使用IPSec配置Cisco Secure PIX防火牆6.0和Cisco VPN客戶端

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已更新: 2008 年 10 月 13 日
文件 ID:14091

無偏見用語

本產品的文件集力求使用無偏見用語。針對本文件集的目的，無偏見係定義為未根據年齡、身心障礙、性別、種族身分、民族身分、性別傾向、社會經濟地位及交織性表示歧視的用語。由於本產品軟體使用者介面中硬式編碼的語言、根據 RFP 文件使用的語言，或引用第三方產品的語言，因此本文件中可能會出現例外狀況。深入瞭解思科如何使用包容性用語。

關於此翻譯

思科已使用電腦和人工技術翻譯本文件，讓全世界的使用者能夠以自己的語言理解支援內容。請注意，即使是最佳機器翻譯，也不如專業譯者翻譯的內容準確。Cisco Systems, Inc. 對這些翻譯的準確度概不負責，並建議一律查看原始英文文件（提供連結）。

簡介

Cisco Secure PIX防火牆軟體版本6.0和更高版本支援來自Cisco VPN客戶端3.x和4.x的連線。此示例配置顯示了兩個不同版本的VPN客戶端，它們連線並加密以PIX作為隧道端點的流量。在此配置中，地址池配置為分配給IP安全(IPSec)。

必要條件

需求

此示例配置假設PIX已經使用適當的靜態、管道或訪問清單運行。本文檔並非旨在說明這些基本概念，而是展示從Cisco VPN客戶端到PIX的連線。

採用元件

本文中的資訊係根據以下軟體和硬體版本：

  • PIX軟體版本6.2(1)

    注意：此安裝程式已在PIX軟體版本6.2(1)上測試，但應能運行回到6.0(1)的早期版本以及更高版本。

  • Cisco VPN使用者端版本3.6版本

    注意：此安裝程式已在VPN Client v4.0 Rel上測試，但應能運行回到3.0的早期版本和當前版本。

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。

網路圖表

本檔案會使用以下網路設定：

pix3000-01.gif

配置PIX

註：使用Command Lookup Tool(僅限註冊客戶)查詢有關本文檔中使用的命令的更多資訊。

PIX 
PIX Version 6.2(1)
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password OnTrBUG1Tp0edmkr encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname goss-d3-pix515b
domain-name rtp.cisco.com
fixup protocol ftp 21
fixup protocol http 80
fixup protocol h323 1720
fixup protocol rsh 514
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol sip 5060
fixup protocol skinny 2000
names
!

!--- Access list to avoid Network Address Translation (NAT) !--- on the IPSec packets.

access-list 101 permit ip 10.1.1.0 255.255.255.0 10.1.2.0 255.255.255.0 
pager lines 24
interface ethernet0 auto
interface ethernet1 auto
mtu outside 1500
mtu inside 1500
!

!--- IP addresses on the interfaces

ip address outside 172.18.124.216 255.255.255.0
ip address inside 10.1.1.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool ippool 10.1.2.1-10.1.2.254
no failover
failover timeout 0:00:00
failover poll 15
failover ip address outside 0.0.0.0
failover ip address inside 0.0.0.0
pdm history enable
arp timeout 14400
!

!--- Binding ACL 101 to the NAT statement to avoid NAT !--- on the IPSec packets.

nat (inside) 0 access-list 101
!

!--- Default route to the Internet.

route outside 0.0.0.0 0.0.0.0 172.18.124.1 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 
   h323 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 RADIUS protocol radius 
http server enable
http 1.2.3.5 255.255.255.255 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
!

!--- The sysopt command avoids conduit !--- on the IPSec encrypted traffic.

sysopt connection permit-ipsec
no sysopt route dnat
!

!--- Phase 2 encryption type

crypto ipsec transform-set myset esp-des esp-md5-hmac 
crypto dynamic-map dynmap 10 set transform-set myset
crypto map mymap 10 ipsec-isakmp dynamic dynmap
!

!--- Binding the IPSec engine on the outside interface.

crypto map mymap interface outside
!

!--- Enabling Internet Security Association and !--- Key Management Protocol (ISAKMP) key exchange.

isakmp enable outside
isakmp identity address
!

!--- ISAKMP policy for VPN Client running 3.x or 4.x code.

isakmp policy 10 authentication pre-share
isakmp policy 10 encryption des
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
!

