网络世界的“隐形斗篷”：IPsec NAT穿越技术

释然IT杂谈

发布于 2024-04-10 19:18:45

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发布于 2024-04-10 19:18:45

文章被收录于专栏：释然IT杂谈

前言：

在网络技术领域，我们经常会遇到一种称为IPsec NAT穿越（NAT-T）的技术，它也被称作UDP封装。这项技术的核心作用是在设备缺乏公网IP地址的情况下，确保数据流量能够顺利抵达预定目标。NAT-T的工作原理是在流量通过网关时，保持IPsec VPN连接的畅通无阻。这种情况通常出现在您的互联网服务提供商（ISP）执行网络地址转换（NAT）操作，或者是您的防火墙外部接口连接到了一个启用了NAT功能的设备时。

在我们的网络架构中，存在一个位于中心位置的NAT设备，它可能会破坏数据的完整性和真实性，有时甚至可能对数据包束手无策。众所周知，NAT与IPsec在本质上是不相容的，但幸运的是，我们有了NAT穿越技术这一解决方案。

NAT穿越技术（NAT-T）通过在IPsec数据包中嵌入一个UDP头部以及一个特殊的有效载荷，使得该数据包在NAT设备看来就像是一条普通的UDP数据流。这样一来，NAT设备就能够识别并对数据包进行必要的转换处理，从而确保消息能够顺利传达。这项技术的应用，为我们在复杂的网络环境中实现安全、高效的数据传输提供了可能。

目标

根据图配置拓扑
将IP地址分配给各自的端口
在SITE-A-ROUTER 1 和 2 上配置通往R3 的默认路由
在充当 ISP NAT 设备的路由器 3 上配置静态路由
为需要打通的网段配置扩展 ACL
启用加密 ISAKMP
配置加密 ISAKMP 策略
配置预共享密钥
在两个站点上配置 IPsec 转换集
配置IPsec安全关联生命周期
配置加密映射
在接口上应用加密映射
在路由器3上配置IP静态NAT
在路由器3上配置内部和外部NAT
确保 192.168.10.1 可以通过 IPsec 到达 192.168.20.1，并将 IP 转换为 100.100.100.100

配置：

将IP地址分配给各自的端口

SITE-A-ROUTER(config)#interface serial 4/0
SITE-A-ROUTER(config-if)#ip address 192.168.1.1 255.255.255.0
SITE-A-ROUTER(config-if)#no shutdown
SITE-A-ROUTER(config-if)#exit

SITE-A-ROUTER(config)#interface fastethernet 0/0
SITE-A-ROUTER(config-if)#ip address 192.168.10.1 255.255.255.0
SITE-A-ROUTER(config-if)#no shutdown
SITE-A-ROUTER(config-if)#no keepalive
SITE-A-ROUTER(config-if)#exit

Internet-NAT-Device(config)#interface serial 4/0
Internet-NAT-Device(config-if)#ip address 192.168.1.2 255.255.255.0
Internet-NAT-Device(config-if)#no shutdown
Internet-NAT-Device(config-if)#exit

Internet-NAT-Device(config)#interface serial 4/1
Internet-NAT-Device(config-if)#ip address 192.168.2.2 255.255.255.0
Internet-NAT-Device(config-if)#no shutdown
Internet-NAT-Device(config-if)#exit

SITE-B-ROUTER(config)#interface serial 4/1
SITE-B-ROUTER(config-if)#ip address 192.168.2.1 255.255.255.0
SITE-B-ROUTER(config-if)#no shutdown
SITE-B-ROUTER(config-if)#exit

SITE-B-ROUTER(config)#interface fastethernet 0/0
SITE-B-ROUTER(config-if)#ip address 192.168.20.1 255.255.255.0
SITE-B-ROUTER(config-if)#no shutdown
SITE-B-ROUTER(config-if)#exit

各设备上查看下配置的ip

SITE-A-ROUTER#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            192.168.10.1    YES manual up                    up
Serial4/0                       192.168.1.1     YES manual up                    up

SITE-B-ROUTER#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            192.168.20.1    YES manual up                    up
Serial4/1                       192.168.2.1     YES manual up                    up

Internet-NAT-Device#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
Serial4/0                  192.168.1.2     YES manual up                    up
Serial4/1                  192.168.2.2     YES manual up                    up

