通过模拟MODEM拨号连接，实现两个LAN的互连。
router a------68001001------PSTN-------68001002------router b
A和B都采用cisco2621XM路由器，配置WIC-2A/S接口卡，通过PSTN互连
WIC-AM模块和WIC-A/S模块的区别在于AM已经内置MODEM，而A/S需要外接MODEM
//ROUTER A
username routerb pass cisco
chat-script default ABORT ERROR ABORT BUSY ABORT "NO ANSWER" "" "ATDT\T" TIMEOUT 60 CONNECT \c
modemcap entry default:FD=&F:AA=S0=1:CD=$C1:DTR=&D3:NEC=E0:NRS=Q1
int dialer1
description connected to router b
ip unnumbered fa0/0
encap ppp
dialer in-band
dialer idle-timeout 120
dialer hold-queue 10
dialer map snapshot 1 name routerb broadcast
dialer map ip 192.168.11.254 name routerb modem-script default broadcast 68001002
dialer-group 1
pulse-time 3
ppp auth chap
snapshot server 15 dialer
no cdp enable
int fa0/0
description connected to lan a
ip addr 192.168.10.254 255.255.255.0
int s0/0
physical-layer async
description connected to router b
no ip addr
async mode dedicated
dialer rotary-group 1
dialer-list 1 protocol ip permit
router rip
ver 2
netw 192.168.10.0
no auto-summary
line 1
modem inout
modem autoconfig type default
transport input all //?
stopbits 1
speed 38400
flowcontrol hardware
//router b
username routera pass cisco
chat-script default ABORT ERROR ABORT BUSY ABORT "NO ANSWER"
"" "ATDT\T" TIMEOUT 60 CONNECT \c
modemcap entry default:FD=&F:AA=S0=1:CD=&C1:DTR=&D3:NEC=E0:NRS=Q1
int dialer 1
description connected to router a
ip unnumbered fa0/0
encap ppp
dialer in-band
dialer idle-timeout 120
dialer hold-queue 10
dialer map snapshot 1 name routera modem-script default broadcast 68001001
dialer map ip 192.168.10.254 name routera modem-script default broadcast 8001001
dialer-group 1
pulse-time 3
ppp auth chap
snapshot client 15 360 suppress-statechange-update dialer
no cdp enable
int fa0/0
description connected to lan b
ip addr 192.168.11.254 255.255.255.0
int s0/0
physical-layer async //?
description connected to router a
no ip addr
async mode dedicated
dialer rotary-group 1
dialer-list 1 protocol ip permit
router rip
ver 2
netw 192.168.11.0
no auto-summary
line 1
modem inout
modem autoconfig type default
transport input all //?
stopbits 1
speed 38400
flowcontrol hardware
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