!--- IPSec group configuration for either VPN Client.

vpngroup vpn3000 address-pool ippool
vpngroup vpn3000 dns-server 10.1.1.2
vpngroup vpn3000 wins-server 10.1.1.2
vpngroup vpn3000 default-domain cisco.com
vpngroup vpn3000 idle-time 1800
vpngroup vpn3000 password ********

!--- To allow simultaneous access to the !--- internal network and to the Internet.

vpngroup vpn3000 split-tunnel 101
telnet timeout 5
ssh timeout 5
terminal width 80
Cryptochecksum:94da63fc0bb8ce167407b3ea21c6642c
: end
[OK]

配置Cisco VPN客戶端

完成以下步驟，以便使用VPN客戶端建立新連線。

  1. 啟動VPN客戶端，然後按一下New建立新連線。

    pix3000-02.gif

  2. 輸入新連線的配置資訊。

    • 在Connection Entry欄位中，為您的條目分配一個名稱。

    • 在Host欄位中，輸入PIX公共介面的IP地址。

    • 選擇Authentication頁籤，然後輸入組和密碼（兩次 — 確認）。

    • 完成後，按一下「Save」。

    pix3000-03.gif

  3. 按一下Connect連線到PIX。

    pix3000-04.gif

驗證

使用本節內容，確認您的組態是否正常運作。

輸出直譯器工具(僅供已註冊客戶使用)(OIT)支援某些show命令。使用OIT檢視show命令輸出的分析。

  • show crypto isakmp sa — 檢視對等體上的所有當前網際網路金鑰交換(IKE)安全關聯(SA)。

  • show crypto ipsec sa — 檢視當前SA使用的設定。

疑難排解

使用本節內容，對組態進行疑難排解。

疑難排解指令

附註：使用 debug 指令之前，請先參閱有關 Debug 指令的重要資訊。

  • debug crypto ipsec — 用於檢視階段2的IPSec協商。

  • debug crypto isakmp — 用於檢視階段1的ISAKMP協商。

  • debug crypto engine — 顯示加密的流量。

調試輸出示例

以下是使用Cisco VPN 3.0.x使用者端產生的良好偵錯範例：

goss-d3-pix515b#debug crypto isakmp 
goss-d3-pix515b#debug crypto ipsec 
goss-d3-pix515b#debug crypto engine 
goss-d3-pix515b#show debug 
debug crypto ipsec 1 
debug crypto isakmp 1 
debug crypto engine 
debug fover status 
        tx      Off 
        rx      Off 
        open    Off 
        cable   Off 
        txdmp   Off 
        rxdmp   Off 
        ifc     Off 
        rxip    Off 
        txip    Off 
        get     Off 
        put     Off 
        verify  Off 
        switch  Off 
        fail    Off 
        fmsg    Off 
goss-d3-pix515b# goss-d3-pix515b# 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
OAK_AG exchange 
ISAKMP (0): processing SA payload. message ID = 0 

ISAKMP (0): Checking ISAKMP transform 1 against priority 10 policy 
ISAKMP:      encryption 3DES-CBC 
ISAKMP:      hash SHA 
ISAKMP:      default group 2 
ISAKMP:      extended auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are not acceptable. Next payload is 3 
ISAKMP (0): Checking ISAKMP transform 2 against priority 10 policy 
ISAKMP:      encryption 3DES-CBC 
ISAKMP:      hash MD5 
ISAKMP:      default group 2 
ISAKMP:      extended auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are not acceptable. Next payload is 3 
ISAKMP (0): Checking ISAKMP transform 3 against priority 10 policy 
ISAKMP:      encryption 3DES-CBC 
ISAKMP:      hash SHA 
ISAKMP:      default group 2 
ISAKMP:      auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are not acceptable. Next payload is 3 
ISAKMP (0): Checking ISAKMP transform 4 against priority 10 policy 
ISAKMP:      encryption 3DES-CBC 
ISAKMP:      hash MD5 
ISAKMP:      default group 2 
ISAKMP:      auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are not acceptable. Next payload is 3 
ISAKMP (0): Checking ISAKMP transform 5 against priority 10 policy 
ISAKMP:      encryption DES-CBC 
ISAKMP:      hash SHA 
ISAKMP:      default group 2 
ISAKMP:      extended auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are not acceptable. Next payload is 3 
ISAKMP (0): Checking ISAKMP transform 6 against priority 10 policy 
ISAKMP:      encryption DES-CBC 
ISAKMP:      hash MD5 
ISAKMP:      default group 2 
ISAKMP:      extended auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are not acceptable. Next payload is 3 
ISAKMP (0): Checking ISAKMP transform 7 against priority 10 policy 
ISAKMP:      encryption DES-CBC 
ISAKMP:      hash SHA 
ISAKMP:      default group 2 
ISAKMP:      auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are not acceptable. Next payload is 3 
ISAKMP (0): Checking ISAKMP transform 8 against priority 10 policy 
ISAKMP:      encryption DES-CBC 
ISAKMP:      hash MD5 
ISAKMP:      default group 2 
ISAKMP:      auth pre-share 
ISAKMP:      life type in seconds 
ISAKMP:      life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are acceptable. Next payload is 0 
ISAKMP (0): processing KE payload. message ID = 0 