在SITE-A-ROUTER 1 和 2 上配置通往R3 的默认路由

SITE-A-ROUTER(config)#ip route 0.0.0.0 0.0.0.0 serial 4/0
SITE-A-ROUTER(config)#end

SITE-B-ROUTER(config)#ip route 0.0.0.0 0.0.0.0 serial 4/1
SITE-B-ROUTER(config)#end

Internet-NAT-Device(config)#ip route 192.168.10.0 255.255.255.0 192.168.1.1
Internet-NAT-Device(config)#ip route 192.168.20.0 255.255.255.0 192.168.2.1
Internet-NAT-Device(config)#end

为需要打通的网段配置扩展 ACL

SITE-A-ROUTER(config)#ip access-list extended important-traffic
SITE-A-ROUTER(config-ext-nacl)#permit ip 192.168.10.0 0.0.0.255 192.168.20.0 0.0.0.255
SITE-A-ROUTER(config-ext-nacl)#exit

SITE-B-ROUTER(config)#ip access-list extended important-traffic
SITE-B-ROUTER(config-ext-nacl)#permit ip 192.168.20.0 0.0.0.255 192.168.10.0 0.0.0.255
SITE-B-ROUTER(config-ext-nacl)#end

查看配置ACL

SITE-A-ROUTER#show ip access-list
Extended IP access list important-traffic
    10 permit ip 192.168.10.0 0.0.0.255 192.168.20.0 0.0.0.255

SITE-B-ROUTER#show ip access-list
Extended IP access list important-traffic
    10 permit ip 192.168.20.0 0.0.0.255 192.168.10.0 0.0.0.255

启用加密 ISAKMP

SITE-A-ROUTER(config)#crypto isakmp enable

SITE-B-ROUTER(config)#crypto isakmp enable

配置加密 ISAKMP 策略

SITE-A-ROUTER(config)#crypto isakmp policy 20
SITE-A-ROUTER(config-isakmp)#authentication pre-share
SITE-A-ROUTER(config-isakmp)#encryption aes 256
SITE-A-ROUTER(config-isakmp)#hash sha
SITE-A-ROUTER(config-isakmp)#group 5
SITE-A-ROUTER(config-isakmp)#lifetime 3600
SITE-A-ROUTER(config-isakmp)#exit

SITE-B-ROUTER(config)#crypto isakmp policy 20
SITE-B-ROUTER(config-isakmp)#authentication pre-share
SITE-B-ROUTER(config-isakmp)#encryption aes 256
SITE-B-ROUTER(config-isakmp)#hash sha
SITE-B-ROUTER(config-isakmp)#group 5
SITE-B-ROUTER(config-isakmp)#lifetime 3600
SITE-B-ROUTER(config-isakmp)#end

查看配置的ISAKMP 策略

SITE-A-ROUTER#show crypto isakmp policy
Global IKE policy
Protection suite of priority 20
        encryption algorithm:   AES - Advanced Encryption Standard (256 bit keys).
        hash algorithm:         Secure Hash Standard
        authentication method:  Pre-Shared Key
        Diffie-Hellman group:   #5 (1536 bit)
        lifetime:               3600 seconds, no volume limit

SITE-B-ROUTER#show crypto isakmp policy
Global IKE policy
Protection suite of priority 20
        encryption algorithm:   AES - Advanced Encryption Standard (256 bit keys).
        hash algorithm:         Secure Hash Standard
        authentication method:  Pre-Shared Key
        Diffie-Hellman group:   #5 (1536 bit)
        lifetime:               3600 seconds, no volume limit

置预共享密钥

SITE-A-ROUTER(config)#crypto isakmp key 0 internetworks address 192.168.2.1
SITE-A-ROUTER(config)#end

