在专用网络之间配置 IPSec 路由器到路由器、预共享和 NAT 过载
简介
本示例配置显示如何使用 IPSec 在二个专用网络（10.50.50.x 和 10.103.1.x）之间加密数据流。网络根据它们的专用地址来相互辨认。
先决条件
要求
本文档没有任何特定的要求。
使用的组件
本文档中的信息基于以下软件和硬件版本：
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Cisco IOS® 软件版本12.3.1a
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Cisco 2691 路由器
本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您使用的是真实网络，请确保您已经了解所有命令的潜在影响。
规则
有关文档规则的详细信息，请参阅 Cisco 技术提示规则。
配置
本部分提供有关如何配置本文档所述功能的信息。
注：要查找有关本文档中使用的命令的其他信息，请使用命令查找工具(仅注册客户)。
网络图
本文档使用此图所示的网络设置。
配置
本文档使用以下配置。
| Router A |
|---|
Router_A#write terminal Building configuration... Current configuration : 1638 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router_A ! boot system flash:c2691-ik9o3s-mz.123-1a.bin ! ip subnet-zero ! ip audit notify log ip audit po max-events 100 no ftp-server write-enable ! crypto isakmp policy 1 hash md5 authentication pre-share crypto isakmp key cisco123 address 95.95.95.2 ! crypto ipsec transform-set rtpset esp-des esp-md5-hmac ! crypto map rtp 1 ipsec-isakmp set peer 95.95.95.2 set transform-set rtpset !--- Include the private network to private network traffic !--- in the encryption process. match address 115 ! no voice hpi capture buffer no voice hpi capture destination ! interface FastEthernet0/0 ip address 99.99.99.2 255.255.255.0 ip nat outside duplex auto speed auto crypto map rtp ! interface FastEthernet0/1 ip address 10.50.50.50 255.255.255.0 ip nat inside duplex auto speed auto ! !--- Except the private network traffic from the !--- Network Address Translation (NAT) process. ip nat inside source route-map nonat interface FastEthernet0/0 overload ip http server no ip http secure-server ip classless ip route 0.0.0.0 0.0.0.0 99.99.99.1 ! !--- Except the private network traffic from the NAT process. access-list 110 deny ip 10.50.50.0 0.0.0.255 10.103.1.0 0.0.0.255 access-list 110 permit ip 10.50.50.0 0.0.0.255 any !--- Include the private network to private network traffic !--- in the encryption process. access-list 115 permit ip 10.50.50.0 0.0.0.255 10.103.1.0 0.0.0.255 ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! dial-peer cor custom ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! end Router_A# |
| Router B |
|---|
Router_B#write terminal Building configuration... Current configuration : 1394 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router_B ! boot system flash:c2691-ik9o3s-mz.123-1a.bin ! ip subnet-zero ! ip audit notify log ip audit po max-events 100 no ftp-server write-enable ! crypto isakmp policy 1 hash md5 authentication pre-share crypto isakmp key cisco123 address 99.99.99.2 ! crypto ipsec transform-set rtpset esp-des esp-md5-hmac ! crypto map rtp 1 ipsec-isakmp set peer 99.99.99.2 set transform-set rtpset !--- Include the private network to private network traffic !--- in the encryption process. match address 115 ! no voice hpi capture buffer no voice hpi capture destination ! interface FastEthernet0/0 ip address 95.95.95.2 255.255.255.0 ip nat outside duplex auto speed auto crypto map rtp ! interface FastEthernet0/1 ip address 10.103.1.75 255.255.255.0 ip nat inside duplex auto speed auto ! !--- Except the private network traffic from the NAT process. ip nat inside source route-map nonat interface FastEthernet0/0 overload ip http server no ip http secure-server ip classless ip route 0.0.0.0 0.0.0.0 95.95.95.1 ! !--- Except the private network traffic from the NAT process. access-list 110 deny ip 10.103.1.0 0.0.0.255 10.50.50.0 0.0.0.255 access-list 110 permit ip 10.103.1.0 0.0.0.255 any !--- Include the private network to private network traffic !--- in the encryption process. access-list 115 permit ip 10.103.1.0 0.0.0.255 10.50.50.0 0.0.0.255 ! !--- Except the private network traffic from the NAT process. route-map nonat permit 10 match ip address 110 ! dial-peer cor custom ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! end Router_B# |
验证
当前没有可用于此配置的验证过程。
故障排除
故障排除命令
命令输出解释程序工具（仅限注册用户）支持某些 show 命令，使用此工具可以查看对 show 命令输出的分析。
注意：在发出debug命令之前，请参阅有关Debug命令的重要信息。
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debug crypto ipsec sa — 显示阶段 2 的 IPSec 协商。
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debug crypto isakmp sa - 显示第 1 阶段的 Internet 安全连接和密钥管理协议 (ISAKMP) 协商。
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debug crypto engine — 显示加密会话。
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