使用AES加密配置IOS到IOS IPSec

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已更新: 2006 年 2 月 2 日
文件 ID:43069

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簡介

本檔案將提供使用進階加密標準(AES)加密的IOS到IOS IPSec通道組態範例。

必要條件

需求

Cisco IOS® 12.2(13)T已引入AES加密支援。

採用元件

本文中的資訊係根據以下軟體和硬體版本：

  • Cisco IOS 軟體版本 12.3(10)

  • 思科1721路由器

本文中的資訊是根據特定實驗室環境內的裝置所建立。文中使用到的所有裝置皆從已清除（預設）的組態來啟動。如果您的網路正在作用，請確保您已瞭解任何指令可能造成的影響。

慣例

如需文件慣例的詳細資訊，請參閱思科技術提示慣例。

設定

本節提供用於設定本文件中所述功能的資訊。

注意：要查詢有關本文檔中使用的命令的其他資訊，請使用命令查詢工具(僅限註冊客戶)。

組態

本文檔使用此處所示的配置。

路由器1721-A 
R-1721-A#show run
Building configuration...

Current configuration : 1706 bytes
!
! Last configuration change at 00:46:32 UTC Fri Sep 10 2004
! NVRAM config last updated at 00:45:48 UTC Fri Sep 10 2004
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R-1721-A
!
boot-start-marker
boot-end-marker
!
!
memory-size iomem 15
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
no ip domain lookup
no ftp-server write-enable
!
!
! 
!


!--- Define Internet Key Exchange (IKE) policy.

crypto isakmp policy 10

!--- Specify the 256-bit AES as the !--- encryption algorithm within an IKE policy.

 encr aes 256

!--- Specify that pre-shared key authentication is used.

 authentication pre-share


!--- Specify the shared secret.

crypto isakmp key cisco123 address 10.48.66.146
!
!

!--- Define the IPSec transform set.

crypto ipsec transform-set aesset esp-aes 256 esp-sha-hmac 
!

!--- Define crypto map entry name "aesmap" that will use !--- IKE to establish the security associations (SA).

crypto map aesmap 10 ipsec-isakmp 

!--- Specify remote IPSec peer.

 set peer 10.48.66.146

!--- Specify which transform sets !--- are allowed for this crypto map entry.

 set transform-set aesset 

!--- Name the access list that determines which traffic !--- should be protected by IPSec.

 match address acl_vpn
!
!
!
interface ATM0
 no ip address
 shutdown
 no atm ilmi-keepalive
 dsl equipment-type CPE
 dsl operating-mode GSHDSL symmetric annex A
 dsl linerate AUTO
!
interface Ethernet0
 ip address 192.168.100.1 255.255.255.0
 ip nat inside
 half-duplex
!
interface FastEthernet0
 ip address 10.48.66.147 255.255.254.0
 ip nat outside
 speed auto

!--- Apply crypto map to the interface.

 crypto map aesmap
!
ip nat inside source list acl_nat interface FastEthernet0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 10.48.66.1
ip route 192.168.200.0 255.255.255.0 FastEthernet0
no ip http server
no ip http secure-server
!


ip access-list extended acl_nat

!--- Exclude protected traffic from being NAT'ed.

 deny   ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255
 permit ip 192.168.100.0 0.0.0.255 any


!--- Access list that defines traffic protected by IPSec.

ip access-list extended acl_vpn
 permit ip 192.168.100.0 0.0.0.255 192.168.200.0 0.0.0.255
!
!
line con 0
 exec-timeout 0 0
line aux 0
line vty 0 4
!
end

R-1721-A#

路由器1721-B 
R-1721-B#show run
Building configuration...

Current configuration : 1492 bytes
!
! Last configuration change at 14:11:41 UTC Wed Sep 8 2004
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R-1721-B
!
boot-start-marker
boot-end-marker
!
!
memory-size iomem 15
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
no ip domain lookup
no ftp-server write-enable
!
!
!
! 
!

!--- Define IKE policy.

crypto isakmp policy 10

!--- Specify the 256-bit AES as the !--- encryption algorithm within an IKE policy.

 encr aes 256

!--- Specify that pre-shared key authentication is used.

 authentication pre-share


!--- Specify the shared secret.

crypto isakmp key cisco123 address 10.48.66.147
!
!

!--- Define the IPSec transform set.

crypto ipsec transform-set aesset esp-aes 256 esp-sha-hmac 
!

!--- Define crypto map entry name "aesmap" that uses !--- IKE to establish the SA.

crypto map aesmap 10 ipsec-isakmp 

!--- Specify remote IPSec peer.

 set peer 10.48.66.147

!--- Specify which transform sets !--- are allowed for this crypto map entry.

 set transform-set aesset 

!--- Name the access list that determines which traffic !--- should be protected by IPSec.

 match address acl_vpn
!
!
!
interface Ethernet0
 ip address 192.168.200.1 255.255.255.0
 ip nat inside
 half-duplex
!
interface FastEthernet0
 ip address 10.48.66.146 255.255.254.0
 ip nat outside
 speed auto

!--- Apply crypto map to the interface.

 crypto map aesmap
!
ip nat inside source list acl_nat interface FastEthernet0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 10.48.66.1
ip route 192.168.100.0 255.255.255.0 FastEthernet0
no ip http server
no ip http secure-server
!
ip access-list extended acl_nat