SITE-B-ROUTER(config)#crypto isakm key 0 internetworks address 100.100.100.100
SITE-B-ROUTER(config)#end
//在上面的命令中，我已经将路由器2上的地址从192.168.1.1更改为100.100.100.100，因为路由器1的IP 192.168.1.1在另一端看起来会不同，即100.100.100.100。接下来，我打算只在路由器2上更改加密映射中的对等地址，因此我们需要将地址更改为静态NAT地址，以便获得成功的IPsec VPN结果。
//在配置IPsec VPN时，确保两端的对等设备能够正确识别对方的地址至关重要。在这个场景中，路由器1的内部IP地址是192.168.1.1，而这个地址在通过NAT设备后，在外部网络中将被转换为100.100.100.100。为了确保路由器2能够正确地识别并建立与路由器1的VPN连接，我们需要在路由器2的加密映射配置中更新对等地址，将其设置为经过NAT转换后的静态IP地址100.100.100.100。
//这样，当路由器2尝试与路由器1建立VPN隧道时，它将使用正确的IP地址进行通信，从而确保IPsec VPN连接的成功建立和稳定运行。通过这种方式，即使在NAT环境下，也能够实现跨网络的安全数据传输。

在两个站点上配置 IPsec 转换集

SITE-A-ROUTER(config)#crypto ipsec transform-set TRANSF-SET esp-aes 256 esp-sha-hmac
SITE-A-ROUTER(cfg-crypto-trans)#end

SITE-B-ROUTER(config)#crypto ipsec transform-set TRANSF-SET esp-aes 256 esp-sha-hmac
SITE-B-ROUTER(cfg-crypto-trans)#end

查看配置的IPsec 转换集

SITE-A-ROUTER#show crypto ipsec transform-set
Transform set TRANSF-SET: { esp-256-aes esp-sha-hmac  }
   will negotiate = { Tunnel,  },
Transform set #$!default_transform_set_1: { esp-aes esp-sha-hmac  }
   will negotiate = { Transport,  },
Transform set #$!default_transform_set_0: { esp-3des esp-sha-hmac  }
   will negotiate = { Transport,  },

SITE-B-ROUTER#show crypto ipsec transform-set
Transform set TRANSF-SET: { esp-256-aes esp-sha-hmac  }
   will negotiate = { Tunnel,  },
Transform set #$!default_transform_set_1: { esp-aes esp-sha-hmac  }
   will negotiate = { Transport,  },
Transform set #$!default_transform_set_0: { esp-3des esp-sha-hmac  }
   will negotiate = { Transport,  },

配置IPsec安全关联生命周期

SITE-A-ROUTER(config)#crypto ipsec security-association lifetime seconds 1800
SITE-A-ROUTER(config)#exit

SITE-B-ROUTER(config)#crypto ipsec security-association lifetime seconds 1800
SITE-B-ROUTER(config)#end

查看配置的IPsec安全关联生命周期

SITE-A-ROUTER#show crypto ipsec security-association lifetime
Security association lifetime: 4608000 kilobytes/1800 seconds

SITE-B-ROUTER#show crypto ipsec security-association lifetime
Security association lifetime: 4608000 kilobytes/1800 seconds

配置加密映射

SITE-A-ROUTER(config)#crypto map CRYPTO-MAP 10 ipsec-isakmp
% NOTE: This new crypto map will remain disabled until a peer
        and a valid access list have been configured.

SITE-A-ROUTER(config-crypto-map)#match address important-traffic
SITE-A-ROUTER(config-crypto-map)#set peer 192.168.2.1
SITE-A-ROUTER(config-crypto-map)#set transform-set TRANSF-SET
SITE-A-ROUTER(config-crypto-map)#exit
SITE-A-ROUTER(config)#end

SITE-B-ROUTER(config)#crypto map CRYPTO-MAP 10 ipsec-isakmp
% NOTE: This new crypto map will remain disabled until a peer
        and a valid access list have been configured.

SITE-B-ROUTER(config-crypto-map)#match address important-traffic
SITE-B-ROUTER(config-crypto-map)#set peer 100.100.100.100
SITE-B-ROUTER(config-crypto-map)#set transform-set TRANSF-SET
SITE-B-ROUTER(config-crypto-map)#END

查看配置的加密映射

ITE-A-ROUTER#show crypto map
Crypto Map "CRYPTO-MAP" 10 ipsec-isakmp
        Peer = 192.168.2.1
        Extended IP access list important-traffic
            access-list important-traffic permit ip 192.168.10.0 0.0.0.255 192.168.20.0 0.0.0.255
        Security association lifetime: 4608000 kilobytes/1800 seconds
        Responder-Only (Y/N): N
        PFS (Y/N): N
        Transform sets={
                TRANSF-SET:  { esp-256-aes esp-sha-hmac  } ,
        }
        Interfaces using crypto map CRYPTO-MAP:

