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Module 2: Modems and Asynchronous Dialup Connections
 
2.2.3 Configuring reverse telnet

Router#telnet host [ port] [keyword]
Router# disconnect [connection]

 

2.2.4 Asynchronous Interfaces and line configuration

Router(config-if)#physical-layer {sync | async}
Router(config)#async mode dedicated
Router(config-if)# encapsulation encapsulation-type
Router(config)#line [aux | console | tty | vty] line number [ending-line-number]
Router(config-line)#login [local | tacacs]
Router(config-line)#speed bps
Router(config-line)#flowcontrol {none | software [lock] [in | out] | hardware [in | out]}
Router(config-line)#transport input {all | lat | mop | nasi | none | pad | rlogin | telnet | v120}
Router(config-line)# stopbits {1 | 1.5 | 2}

Command to verify line configuration
Router#show line [line-number]

 

2.2.11 Introduction to DDR – dialer list

Router(config)#dialer-list dialer-group protocol protocol-name {permit | deny | list access-list-number | access-group}
Router(config-if)#dialer in-band [no-parity | odd-parity]

Dialer Parameters
Router(config-if)#dialer idle-timeout seconds
Router(config-if)#dialer wait-for-carrier-time seconds
Router(config-if)#dialer hold-queue packets
Router(config-if)#dialer-group group-number
Router(config-if)#dialer map protocol next-hop-address [name hostname] [spc] [speed 56 | 64] [broadcast] [modem-script modem-regexp] [system-script system-regexp][dial-string[:isdn-subaddress]]
Router(config)# map-class dialer classname

Commans to verify dial on demand configuration
Router# show dialer [interface type number]
Router#debug dialer

 

2.3.7 Modem autodiscovery

Router(config)#modem autoconfigure discovery

Monitoring Modem Configuration 
Router#debug confmodem
 

2.3.10 Chat scripts for async lines

Router(config)#chat-script script-name expect-send
 

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