!--- Exclude protected traffic from being NAT'ed.

 deny   ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255
 permit ip 192.168.200.0 0.0.0.255 any



!--- Access list that defines traffic protected by IPSec.

ip access-list extended acl_vpn
 permit ip 192.168.200.0 0.0.0.255 192.168.100.0 0.0.0.255
!
!
line con 0
 exec-timeout 0 0
line aux 0
line vty 0 4
!
end

R-1721-B#

驗證

本節提供的資訊可用於確認組態是否正常運作。

輸出直譯器工具支援某些show命令(僅供註冊客戶使用)，透過該工具可檢視對show命令輸出的分析。

  • show crypto isakmp sa -顯示Internet Security Association and Key Management Protocol (ISAKMP) SA的狀態。

    路由器1721-A 
    R-1721-A#show crypto isakmp sa     
dst             src             state          conn-id slot
10.48.66.147    10.48.66.146    QM_IDLE              1    0

    路由器1721-B 
    R-1721-B#show crypto isakmp sa     
dst             src             state          conn-id slot
10.48.66.147    10.48.66.146    QM_IDLE              1    0

  • show crypto ipsec sa -顯示有關活動隧道的統計資料。

    路由器1721-A 
    R-1721-A#show crypto ipsec sa

interface: FastEthernet0
    Crypto map tag: aesmap, local addr. 10.48.66.147

   protected vrf: 
   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: 10.48.66.146:500
     PERMIT, flags={origin_is_acl,}
    #pkts encaps: 30, #pkts encrypt: 30, #pkts digest 30
    #pkts decaps: 30, #pkts decrypt: 30, #pkts verify 30
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #send errors 0, #recv errors 0

     local crypto endpt.: 10.48.66.147, remote crypto endpt.: 10.48.66.146
     path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0
     current outbound spi: 2EB0BA1A

     inbound esp sas:
      spi: 0xFECA28BC(4274661564)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2000, flow_id: 1, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4554237/2895)
        IV size: 16 bytes
        replay detection support: Y

     inbound ah sas:

     inbound pcp sas:

     outbound esp sas:
      spi: 0x2EB0BA1A(783333914)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2001, flow_id: 2, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4554237/2894)
        IV size: 16 bytes
        replay detection support: Y

     outbound ah sas:

     outbound pcp sas:
R-1721-A#

    路由器1721-B 
    R-1721-B#show crypto ipsec sa

interface: FastEthernet0
    Crypto map tag: aesmap, local addr. 10.48.66.146

   protected vrf: 
   local  ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (192.168.100.0/255.255.255.0/0/0)
   current_peer: 10.48.66.147:500
     PERMIT, flags={origin_is_acl,}
    #pkts encaps: 30, #pkts encrypt: 30, #pkts digest 30
    #pkts decaps: 30, #pkts decrypt: 30, #pkts verify 30
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #send errors 5, #recv errors 0

     local crypto endpt.: 10.48.66.146, remote crypto endpt.: 10.48.66.147
     path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0
     current outbound spi: FECA28BC

     inbound esp sas:
      spi: 0x2EB0BA1A(783333914)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2000, flow_id: 1, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4583188/2762)
        IV size: 16 bytes
        replay detection support: Y

     inbound ah sas:

     inbound pcp sas:

     outbound esp sas:
      spi: 0xFECA28BC(4274661564)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        slot: 0, conn id: 2001, flow_id: 2, crypto map: aesmap
        sa timing: remaining key lifetime (k/sec): (4583188/2761)
        IV size: 16 bytes
        replay detection support: Y

     outbound ah sas:

     outbound pcp sas:
R-1721-B#

  • show crypto engine connections active -按SA顯示總加密/解密。

    路由器1721-A 
    R-1721-A#show crypto engine connections active 

  ID Interface       IP-Address      State  Algorithm           Encrypt  Decrypt
   1 FastEthernet0   10.48.66.147    set    HMAC_SHA+AES_256_C        0        0
2000 FastEthernet0   10.48.66.147    set    HMAC_SHA+AES_256_C        0       30
2001 FastEthernet0   10.48.66.147    set    HMAC_SHA+AES_256_C       30        0

    路由器1721-B 
    R-1721-B#show crypto engine connections active 

  ID Interface       IP-Address      State  Algorithm           Encrypt  Decrypt
   1 FastEthernet0   10.48.66.146    set    HMAC_SHA+AES_256_C        0        0
2000 FastEthernet0   10.48.66.146    set    HMAC_SHA+AES_256_C        0       30
2001 FastEthernet0   10.48.66.146    set    HMAC_SHA+AES_256_C       30        0

疑難排解

本節提供的資訊可用於對組態進行疑難排解。

疑難排解指令

注意：在發出debug命令之前，請參閱有關Debug命令的重要資訊。

  • debug crypto ipsec -顯示IPSec事件。

  • debug crypto isakmp -顯示有關IKE事件的消息。

  • debug crypto engine -顯示來自加密引擎的資訊。

有關IPSec故障排除的其他資訊，請參閱IP安全故障排除-瞭解和使用debug命令。

相關資訊

修訂記錄

修訂 發佈日期 意見
1.0
28-May-2003
初始版本

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