SITE-B-ROUTER#show crypto map
Crypto Map "CRYPTO-MAP" 10 ipsec-isakmp
        Peer = 192.168.1.1
        Extended IP access list important-traffic
            access-list important-traffic permit ip 192.168.20.0 0.0.0.255 192.168.10.0 0.0.0.255
        Security association lifetime: 4608000 kilobytes/1800 seconds
        Responder-Only (Y/N): N
        PFS (Y/N): N
        Transform sets={
                TRANSF-SET:  { esp-256-aes esp-sha-hmac  } ,
        }
        Interfaces using crypto map CRYPTO-MAP:

在接口上应用加密映射

SITE-A-ROUTER(config)#interface serial 4/0
SITE-A-ROUTER(config-if)#crypto map CRYPTO-MAP
SITE-A-ROUTER(config-if)#exit

SITE-B-ROUTER(config)#interface serial 4/1
SITE-B-ROUTER(config-if)#crypto map CRYPTO-MAP
SITE-B-ROUTER(config-if)#end

查看接口上的加密映射

SITE-B-ROUTER#show crypto map interface serial 4/1
Crypto Map "CRYPTO-MAP" 10 ipsec-isakmp
        Peer = 192.168.1.1
        Extended IP access list important-traffic
            access-list important-traffic permit ip 192.168.20.0 0.0.0.255 192.168.10.0 0.0.0.255
        Current peer: 192.168.1.1
        Security association lifetime: 4608000 kilobytes/1800 seconds
        Responder-Only (Y/N): N
        PFS (Y/N): N
        Transform sets={
                TRANSF-SET:  { esp-256-aes esp-sha-hmac  } ,
        }
        Interfaces using crypto map CRYPTO-MAP:
                Serial4/1

先ping测试下

SITE-A-ROUTER#ping 192.168.20.1 source fastEthernet 0/0 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 192.168.20.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.10.1
.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 99 percent (99/100), round-trip min/avg/max = 44/63/100 ms

SITE-A-ROUTER#show crypto ipsec sa
interface: Serial4/0
    Crypto map tag: CRYPTO-MAP, local addr 192.168.1.1
   protected vrf: (none)
   local  ident (addr/mask/prot/port): (192.168.10.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (192.168.20.0/255.255.255.0/0/0)
   current_peer 192.168.2.1 port 500
     PERMIT, flags={origin_is_acl,ipsec_sa_request_sent}
    #pkts encaps: 99, #pkts encrypt: 99, #pkts digest: 99
    #pkts decaps: 99, #pkts decrypt: 99, #pkts verify: 99
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #send errors 1, #recv errors 0
     local crypto endpt.: 192.168.1.1, remote crypto endpt.: 192.168.2.1
     path mtu 1500, ip mtu 1500, ip mtu idb Serial4/0
     current outbound spi: 0xFD7D51CD(4252848589)
     PFS (Y/N): N, DH group: none
     inbound esp sas:
      spi: 0x367632C(57107244)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 1, flow_id: SW:1, sibling_flags 80000046, crypto map: CRYPTO-MAP
        sa timing: remaining key lifetime (k/sec): (4546969/1781)
        IV size: 16 bytes
        replay detection support: Y
        Status: ACTIVE
     inbound ah sas:
     inbound pcp sas:
     outbound esp sas:
      spi: 0xFD7D51CD(4252848589)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 2, flow_id: SW:2, sibling_flags 80000046, crypto map: CRYPTO-MAP
        sa timing: remaining key lifetime (k/sec): (4546969/1781)
        IV size: 16 bytes
        replay detection support: Y
        Status: ACTIVE
     outbound ah sas:
     outbound pcp sas:

SITE-B-ROUTER#ping 192.168.10.1 source fastEthernet 0/0 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 192.168.10.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.20.1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 32/62/96 ms

