PIX 6.x：使用NAT在静态寻址的IOS路由器和动态寻址的PIX防火墙之间配置动态IPsec的配置示例

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已更新: 2018 年 9 月 20 日

文档 ID:66173

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简介

本文档提供了一个示例配置，说明如何启用IOS^®路由器以接受来自PIX防火墙的动态IPsec连接。如果专用网络 10.0.0.x 访问 Internet，则远程路由器会执行网络地址转换 (NAT)。NAT 进程中不包括从 10.0.0.x 到 PIX 之后专用网络 10.1.0.x 的数据流。PIX 防火墙可以发起与路由器的连接，但路由器无法发起与 PIX 的连接。

此配置使用 Cisco IOS 路由器以创建与 PIX 防火墙之间的动态 IPsec LAN 到 LAN (L2L) 隧道，这些隧道在其公共接口（外部接口）上接收动态 IP 地址。动态主机配置协议 (DHCP) 提供一种从 Internet 服务提供商 (ISP) 动态分配 IP 地址的机制。这样，当主机不再需要这些 IP 地址时，就可以重用它们。

有关PIX接受来自路由器的动态IPsec连接的方案的详细信息，请参阅使用NAT在静态寻址的PIX防火墙和动态寻址的IOS路由器之间配置动态IPsec的配置示例。

要启用PIX/ASA安全设备，接受来自IOS路由器的动态IPsec连接，请参阅PIX/ASA 7.x及更高版本：使用NAT在静态寻址的PIX和动态寻址的IOS路由器之间配置动态IPsec的配置示例。

要了解有关PIX/ASA安全设备运行软件版本7.x及更高版本的同一方案的详细信息，请参阅PIX/ASA 7.x及更高版本：使用NAT在静态寻址的IOS路由器和动态寻址的PIX之间配置动态IPsec的示例。

Cisco IOS®软件版本12.4
Cisco PIX 防火墙软件 6.3.4 版
Cisco Secure PIX 防火墙 515E
Cisco 2811 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。

PIX 515E
R2（Cisco 2811 路由器）

PIX 515E
PIX Version 6.3(4) interface ethernet0 100full interface ethernet1 100full interface ethernet2 shut nameif ethernet0 outside security0 nameif ethernet1 inside security100 nameif ethernet2 intf2 security4 enable password 8Ry2YjIyt7RRXU24 encrypted passwd 2KFQnbNIdI.2KYOU encrypted hostname PIX515E fixup protocol dns maximum-length 512 fixup protocol ftp 21 fixup protocol h323 h225 1720 fixup protocol h323 ras 1718-1719 fixup protocol http 80 fixup protocol rsh 514 fixup protocol rtsp 554 fixup protocol sip 5060 fixup protocol sip udp 5060 fixup protocol skinny 2000 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol tftp 69 names !--- The access control list (ACL) to avoid NAT on the IPsec packets. access-list NO-NAT permit ip 10.1.0.0 255.255.255.0 10.0.0.0 255.255.255.0 !--- The ACL to apply on crypto map. !--- Include the private-network-to-private-network traffic !--- in the encryption process. access-list 101 permit ip 10.1.0.0 255.255.255.0 10.0.0.0 255.255.255.0 pager lines 24 logging on mtu outside 1500 mtu inside 1500 mtu intf2 1500 !--- ISP will providthe the Outside IP address. ip address outside dhcp ip address inside 10.1.0.3 255.255.255.0 ip audit info action alarm ip audit attack action alarm no failover failover timeout 0:00:00 failover poll 15 no failover ip address outside no failover ip address inside no failover ip address intf2 pdm history enable arp timeout 14400 global (outside) 1 interface nat (inside) 0 access-list NO-NAT nat (inside) 1 0.0.0.0 0.0.0.0 0 0 route outside 10.0.0.0 255.255.255.0 172.16.1.5 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00 timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00 timeout uauth 0:05:00 absolute aaa-server TACACS+ protocol tacacs+ aaa-server TACACS+ max-failed-attempts 3 aaa-server TACACS+ deadtime 10 aaa-server RADIUS protocol radius aaa-server RADIUS max-failed-attempts 3 aaa-server RADIUS deadtime 10 aaa-server LOCAL protocol local no snmp-server location no snmp-server contact snmp-server community public no snmp-server enable traps floodguard enable sysopt connection permit-ipsec !--- IPsec configuration, Phase 2. crypto ipsec transform-set DYN-TS esp-des esp-md5-hmac crypto map IPSEC 10 ipsec-isakmp crypto map IPSEC 10 match address 101 crypto map IPSEC 10 set peer 10.95.49.1 crypto map IPSEC 10 set transform-set DYN-TS crypto map IPSEC interface outside !--- Internet Security Association and Key Management Protocol (ISAKMP) !--- policy, Phase 1. !--- Note:* In real show run output, the pre-shared key appears as ******. isakmp enable outside isakmp key cisco123 address 10.95.49.1 netmask 255.255.255.255 isakmp policy 10 authentication pre-share isakmp policy 10 encryption des isakmp policy 10 hash md5 isakmp policy 10 group 1 isakmp policy 10 lifetime 86400 telnet timeout 5 ssh timeout 5 console timeout 0 terminal width 80 Cryptochecksum:f0294298e214a947fc2e03f173e4a405 : end

PIX 515E

PIX Version 6.3(4)
interface ethernet0 100full
interface ethernet1 100full
interface ethernet2 shut
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 intf2 security4
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname PIX515E
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names


!--- The access control list (ACL) to avoid NAT on the IPsec packets.

access-list NO-NAT permit ip 10.1.0.0 255.255.255.0 10.0.0.0 255.255.255.0 

!--- The ACL to apply on crypto map. !--- Include the private-network-to-private-network traffic !--- in the encryption process.