ISAKMP (0): processing NONCE payload. message ID = 0 

ISAKMP (0): processing ID payload. message ID = 0 
ISAKMP (0): processing vendor id payload 

ISAKMP (0): processing vendor id payload 

ISAKMP (0): remote peer supports dead peer detection 

ISAKMP (0): processing vendor id payload 

ISAKMP (0): speaking to a Unity client 

ISAKMP: Created a peer node for 172.18.124.96 
ISAKMP (0): ID payload 
        next-payload : 10 
        type         : 1 
        protocol     : 17 
        port         : 500 
        length       : 8 
ISAKMP (0): Total payload length: 12 
return status is IKMP_NO_ERROR 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
OAK_AG exchange 
ISAKMP (0): processing HASH payload. message ID = 0 
ISAKMP (0): processing NOTIFY payload 24578 protocol 1 
        spi 0, message ID = 0 
ISAKMP (0): processing notify INITIAL_CONTACT
IPSEC(key_engine): got a queue event... 
IPSEC(key_engine_delete_sas): rec'd delete notify from ISAKMP 
IPSEC(key_engine_delete_sas): delete all SAs shared 
    with 172.18.124.96 

ISAKMP (0): SA has been authenticated 
return status is IKMP_NO_ERROR 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
ISAKMP_TRANSACTION exchange 
ISAKMP (0:0): processing transaction payload 
    from 172.18.124.96. message ID = 0 
ISAKMP: Config payload CFG_REQUEST 
ISAKMP (0:0): checking request: 
ISAKMP: attribute    IP4_ADDRESS (1) 
ISAKMP: attribute    IP4_NETMASK (2) 
ISAKMP: attribute    IP4_DNS (3) 
ISAKMP: attribute    IP4_NBNS (4) 
ISAKMP: attribute    ADDRESS_EXPIRY (5) 
        Unsupported Attr: 5 
ISAKMP: attribute    APPLICATION_VERSION (7) 
        Unsupported Attr: 7 
ISAKMP: attribute    UNKNOWN (28672) 
        Unsupported Attr: 28672 
ISAKMP: attribute    UNKNOWN (28673) 
        Unsupported Attr: 28673 
ISAKMP: attribute    UNKNOWN (28674) 
ISAKMP: attribute    UNKNOWN (28676) 
ISAKMP: attribute    UNKNOWN (28679) 
        Unsupported Attr: 28679 
ISAKMP (0:0): responding to peer config from 172.18.124.96. 
    ID = 525416177 
return status is IKMP_NO_ERROR 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
OAK_QM exchange 
oakley_process_quick_mode: 
OAK_QM_IDLE 
ISAKMP (0): processing SA payload. message ID = 805890102 

ISAKMP : Checking IPSec proposal 1 

ISAKMP: transform 1, ESP_3DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-MD5 
ISAKMP:      encaps is 1 
ISAKMP:      SA life type in seconds 
ISAKMP:      SA life duration (VPI) of  0x0 0x20 0xc4 0x9b 
IPSEC(validate_proposal): transform proposal (prot 3, trans 3, 
    hmac_alg 1) not supported 

ISAKMP (0): atts not acceptable. Next payload is 0 
ISAKMP (0): skipping next ANDed proposal (1) 
ISAKMP : Checking IPSec proposal 2 

