CCIE-12-IPSec-VPN-RemoteAccess

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实验条件

网络拓朴

在这里插入图片描述

实验目的

为R2和R3建立IPSec VPN
R4可以ping通R5

开始配置

R2：模拟需要远程访问网络的网关
R4：模拟需要远程访问网络内的目标主机
R3：本地网络上网的网关
R5：移动办公用户，需要去访问远程网络的个人设备

1. R2 Ping R3确定基础网络是通的

R2#show ip int br
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                192.168.1.254   YES TFTP   up                    up      
Ethernet0/1                12.1.1.2        YES TFTP   up                    up      
Ethernet0/2                unassigned      YES TFTP   administratively down down    
Ethernet0/3                unassigned      YES TFTP   administratively down down    
NVI0                       192.168.1.254   YES unset  up                    up      
R2#ping 13.1.1.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 13.1.1.3, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/1 ms
R2#ping 192.168.2.254
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.254, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)

2. 配置R2

第一阶段：协商秘钥参数

R2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R2(config)#crypto isakmp policy 10
R2(config-isakmp)#encryption aes 256
R2(config-isakmp)#hash sha256
R2(config-isakmp)#authentication pre-share
R2(config-isakmp)#group 5
R2(config-isakmp)#lifetime 3600

第一阶段：配置预共享秘钥用于身份认证，由于R3是模拟任意公网路由器，其公网IP应该在现实中不知道的，所以这里的对端peer address为0.0.0.0，表示任意

R2(config-isakmp)#crypto isakmp key CISCO address 0.0.0.0

第二阶段：配置IPsec转换集

R2(config)#crypto ipsec transform-set mySET esp-aes 256 esp-sha256-hmac
R2(cfg-crypto-trans)#mode tunnel                                       
R2(cfg-crypto-trans)#exit

配置dynamic crypto map：由于R2作为目标网络出口网关，其IP地址固定；但是
移动办公用户接入的出口路由器是任意的（这里是R3），所以无法指对端peer具体地址，同时也没有办法做到主动去匹配感兴趣流，只能被动响应

R2(config)#crypto dynamic-map MOBILE_USER 10
R2(config-crypto-map)#set transform-set mySET
R2(config-crypto-map)#exit

将动态crypto map与静态crypto map做关联：因为dynamic crypto map 无法直接在接口下调用，只能关联后通过调用静态crypto map来间接关联动态的crypto map

R2(config)#crypto map myMAP 10 ipsec-isakmp dynamic MOBILE_USER
R2(config)#interface e0/1 
R2(config-if)#crypto map myMAP

3. 配置R5

R5#CONF T     
Enter configuration commands, one per line.  End with CNTL/Z.
R5(config)#crypto isakmp policy 10
R5(config-isakmp)# encr aes 256
R5(config-isakmp)# hash sha256
R5(config-isakmp)# authentication pre-share
R5(config-isakmp)# group 5
R5(config-isakmp)# lifetime 3600

这里要指目标网络出口网关的地址

R5(config-isakmp)#crypto isakmp key CISCO address 12.1.1.2

第二阶段：转换集设置

R5(config)#crypto ipsec transform-set mySET esp-aes 256 esp-sha256-hmac 
R5(cfg-crypto-trans)# mode tunnel
R5(cfg-crypto-trans)# exit

crypto map映射

R5(config)#crypto map myMAP 10 ipsec-isakmp 
% NOTE: This new crypto map will remain disabled until a peerand a valid access list have been configured.
R5(config-crypto-map)# set peer 12.1.1.2
R5(config-crypto-map)# match address 101
// 要配置转换集。不然会导致无法协商成功
R5(config-crypto-map)# set transform-set mySET
R5(config-crypto-map)# exit

定义感兴趣流量

R5(config)# access-list 101 permit ip 192.168.2.0 0.0.0.255 192.168.1.0 0.0.0.255

R5-e0/0接口下调用

R5(config)# interface Ethernet0/0
R5(config-if)# crypto map myMAP

3. 验证

R2#show crypto session
Crypto session current statusInterface: Ethernet0/1
Session status: UP-ACTIVE     
Peer: 13.1.1.3 port 4500 Session ID: 0  IKEv1 SA: local 12.1.1.2/4500 remote 13.1.1.3/4500 Active IPSEC FLOW: permit ip 192.168.1.0/255.255.255.0 192.168.2.0/255.255.255.0 Active SAs: 2, origin: dynamic crypto mapR2#

R5#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 5/5/6 ms
R5#show crypto session
Crypto session current statusInterface: Ethernet0/0
Session status: UP-ACTIVE     
Peer: 12.1.1.2 port 4500 Session ID: 0  IKEv1 SA: local 192.168.2.1/4500 remote 12.1.1.2/4500 Active IPSEC FLOW: permit ip 192.168.2.0/255.255.255.0 192.168.1.0/255.255.255.0 Active SAs: 2, origin: crypto map

R4#ping 192.168.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms
R4#