access-list 101 permit ip 10.1.0.0 255.255.255.0 10.0.0.0 255.255.255.0 
pager lines 24
logging on
mtu outside 1500
mtu inside 1500
mtu intf2 1500

!--- ISP will providthe the Outside IP address.


ip address outside dhcp

ip address inside 10.1.0.3 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
no failover
failover timeout 0:00:00
failover poll 15
no failover ip address outside
no failover ip address inside
no failover ip address intf2
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list NO-NAT
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
route outside 10.0.0.0 255.255.255.0 172.16.1.5 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+ 
aaa-server TACACS+ max-failed-attempts 3 
aaa-server TACACS+ deadtime 10 
aaa-server RADIUS protocol radius 
aaa-server RADIUS max-failed-attempts 3 
aaa-server RADIUS deadtime 10 
aaa-server LOCAL protocol local 
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec


!--- IPsec configuration, Phase 2.

crypto ipsec transform-set DYN-TS esp-des esp-md5-hmac 
crypto map IPSEC 10 ipsec-isakmp
crypto map IPSEC 10 match address 101
crypto map IPSEC 10 set peer 10.95.49.1
crypto map IPSEC 10 set transform-set DYN-TS
crypto map IPSEC interface outside

!--- Internet Security Association and Key Management Protocol (ISAKMP) !--- policy, Phase 1. !--- Note: In real show run output, the pre-shared key appears as *******.

isakmp enable outside
isakmp key cisco123 address 10.95.49.1 netmask 255.255.255.255 
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption des
isakmp policy 10 hash md5
isakmp policy 10 group 1
isakmp policy 10 lifetime 86400

telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80
Cryptochecksum:f0294298e214a947fc2e03f173e4a405
: end

R2（Cisco 2811 路由器）
R2#show running-configuration Building configuration... Current configuration : 1916 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname r1800 ! boot-start-marker boot-end-marker ! ! no aaa new-model ! resource policy ! mmi polling-interval 60 no mmi auto-configure no mmi pvc mmi snmp-timeout 180 ip subnet-zero ip cef ! ! no ip dhcp use vrf connected ! ! no ip ips deny-action ips-interface ! no ftp-server write-enable ! ! !--- ISAKMP policy, Phase 1. crypto isakmp policy 10 hash md5 authentication pre-share crypto isakmp key 6 cisco123 address 0.0.0.0 0.0.0.0 ! ! !--- IPsec policy, Phase 2. crypto ipsec transform-set DYN-TS esp-des esp-md5-hmac ! crypto dynamic-map DYN 10 set transform-set DYN-TS match address 101 ! ! crypto map IPSEC 10 ipsec-isakmp dynamic DYN ! ! ! interface FastEthernet0/0 ip address 10.95.49.1 255.255.255.0 ip nat outside ip virtual-reassembly load-interval 30 duplex auto speed auto crypto map IPSEC ! interface FastEthernet0/1 ip address 10.0.0.1 255.255.255.0 ip nat inside ip virtual-reassembly duplex auto speed auto ! ip classless ip route 10.1.0.0 255.255.255.0 10.95.49.2 ! ip http server no ip http secure-server !--- Except the private network from the NAT process. ip nat inside source list 102 interface FastEthernet0/0 overload ! !--- Include the private-network-to-private-network !--- traffic in the encryption process. access-list 101 permit ip 10.0.0.0 0.0.0.255 10.1.0.0 0.0.0.255 !--- Except the private network from the NAT process. access-list 102 deny ip 10.0.0.0 0.0.0.255 10.1.0.0 0.0.0.255 access-list 102 permit ip 10.0.0.0 0.0.0.255 any ! ! control-plane ! ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 exec-timeout 0 0 login ! end

R2（Cisco 2811 路由器）

R2#show running-configuration
Building configuration...

Current configuration : 1916 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname r1800
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
resource policy
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
ip cef 
!
!
no ip dhcp use vrf connected
!
!
no ip ips deny-action ips-interface
!
no ftp-server write-enable
!
! 

!--- ISAKMP policy, Phase 1.

crypto isakmp policy 10
hash md5
authentication pre-share
crypto isakmp key 6 cisco123 address 0.0.0.0 0.0.0.0
!
!

!--- IPsec policy, Phase 2.

crypto ipsec transform-set DYN-TS esp-des esp-md5-hmac 
!
crypto dynamic-map DYN 10
set transform-set DYN-TS 
match address 101
!
!
crypto map IPSEC 10 ipsec-isakmp dynamic DYN 
!
!
!
interface FastEthernet0/0
ip address 10.95.49.1 255.255.255.0
ip nat outside
ip virtual-reassembly
load-interval 30
duplex auto
speed auto
crypto map IPSEC
!
interface FastEthernet0/1
ip address 10.0.0.1 255.255.255.0
ip nat inside
ip virtual-reassembly
duplex auto
speed auto
!
ip classless
ip route 10.1.0.0 255.255.255.0 10.95.49.2
!
ip http server
no ip http secure-server

!--- Except the private network from the NAT process.

ip nat inside source list 102 interface FastEthernet0/0 overload
!

!--- Include the private-network-to-private-network !--- traffic in the encryption process.

access-list 101 permit ip 10.0.0.0 0.0.0.255 10.1.0.0 0.0.0.255


!--- Except the private network from the NAT process.

access-list 102 deny ip 10.0.0.0 0.0.0.255 10.1.0.0 0.0.0.255
access-list 102 permit ip 10.0.0.0 0.0.0.255 any
!
!
control-plane
!
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
exec-timeout 0 0
login 
!
end