ISAKMP: transform 1, ESP_3DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-SHA 
ISAKMP:      encaps is 1 
ISAKMP:      SA life type in seconds 
ISAKMP:      SA life duration (VPI) of  0x0 0x20 0xc4 0x9b 
IPSEC(validate_proposal): transform proposal (prot 3, trans 3, 
    hmac_alg 2) not supported 

ISAKMP (0): atts not acceptable. Next payload is 0 
ISAKMP (0): skipping next ANDed proposal (2) 
ISAKMP : Checking IPSec proposal 3 

ISAKMP: transform 1, ESP_3DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-MD5 
ISAKMP:      encaps is 1 
ISAKMP:      SA life type in seconds 
ISAKMP:      SA life duration (VPI) of  0x0 0x20 0xc4 0x9b 
IPSEC(validate_proposal): transform proposal (prot 3, trans 3, 
    hmac_alg 1) not supported 

ISAKMP (0): atts not acceptable. Next payload is 0 
ISAKMP : Checking IPSec proposal 4 

ISAKMP: transform 1, ESP_3DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-SHA 
ISAKMP:      encaps is 1 
ISAKMP:      SA life type in seconds 
ISAKMP:      SA life duration (VPI) of  0x0 0x20 0xc4 0x9b 
IPSEC(validate_proposal): transform proposal (prot 3, trans 3, 
    hmac_alg 2) not supported 

ISAKMP (0): atts not acceptable. Next payload is 0 
ISAKMP : Checking IPSec proposal 5 

ISAKMP: transform 1, ESP_DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-MD5 
ISAKMP:      encaps is 1 
ISAKMP:      SA life type in seconds 
ISAKMP:      SA life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are acceptable. 
ISAKMP (0): bad SPI size of 2 octets! 
ISAKMP : Checking IPSec proposal 6 

ISAKMP: transform 1, ESP_DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-SHA 
ISAKMP:      encaps is 1 
ISAKMP:      SA life type in seconds 
ISAKMP:      SA life duration (VPI) of  0x0 0x20 0xc4 0x9b 
IPSEC(validate_proposal): transform proposal (prot 3, trans 2, 
    hmac_alg 2) not supported 

ISAKMP (0): atts not acceptable. Next payload is 0 
ISAKMP (0): skipping next ANDed proposal (6) 
ISAKMP : Checking IPSec proposal 7 

ISAKMP: transform 1, ESP_DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-MD5 
ISAKMP:      encaps is 1 
ISAKMP:      SA life type in seconds 
ISAKMP:      SA life duration (VPI) of  0x0 0x20 0xc4 0x9b 
ISAKMP (0): atts are acceptable.
IPSEC(validate_proposal_request): proposal part #1, 
  (key eng. msg.) dest= 172.18.124.216, src= 172.18.124.96, 
    dest_proxy= 172.18.124.216/255.255.255.255/0/0 (type=1), 
    src_proxy= 10.1.2.1/255.255.255.255/0/0 (type=1), 
    protocol= ESP, transform= esp-des esp-md5-hmac , 
    lifedur= 0s and 0kb, 
    spi= 0x0(0), conn_id= 0, keysize= 0, flags= 0x4 

ISAKMP (0): processing NONCE payload. message ID = 805890102 

ISAKMP (0): processing ID payload. message ID = 805890102 
ISAKMP (0): ID_IPV4_ADDR src 10.1.2.1 prot 0 port 0 
ISAKMP (0): processing ID payload. message ID = 805890102 
ISAKMP (0): ID_IPV4_ADDR dst 172.18.124.216 prot 0 port 0
IPSEC(key_engine): got a queue event... 
IPSEC(spi_response): getting spi 0x13b00d31(330304817) for SA 
        from   172.18.124.96 to  172.18.124.216 for prot 3 

return status is IKMP_NO_ERROR 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
OAK_QM exchange 
oakley_process_quick_mode: 
OAK_QM_IDLE 
ISAKMP (0): processing SA payload. message ID = 935083707 

