配置 Cisco 827 上带VPN IPSec NAT 超载的PPPoE

简介

Cisco 827 路由器通常是 DSL 客户端前置设备 (CPE)。 在此示例配置中，思科827配置用于以太网点对点协议(PPPoE的)，用作使用思科3600路由器的LAN-to-LAN IPSec隧道中的对端。Cisco 827 还会执行网络地址转换 (NAT) 过载以便为其内部网络提供 Internet 连接。

开始使用前 

规则

有关文档规则的详细信息，请参阅 Cisco 技术提示规则。

先决条件

当考虑此配置时，请牢记下列各项。

• 在Cisco 827中添加IPSec VPN配置之前，请确保PPPoE工作正常。要调试Cisco 827上的PPPoE客户端，必须考虑协议栈。应按以下顺序排除故障。

  1. DSL 物理层

  2. ATM 层

  3. 以太网层

  4. PPP 层

• 在此示例配置中，Cisco 827 具有一个静态 IP 地址。如果您的 Cisco 827 具有一个动态 IP 地址，请参阅通过 NAT 配置路由器间动态到静态 IPSec 以及本文。

使用的组件

本文档中的信息基于以下软件和硬件版本。

• Cisco 827 12.1(5)YB4

• Cisco 3600 12.1(5)T8

• Cisco 6400 12.1(1)DC1

本文档中的信息都是基于特定实验室环境中的设备创建的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您是在真实网络上操作，请确保您在使用任何命令前已经了解其潜在影响。

配置

本部分提供有关如何配置本文档所述功能的信息。

网络图

本文档使用下图所示的网络设置。

配置

本文档使用如下所示的配置。

• Cisco 827 (CPE)

• 路由器灯

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)。

version 12.1
no service single-slot-reload-enable
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 827
!
logging rate-limit console 10 except errors
!
ip subnet-zero
no ip finger
!
no ip dhcp-client network-discovery
vpdn enable
 
no vpdn logging
!
vpdn-group pppoe
 request-dialin
  protocol pppoe
!
!
!
crypto isakmp policy 20
 encr 3des
 authentication pre-share
 group 2
crypto isakmp key sharedkey address 30.30.30.30
!
!
crypto ipsec transform-set dsltest esp-3des esp-md5-hmac 
!
crypto map test 10 ipsec-isakmp   
 set peer 30.30.30.30
 set transform-set dsltest 
 match address 101
!
interface Ethernet0
 ip address 192.168.100.100 255.255.255.0
 ip nat inside
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 bundle-enable
 dsl operating-mode ansi-dmt
!
interface ATM0.1 point-to-point
 pvc 0/33 

!--- This is usually provided by the ISP.

  protocol pppoe
 pppoe-client dial-pool-number 1
!
!
interface Dialer1
 ip address 20.20.20.20 255.255.255.0

!--- This is provided by the ISP. !--- Another variation is ip address negotiated.

 ip mtu 1492
 ip Nat outside
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 dialer pool 1
 ppp authentication chap callin
 ppp chap hostname testuser
 ppp chap password 7 00071A1507545A545C
 crypto map test
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
no ip http server
!
ip Nat inside source route-map nonat interface Dialer1 overload
access-list 1 permit 192.168.100.0 0.0.0.255
access-list 101 permit ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255
access-list 105 deny   ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255
access-list 105 permit ip 192.168.100.0 0.0.0.255 any
!
route-map nonat permit 10
 match ip address 105
!
!
line con 0
 transport input none
 stopbits 1
line vty 0 4
 login
!
scheduler max-task-time 5000
end

version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname light
!
boot system flash:c3660-jk2s-mz.121-5.T8.bin
logging buffered 4096 debugging
logging rate-limit console 10 except errors
!
ip subnet-zero
!
no ip finger
!
ip cef
!
crypto isakmp policy 20
 encr 3des
 authentication pre-share
 group 2
crypto isakmp key sharedkey address 20.20.20.20
!
crypto ipsec transform-set dsltest esp-3des esp-md5-hmac 
!
crypto map test 10 ipsec-isakmp   
 set peer 20.20.20.20
 set transform-set dsltest 
 match address 101
!
call rsvp-sync
cns event-service server
!
!
!
controller E1 2/0
!
!
interface FastEthernet0/0
 ip address 192.168.200.200 255.255.255.0
 ip Nat inside
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 30.30.30.30 255.255.255.0
 ip Nat outside
 duplex auto
 speed auto
 crypto map test
!
interface Serial1/0
 no ip address
 shutdown
!
interface Serial1/1
 no ip address
 shutdown
!         
interface Serial1/2
 no ip address
 shutdown
!
interface Serial1/3
 no ip address
 shutdown
!
interface BRI4/0
 no ip address
 shutdown
!
interface BRI4/1
 no ip address
 shutdown
!
interface BRI4/2
 no ip address
 shutdown
!
interface BRI4/3
 no ip address
 shutdown 
!
ip kerberos source-interface any
ip Nat inside source route-map nonat interface FastEthernet0/1 overload
ip classless
ip route 0.0.0.0 0.0.0.0 30.30.30.1
ip http server
!
access-list 101 permit ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255
access-list 105 deny   ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255
access-list 105 permit ip 192.168.200.0 0.0.0.255 any
!
route-map nonat permit 10
 match ip address 105
!
!
dial-peer cor custom
!
!
line con 0
 exec-timeout 0 0
 transport input none
line 97 108
line aux 0
line vty 0 4
 login
!
end

