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R1配置信息：
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip nat inside
no shutdown
interface Serial0/1/0
ip address 12.1.1.1 255.255.255.0
ip nat outside
no shutdown
ip nat inside source list 1 interface Serial0/1/0 overload
ip route 0.0.0.0 0.0.0.0 12.1.1.2
access-list 1 permit 192.168.1.0 0.0.0.255
------------------------------------------------------------------------------
R2配置信息：
interface Serial0/1/0
ip address 12.1.1.2 255.255.255.0
clock rate 64000
no shutdown
interface Serial0/2/0
ip address 23.1.1.2 255.255.255.0
clock rate 64000
no shutdown
------------------------------------------------------------------------------
R3配置信息：
aaa new-model
aaa authentication login ***-a local
aaa authorization network ***-n local
username cisco password 0 cisco123
crypto isakmp policy 10
hash md5
authentication pre-share
group 2
crypto isakmp client configuration group ***-group
key password123
pool ***pool
crypto ipsec transform-set test esp-3des esp-md5-hmac
crypto dynamic-map ***map 10
set transform-set test
reverse-route
crypto map map1 client authentication list ***-a
crypto map map1 isakmp authorization list ***-n
crypto map map1 client configuration address respond
crypto map map1 10 ipsec-isakmp dynamic ***map
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
no shutdown
interface Serial0/3/0
ip address 23.1.1.3 255.255.255.0
no shutdown
crypto map map1
ip local pool ***pool 172.16.0.100 172.16.0.200
ip route 0.0.0.0 0.0.0.0 23.1.1.2
----------------------------------------------------------------------------
實驗結果：
1、通過***軟件撥入訪問遠端服務器
2、已經成功通過***撥入到遠端內網並獲得IP地址
3、通過***撥入式成功訪問遠端內網服務器
-------------------------------------
最後說一句，使用Cisco Packet Tracer 5.3.2配置完成後可能出現客戶端***撥號不成功，需要保存配置後重新打開Packet Tracer保存文件再試一次，Cisco Packet Tracer實驗保存文件已上傳，但需要重命名文件爲pkt格式即可。