ISAKMP : Checking IPSec proposal 1 

ISAKMP: transform 1, ESP_3DES 
ISAKMP:   attributes in transform: 
ISAKMP:      authenticator is HMAC-MD5 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
OAK_QM exchange 
oakley_process_quick_mode: 
OAK_QM_AUTH_AWAITmap_alloc_entry: allocating entry 1 
map_alloc_entry: allocating entry 2 
ISAKMP (0): Creating IPSec SAs 
        inbound SA from   172.18.124.96 to  172.18.124.216 
		(proxy        10.1.2.1 to  172.18.124.216) 
        has spi 330304817 and conn_id 1 and flags 4 
        lifetime of 2147483 seconds 
        outbound SA from  172.18.124.216 to   172.18.124.96 
		(proxy  172.18.124.216 to        10.1.2.1) 
        has spi 2130279708 and conn_id 2 and flags 4 
        lifetime of 2147483 secondsIPSEC(key_engine): got a queue event... 
IPSEC(initialize_sas): , 
  (key eng. msg.) dest= 172.18.124.216, src= 172.18.124.96, 
    dest_proxy= 172.18.124.216/0.0.0.0/0/0 (type=1), 
    src_proxy= 10.1.2.1/0.0.0.0/0/0 (type=1), 
    protocol= ESP, transform= esp-des esp-md5-hmac , 
    lifedur= 2147483s and 0kb, 
    spi= 0x13b00d31(330304817), conn_id= 1, keysize= 0, flags= 0x4 
IPSEC(initialize_sas): , 
  (key eng. msg.) src= 172.18.124.216, dest= 172.18.124.96, 
    src_proxy= 172.18.124.216/0.0.0.0/0/0 (type=1), 
    dest_proxy= 10.1.2.1/0.0.0.0/0/0 (type=1), 
    protocol= ESP, transform= esp-des esp-md5-hmac , 
    lifedur= 2147483s and 0kb, 
    spi= 0x7ef97d1c(2130279708), conn_id= 2, keysize= 0, flags= 0x4 

return status is IKMP_NO_ERROR 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
OAK_QM exchange 
oakley_process_quick_mode: 
OAK_QM_AUTH_AWAITmap_alloc_entry: allocating entry 3 
map_alloc_entry: allocating entry 4 

ISAKMP (0): Creating IPSec SAs 
        inbound SA from   172.18.124.96 to  172.18.124.216 
		(proxy        10.1.2.1 to         0.0.0.0) 
        has spi 4139858833 and conn_id 3 and flags 4 
        lifetime of 2147483 seconds 
        outbound SA from  172.18.124.216 to   172.18.124.96 (
		proxy         0.0.0.0 to        10.1.2.1) 
        has spi 1487433401 and conn_id 4 and flags 4 
        lifetime of 2147483 seconds
IPSEC(key_engine): got a queue event... 
IPSEC(initialize_sas): , 
  (key eng. msg.) dest= 172.18.124.216, src= 172.18.124.96, 
    dest_proxy= 0.0.0.0/0.0.0.0/0/0 (type=4), 
    src_proxy= 10.1.2.1/0.0.0.0/0/0 (type=1), 
    protocol= ESP, transform= esp-des esp-md5-hmac , 
    lifedur= 2147483s and 0kb, 
    spi= 0xf6IPSEC(initialize_sas): , 
  (key eng. msg.) src= 172.18.124.216, dest= 172.18.124.96, 
    src_proxy= 0.0.0.0/0.0.0.0/0/0 (type=4), 
    dest_proxy= 10.1.2.1/0.0.0.0/0/0 (type=1), 
    protocol= ESP, transform= esp-des esp-md5-hmac , 
    lifedur= 2147483s and 0kb, 
    spi= 0x58a86eb9(1487433401), conn_id= 4, keysize= 0, flags= 0x4 

return status is IKMP_NO_ERROR 
crypto_isakmp_process_block: src 172.18.124.96, dest 172.18.124.216 
ISAKMP (0): processing NOTIFY payload 36136 protocol 1 
        spi 0, message ID = 1617869510 
ISAMKP (0): received DPD_R_U_THERE from peer 172.18.124.96 
ISAKMP (0): sending NOTIFY message 36137 protocol 1 
return status is IKMP_NO_ERR_NO_TRANS 
goss-d3-pix515b# 
goss-d3-pix515b# 
goss-d3-pix515b#no debug crypto isakmp 
goss-d3-pix515b#no debug crypto ipsec 
goss-d3-pix515b#no debug crypto engine 
goss-d3-pix515b#

相關資訊

修訂記錄

修訂 發佈日期 意見
1.0
13-Oct-2008
初始版本

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