验证

本部分所提供的信息可用于确认您的配置是否正常工作。

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：要确切了解以下show命令的含义，请参阅IP安全故障排除 — 了解和使用调试命令。

• show crypto isakmp sa - 显示对等体之间建立的 Internet 安全关联管理协议 (ISAKMP) 安全关联 (SA)。

• show crypto ipsec sa - 显示对等体之间建立的 IPSec SA。

• show crypto engine connections active - 显示已建立的每个阶段 2 SA 和已发送的流量。

Router IPSec Good show 命令

• show crypto isakmp sa

  Cisco 827 (CPE)

  dst	src	状态	conn-id	插槽
  30.30.30.30	20.20.20.20	QM-IDLE	1	0

  路由器灯

  dst	src	状态	conn-id	插槽
  30.30.30.30	20.20.20.20	QM_IDLE	1	0

• show crypto engine connections active

  Cisco 827 (CPE)

  ID	接口	IP Address	状态	算法	加密	解密
  1	< 无 >	< 无 >	集	HMAC_SHA+3DES_56_C	0	0
  2000	Dialer 1	20.20.20.20	集	HMAC_MD5+3DES_56_C	0	104
  2001	Dialer 1	20.20.20.20	集	HMAC_MD5+3DES_56_C	104	0

  路由器灯

  ID	接口	IP Address	状态	算法	加密	解密
  1	Fastethernet 0/1	30.30.30.30	集	HMAC_SHA+3DES_56	0	0
  1960	Fastethernet 0/1	30.30.30.30	集	HMAC_MD5+3DES_56_C	0	104
  1961	Fastethernet 0/1	30.30.30.30	集	HMAC_MD5+3DES_56_C	104	0

• show crypto ipsec sa

827#show crypto ipsec sa

interface: Dialer1
Crypto map tag: test, local addr. 20.20.20.20

local ident (addr/mask/prot/port): (192.168.100.0/255.255.255.0/0/0)
remote ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0)
current_peer: 30.30.30.30
PERMIT, flags={origin_is_acl,}
#pkts encaps: 208, #pkts encrypt: 208, #pkts digest 208
#pkts decaps: 208, #pkts decrypt: 208, #pkts verify 208
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 2, #recv errors 0

local crypto endpt.: 20.20.20.20, remote crypto endpt.: 30.30.30.30
path mtu 1500, media mtu 1500
current outbound spi: 4FE59EF2

inbound esp sas:
spi: 0x3491ACD6(881962198)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 2000, flow_id: 1, crypto map: test
sa timing: remaining key lifetime (k/sec): (4607840/3301)
IV size: 8 bytes
replay detection support: Y

inbound ah sas:

inbound pcp sas:

outbound esp sas:
spi: 0x4FE59EF2(1340448498)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 2001, flow_id: 2, crypto map: test
sa timing: remaining key lifetime (k/sec): (4607837/3301)
IV size: 8 bytes
replay detection support: Y

outbound ah sas:

outbound pcp sas:

interface: Virtual-Access1
Crypto map tag: test, local addr. 20.20.20.20

local ident (addr/mask/prot/port): (192.168.100.0/255.255.255.0/0/0)
remote ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0)
current_peer: 30.30.30.30
PERMIT, flags={origin_is_acl,}
#pkts encaps: 208, #pkts encrypt: 208, #pkts digest 208
#pkts decaps: 208, #pkts decrypt: 208, #pkts verify 208
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 2, #recv errors 0

local crypto endpt.: 20.20.20.20, remote crypto endpt.: 30.30.30.30
path mtu 1500, media mtu 1500
current outbound spi: 4FE59EF2

inbound esp sas:
spi: 0x3491ACD6(881962198)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 2000, flow_id: 1, crypto map: test
sa timing: remaining key lifetime (k/sec): (4607840/3301)
IV size: 8 bytes
replay detection support: Y

inbound ah sas:

inbound pcp sas:

outbound esp sas:
spi: 0x4FE59EF2(1340448498)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 2001, flow_id: 2, crypto map: test
sa timing: remaining key lifetime (k/sec): (4607837/3301)
IV size: 8 bytes
replay detection support: Y

outbound ah sas:

outbound pcp sas:

故障排除

本部分提供的信息可用于对配置进行故障排除。

故障排除命令

注：在发出debug命令之前，请参阅有关Debug命令和IP安全故障排除的重要信息 — 了解和使用Debug命令。

• debug crypto ipsec - 显示第 2 阶段的 IPSec 协商。

• debug crypto isakmp 显示第 1 阶段的 ISAKMP 协商。

• debug crypto engine - 显示加密的流量。

• ping -通过 VPN 隧道显示连接，并且可与 debug and show 命令配合使用。

827#ping 
Protocol [ip]: 
Target IP address: 192.168.200.200
Repeat count [5]: 100
Datagram size [100]: 1600
Timeout in seconds [2]: 
Extended commands [n]: y
Source address or interface: 192.168.100.100
Type of service [0]: 
Set DF bit in IP header? [no]: 
Validate reply data? [no]: 
Data pattern [0xABCD]: 
Loose, Strict, Record, Timestamp, Verbose[none]: 
Sweep range of sizes [n]: 
Type escape sequence to abort.
Sending 100, 1600-byte ICMP Echos to 192.168.200.200, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 264/266/276 ms

相关信息

• IPSec 支持页
• IP 路由支持页
• IPSec 加密简介
• Cisco 827 路由器故障排除
• 技术支持 - Cisco Systems