SITE-B-ROUTER#show crypto ipsec sa
interface: Serial4/1
    Crypto map tag: CRYPTO-MAP, local addr 192.168.2.1
   protected vrf: (none)
   local  ident (addr/mask/prot/port): (192.168.20.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (192.168.10.0/255.255.255.0/0/0)
   current_peer 192.168.1.1 port 500
     PERMIT, flags={origin_is_acl,}
    #pkts encaps: 199, #pkts encrypt: 199, #pkts digest: 199
    #pkts decaps: 199, #pkts decrypt: 199, #pkts verify: 199
    #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.: 192.168.2.1, remote crypto endpt.: 192.168.1.1
     path mtu 1500, ip mtu 1500, ip mtu idb Serial4/1
     current outbound spi: 0x367632C(57107244)
     PFS (Y/N): N, DH group: none
     inbound esp sas:
      spi: 0xFD7D51CD(4252848589)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 1, flow_id: SW:1, sibling_flags 80000046, crypto map: CRYPTO-MAP
        sa timing: remaining key lifetime (k/sec): (4383954/1725)
        IV size: 16 bytes
        replay detection support: Y
        Status: ACTIVE
     inbound ah sas:
     inbound pcp sas:
     outbound esp sas:
      spi: 0x367632C(57107244)
        transform: esp-256-aes esp-sha-hmac ,
        in use settings ={Tunnel, }
        conn id: 2, flow_id: SW:2, sibling_flags 80000046, crypto map: CRYPTO-MAP
        sa timing: remaining key lifetime (k/sec): (4383954/1725)
        IV size: 16 bytes
        replay detection support: Y
        Status: ACTIVE
     outbound ah sas:
     outbound pcp sas:

在R3上配置IP静态NAT

Internet-NAT-Device(config)#ip nat inside source static 192.168.1.1 100.100.100.100

在R3上配置内部和外部NAT

Internet-NAT-Device(config)#interface serial 4/0
Internet-NAT-Device(config-if)#ip nat inside
Internet-NAT-Device(config-if)#exit

Internet-NAT-Device(config)#interface serial 4/1
Internet-NAT-Device(config-if)#ip nat outside
Internet-NAT-Device(config-if)#exit

确保 192.168.10.1 可以通过 IPsec 到达 192.168.20.1，并将 IP 转换为 100.100.100.100

SITE-A-ROUTER#clear crypto isakmp
SITE-A-ROUTER#clear crypto session

SITE-A-ROUTER#ping 192.168.20.1 source fastEthernet 0/0 repeat 1000

Type escape sequence to abort.
Sending 1000, 100-byte ICMP Echos to 192.168.20.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.10.1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (1000/1000), round-trip min/avg/max = 44/60/140 ms

SITE-B-ROUTER#ping 192.168.10.1 source fastEthernet 0/0 repeat 1000

Type escape sequence to abort.
Sending 1000, 100-byte ICMP Echos to 192.168.10.1, timeout is 2 seconds:
Packet sent with a source address of 192.168.20.1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (1000/1000), round-trip min/avg/max = 24/60/144 ms              ---

Internet-NAT-Device#show ip nat translations
Pro          Inside global      Inside local       Outside local      Outside global
udp 100.100.100.100:4500 192.168.1.1:4500 192.168.2.1:4500   192.168.2.1:4500
--- 100.100.100.100    192.168.1.1        ---                ---

SITE-A-ROUTER#show crypto ipsec sa

interface: Serial4/0
    Crypto map tag: CRYPTO-MAP, local addr 192.168.1.1

   protected vrf: (none)
   local  ident (addr/mask/prot/port): (192.168.10.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (192.168.20.0/255.255.255.0/0/0)
   current_peer 192.168.2.1 port 4500
     PERMIT, flags={origin_is_acl,}
    #pkts encaps: 2219, #pkts encrypt: 2219, #pkts digest: 2219
    #pkts decaps: 2219, #pkts decrypt: 2219, #pkts verify: 2219
    #pkts compressed: 0, #pkts decompressed: 0
    #pkts not compressed: 0, #pkts compr. failed: 0
    #pkts not decompressed: 0, #pkts decompress failed: 0
    #send errors 1, #recv errors 0

     local crypto endpt.: 192.168.1.1, remote crypto endpt.: 192.168.2.1
     path mtu 1500, ip mtu 1500, ip mtu idb Serial4/0
     current outbound spi: 0x3BD9F3C0(1004139456)
     PFS (Y/N): N, DH group: none

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原始发表：2024-03-26，如有侵权请联系 cloudcommunity@tencent.com 删除

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