一.测试拓扑
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二.配置步骤
1.基本配置
A.PC1:
interface Loopback0
ip address 1.1.1.1 255.255.255.0
interface Ethernet0/0
ip address 10.1.1.10 255.255.255.0
no shutdown
ip route 2.2.2.0 255.255.255.0 10.1.1.1
B.Site1:
interface GigabitEthernet0/0
nameif Inside
security-level 100
ip address 10.1.1.1 255.255.255.0
no shutdown
interface GigabitEthernet0/1
nameif Outside
security-level 0
ip address 202.100.1.1 255.255.255.0
no shutdown
route Outside 2.2.2.0 255.255.255.0 202.100.1.10
route Outside 61.128.1.1 255.255.255.255 202.100.1.10
route Inside 0.0.0.0 0.0.0.0 10.1.1.10 tunneled
C.Internet:
interface Ethernet0/0
ip address 202.100.1.10 255.255.255.0
no shutdown
interface Ethernet0/1
ip address 61.128.1.10 255.255.255.0
no shutdown
D.Site2:
interface Loopback0
ip address 2.2.2.2 255.255.255.0
interface Ethernet0/0
ip address 61.128.1.1 255.255.255.0
no shutdown
ip route 202.100.1.1 255.255.255.255 61.128.1.10
ip route 1.1.1.0 255.255.255.0 61.128.1.10
2.VPN配置
A.Site1:
第一阶段策略:
crypto ikev1 policy 10
authentication pre-share
encryption 3des
hash md5
group 2
tunnel-group 61.128.1.1 type ipsec-l2l
tunnel-group 61.128.1.1 ipsec-attributes
ikev1 pre-shared-key 0 Cisc0123
第二阶段转换集：
crypto ipsec ikev1 transform-set transet esp-3des esp-md5-hmac
配置感兴趣流：
access-list VPN extended permit ip 1.1.1.0 255.255.255.0 2.2.2.0 255.255.255.0
配置crypto map并在接口应用：
crypto map crymap 10 match address VPN
crypto map crymap 10 set peer 61.128.1.1
crypto map crymap 10 set ikev1 transform-set transet
crypto map crymap 10 set pfs group2
crypto map crymap interface Outside
备注：这个地方接口名称区分大小写，另外如果一端配置pfs，另一端不配置，
路由器debug crypto isakmp error会由如下报错：
*Dec 24 03:30:33.545: ISAKMP:(1008): IPSec policy invalidated proposal with error 1024
*Dec 24 03:30:33.545: ISAKMP:(1008): phase 2 SA policy not acceptable! (local 61.128.1.1 remote 202.100.1.1)
*Dec 24 03:30:33.545: ISAKMP:(1008):deleting node 287875568 error TRUE reason "QM rejected"
ASA防火墙debug crypto ikev1会由如下报错：
Dec 24 03:50:35 [IKEv1]Group = 61.128.1.1, IP = 61.128.1.1, QM FSM error (P2 struct &0x00007fd87dae2070, mess id 0x4460326d)!
Dec 24 03:50:35 [IKEv1]Group = 61.128.1.1, IP = 61.128.1.1, Removing peer from correlator table failed, no match!
Dec 24 03:50:35 [IKEv1]Group = 61.128.1.1, IP = 61.128.1.1, Session is being torn down. Reason: Phase 2 Mismatch
在Outside接口激活ikev1：
crypto ikev1 enable Outside
B.Site2:
第一阶段策略:
crypto isakmp policy 10
encr 3des
hash md5
authentication pre-share
group 2
crypto isakm key 0 Cisc0123 address 202.100.1.1
第二阶段转换集：
crypto ipsec transform-set transet esp-3des esp-md5-hmac
mode tunnel
配置感兴趣流：
ip access-list extended VPN
permit ip 2.2.2.0 0.0.0.255 1.1.1.0 0.0.0.255
配置crypto map并在接口应用：
crypto map crymap 10 ipsec-isakmp
set peer 202.100.1.1
set transform-set transet
set pfs group2
match address VPN
interface Ethernet0/0
crypto map crymap
三.验证
1.通过PC1能ping通对端身后网络地址
PC1#ping 2.2.2.2 source 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
Packet sent with a source address of 1.1.1.1
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 2/2/4 ms
PC1#
2.防火墙查看安全关联
Site1# show crypto ikev1 sa
IKEv1 SAs:
Active SA: 1
Rekey SA: 0 (A tunnel will report 1 Active and 1 Rekey SA during rekey)
Total IKE SA: 1
1 IKE Peer: 61.128.1.1
Type : L2L Role : initiator
Rekey : no State : MM_ACTIVE
Site1#
