----参照以前的博文：http://333234.blog.51cto.com/323234/1253465
A.基本配置：
①FW1：
----接口配置：
interface Ethernet0
nameif Inside
security-level 100
ip address 192.168.1.1 255.255.255.0
no shut
interface Ethernet1
nameif Outside
security-level 0
ip address 202.100.1.1 255.255.255.0
no shut
----路由配置：
route Outside 0.0.0.0 0.0.0.0 202.100.1.10
----策略配置:
access-list OUTSIDE extended permit icmp any any
access-group OUTSIDE in interface Outside
----PAT配置：
access-list PAT extended permit ip 192.168.0.0 255.255.0.0 any
access-list NONAT extended permit ip 192.168.0.0 255.255.0.0 172.16.0.0 255.255.0.0
global (Outside) 1 interface
nat (Inside) 0 access-list NONAT
nat (Inside) 1 access-list PAT
②FW2：
----接口配置：
interface Ethernet0
nameif Inside
security-level 100
ip address 172.16.1.1 255.255.255.0
no shut
interface Ethernet1
nameif Outside
security-level 0
ip address 202.100.2.1 255.255.255.0
no shut
----路由配置：
route Outside 0.0.0.0 0.0.0.0 202.100.2.10
----策略配置:
access-list OUTSIDE extended permit icmp any any
access-group OUTSIDE in interface Outside
----PAT配置：
access-list PAT extended permit ip 172.16.0.0 255.255.0.0 any
access-list NONAT extended permit ip 172.16.0.0 255.255.0.0 192.168.0.0 255.255.0.0
global (Outside) 1 interface
nat (Inside) 0 access-list NONAT
nat (Inside) 1 access-list PAT
B.×××配置：
①FW1:
----第一阶段策略：
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash md5
group 2
tunnel-group 202.100.2.1 type ipsec-l2l
tunnel-group 202.100.2.1 ipsec-attributes
pre-shared-key cisco
----第二阶段转换集：
crypto ipsec transform-set transet esp-des esp-md5-hmac
----感兴趣流：
access-list ××× extended permit ip 192.168.0.0 255.255.0.0 172.16.0.0 255.255.0.0
④配置crypto map并应用、在接口开启isakmp：
crypto map crymap 20 match address ×××
crypto map crymap 20 set peer 202.100.2.1
crypto map crymap 20 set transform-set transet
crypto map crymap interface Outside
crypto isakmp enable Outside
①FW2：
----第一阶段策略：
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash md5
group 2
tunnel-group 202.100.1.1 type ipsec-l2l
tunnel-group 202.100.1.1 ipsec-attributes
pre-shared-key cisco
----第二阶段转换集：
crypto ipsec transform-set transet esp-des esp-md5-hmac
----感兴趣流：
access-list ××× extended permit ip 172.16.0.0 255.255.0.0 192.168.0.0 255.255.0.0
④配置crypto map并应用、在接口开启isakmp：
crypto map crymap 20 match address ×××
crypto map crymap 20 set peer 202.100.1.1
crypto map crymap 20 set transform-set transet
crypto map crymap interface Outside
crypto isakmp enable Outside
C.测试：
①不用触发×××,查看防火墙的outside接口路由，可以看到只有一条默认路由
----因为没有配置反向路由注入
FW1(config)# show route outside
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 202.100.1.10 to network 0.0.0.0
C 202.100.1.0 255.255.255.0 is directly connected, Outside
S* 0.0.0.0 0.0.0.0 [1/0] via 202.100.1.10, Outside
FW1(config)#
②增加反向路由注入配置，也不用触发×××,可以看到outside多一条静态路由
FW1(config)# crypto map crymap 20 set reverse-route
FW1(config)# show route outside
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 202.100.1.10 to network 0.0.0.0
S 172.16.0.0 255.255.0.0 [1/0] via 202.100.1.10, Outside
C 202.100.1.0 255.255.255.0 is directly connected, Outside
S* 0.0.0.0 0.0.0.0 [1/0] via 202.100.1.10, Outside
③修改感兴趣流的ACL,静态路由也跟着变化
FW1(config)# access-list ××× extended permit ip 192.168.1.0 255.255.255.0 172.16.1.0 255.255.255.0
FW1(config)# show route outside
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 202.100.1.10 to network 0.0.0.0
S 172.16.0.0 255.255.0.0 [1/0] via 202.100.1.10, Outside
S 172.16.1.0 255.255.255.0 [1/0] via 202.100.1.10, Outside
C 202.100.1.0 255.255.255.0 is directly connected, Outside
S* 0.0.0.0 0.0.0.0 [1/0] via 202.100.1.10, Outside
----原有的感兴趣流没有删除，只是增加了一条更详细的ACL，静态路由也增加了一条更详细的路由
----由此可见，反向路由注入的条目只是的感兴趣流的目标网络有关，并且与是否触发×××也没有关系