out]} 連通后自動執(zhí)行命令 automand mand 訪問服務(wù)器設(shè)置如下：Router: hostname Router enable secret 5 $1$EFqU$tYLJLrynNUKzE4bx6fmH// ! interface Ethernet0 ip address ! interface Async1 ip unnumbered Ethernet0 encapsulation ppp keepalive 10 async mode interactive peer default ip address pool Cisco2511Group142 ! ip local pool Cisco2511Group142 ! line con 0exectimeout 0 0password cisco!line 1 16 modem InOut modem autoconfigure discovery flowcontrol hardware ! line aux 0transport input allline vty 0 4password cisco!end 遠程訪問1. set user remotenet 使用PPP/IPCP set ip framing none 設(shè)置上網(wǎng)用戶帳號 set ppp clientname 263 設(shè)置上網(wǎng)口令 set ppp password client Enter new Password: 263 ReType new Password: 263 不用PPP/CHAP或PAP做認證 set ppp authentication out none 允許地址磋商 set ppp address negotiation local on 設(shè)置地址翻譯 set ip pat on 設(shè)置默認路由 set ip route destination 設(shè)置ISP的電話號碼 set number 2633 激活用戶預(yù)制文件 set active 　六、PSTN　　電話網(wǎng)絡(luò)(PSTN)是目前普及程度最高、成本最低的公用通訊網(wǎng)絡(luò)，它在網(wǎng)絡(luò)互連中也有廣泛的應(yīng)用。 ISDN訪問首都在線263網(wǎng)實例: ,屬于保留地址，通過NAT地址翻譯功能，局域網(wǎng)用戶可以通過ISDN上263網(wǎng)訪問Internet。 router1 00:03:50: %LINK3UPDOWN: Interface BRI0:1, changed state to up 00:03:50: BRI0:1:PPP callback Callback server starting to router2 572 00:03:50: BRI0:1: disconnecting call 00:03:50: %LINK3UPDOWN: Interface BRI0:1, changed state to down 00:03:50: BRI0:1: disconnecting call 00:03:50: BRI0:1: disconnecting call 00:03:51: %LINK3UPDOWN: Interface BRI0:2, changed state to up 00:03:52: callback to router2 already started 00:03:52: BRI0:2: disconnecting call 00:03:52: %LINK3UPDOWN: Interface BRI0:2, changed state to down 00:03:52: BRI0:2: disconnecting call 00:03:52: BRI0:2: disconnecting call 00:04:05: : Callback timer expired 00:04:05: BRI0:beginning callback to router2 572 00:04:05: BRI0: Attempting to dial 572 00:04:05: Freeing callback to router2 572 00:04:05: %LINK3UPDOWN: Interface BRI0:1, changed state to up 00:04:05: BRI0:1: No callback negotiated 00:04:05: %LINK3UPDOWN: Interface VirtualAccess1, changed state to up 00:04:05: dialer Protocol up for Vi1 00:04:06: %LINEPROTO5UPDOWN: Line protocol on Interface BRI0:1, changed state to up 00:04:06: %LINEPROTO5UPDOWN: Line protocol on Interface VirtualAccess1, chang ed state to up 00:04:11: %ISDN6CONNECT: Interface BRI0:1 is now connected to 572 router1 4. dialer map protocol address name hostname class classname dialstring 設(shè)置接口支持PPP回撥 ppp callback accept 在全局模式下為PPP回撥設(shè)置映射類別 mapclass dialer classname 通過查找注冊在dialer map里的主機名來決定回撥. dialer callbackserver [username] 設(shè)置接口要求PPP回撥 ppp callback request 設(shè)置如下：Router1:hostname router1 user router2 password cisco ! isdn switchtype basicnet3 ! interface bri 0 ip address encapsulation ppp dialer map ip name router2 class s3 572 dialer loadthreshold 8