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IPSec VPN主模式NAT穿越(中间有设备作NAT Server映射内网地址)

2021-11-15 发表
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组网及说明


注:如无特别说明,描述中的 FW1 或 MSR1 对应拓扑中设备名称末尾数字为 1 的设备,FW2 或 MSR2 对应拓扑中设备名称末尾数字为 2 的设备,以此类推;另外,同一网段中,IP 地址的主机位为其设备编号,如 FW1 的 g0/0 接口若在 1.1.1.0/24 网段,则其 IP 地址为 1.1.1.1/24,以此类推

**************************************************************************************************************************************************

实验需求:

1.MSR2接口作nat server 映射内网地址10.2.2.1.

2.FW1和FW3建立IPsec隧道,涉及nat穿越.

3.不涉及安全域和安全策略

配置步骤

主要配置:


FW1:

#

interface LoopBack0

 ip address 10.1.1.1 255.255.255.0

#

interface GigabitEthernet1/0/0

 port link-mode route

 combo enable copper

 ip address 1.1.1.1 255.255.255.0

 ipsec apply policy ply

#

 ip route-static 10.2.2.0 24 1.1.1.2

#

acl advanced 3000

 rule 0 permit ip source 10.1.1.0 0.0.0.255 destination 10.2.2.0 0.0.0.255

#

ipsec transform-set ts

 esp encryption-algorithm aes-cbc-128

 esp authentication-algorithm md5

#

ipsec policy ply 1 isakmp

 transform-set ts

 security acl 3000

 local-address 1.1.1.1

 remote-address 1.1.1.2

 ike-profile pf

#

ike profile pf

 keychain key

 local-identity address 1.1.1.1

 match remote identity address 1.1.1.2 255.255.255.255

 proposal 1

#

ike proposal 1

#

ike keychain key

 pre-shared-key address 1.1.1.2 255.255.255.255 key cipher $c$3$7tR4Xas8kMaW0BNkLtmL6SYAzYgdWUGDxw==


MSR2:

#

interface GigabitEthernet0/0

 port link-mode route

 combo enable copper

 ip address 1.1.1.2 255.255.255.0

 nat server global 1.1.1.2 inside 192.168.1.3

#

interface GigabitEthernet0/1

 port link-mode route

 combo enable copper

 ip address 192.168.1.2 255.255.255.0

 

FW3:

#

interface LoopBack0

 ip address 10.2.2.1 255.255.255.0

#

interface GigabitEthernet1/0/0

 port link-mode route

 combo enable copper

 ip address 192.168.1.3 255.255.255.0

 ipsec apply policy ply

#

 ip route-static 1.1.1.0 24 192.168.1.2

 ip route-static 10.1.1.0 24 192.168.1.2

#

acl advanced 3000

 rule 0 permit ip source 10.2.2.0 0.0.0.255 destination 10.1.1.0 0.0.0.255

#

ipsec transform-set ts

 esp encryption-algorithm aes-cbc-128

 esp authentication-algorithm md5

#

ipsec policy ply 1 isakmp

 transform-set ts

 security acl 3000

 local-address 192.168.1.3

 remote-address 1.1.1.1

 ike-profile pf

#

ike profile pf

 keychain key

 local-identity address 192.168.1.3

 match remote identity address 1.1.1.1 255.255.255.255

 proposal 1

#

ike proposal 1

#

ike keychain key

 pre-shared-key address 1.1.1.1 255.255.255.255 key cipher $c$3$OjYKsJVs/Q5wvdk9KNkK+aVUephZo6hZjQ==


 验证:

FW1:

<H3C>ping -a 10.1.1.1 10.2.2.1

Ping 10.2.2.1 (10.2.2.1) from 10.1.1.1: 56 data bytes, press CTRL_C to break

Request time out

56 bytes from 10.2.2.1: icmp_seq=1 ttl=255 time=1.000 ms

56 bytes from 10.2.2.1: icmp_seq=2 ttl=255 time=1.000 ms

56 bytes from 10.2.2.1: icmp_seq=3 ttl=255 time=1.000 ms

56 bytes from 10.2.2.1: icmp_seq=4 ttl=255 time=1.000 ms

 

--- Ping statistics for 10.2.2.1 ---

5 packet(s) transmitted, 4 packet(s) received, 20.0% packet loss

round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms

<H3C>%Nov  4 21:27:03:783 2021 H3C PING/6/PING_STATISTICS: -COntext=1; Ping statistics for 10.2.2.1: 5 packet(s) transmitted, 4 packet(s) received, 20.0% packet loss, round-trip min/avg/max/std-dev = 1.000/1.000/1.000/0.000 ms.


<H3C>dis ike sa

    Connection-ID   Remote                Flag         DOI   

------------------------------------------------------------------

    1               1.1.1.2               RD           IPsec 

Flags:

RD--READY RL--REPLACED FD-FADING RK-REKEY


<H3C>dis ipsec sa

-------------------------------

Interface: GigabitEthernet1/0/0

-------------------------------

 

  -----------------------------

  IPsec policy: ply

  Sequence number: 1

  Mode: ISAKMP

  -----------------------------

    Tunnel id: 0

    Encapsulation mode: tunnel

    Perfect Forward Secrecy:

    Inside VPN:

    Extended Sequence Numbers enable: N

    Traffic Flow Confidentiality enable: N

    Path MTU: 1420

    Tunnel:

        local  address: 1.1.1.1

        remote address: 1.1.1.2

    Flow:

        sour addr: 10.1.1.0/255.255.255.0  port: 0  protocol: ip

        dest addr: 10.2.2.0/255.255.255.0  port: 0  protocol: ip

 

    [Inbound ESP SAs]

      SPI: 1747129064 (0x682312e8)

      Connection ID: 4294967296

      Transform set: ESP-ENCRYPT-AES-CBC-128 ESP-AUTH-MD5

      SA duration (kilobytes/sec): 1843200/3600

      SA remaining duration (kilobytes/sec): 1843199/3513

      Max received sequence-number: 4

      Anti-replay check enable: Y

      Anti-replay window size: 64

      UDP encapsulation used for NAT traversal: Y

      Status: Active

 

    [Outbound ESP SAs]

      SPI: 2898882926 (0xacc9716e)

      Connection ID: 4294967297

      Transform set: ESP-ENCRYPT-AES-CBC-128 ESP-AUTH-MD5

      SA duration (kilobytes/sec): 1843200/3600

      SA remaining duration (kilobytes/sec): 1843199/3513

      Max sent sequence-number: 4

      UDP encapsulation used for NAT traversal: Y

      Status: Active


查看会话:


FW1:

<H3C>dis session ta ipv4 v

Slot 1:

Initiator:

  Source      IP/port: 1.1.1.1/4500

  Destination IP/port: 1.1.1.2/4500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: InLoopBack0

  Source security zone: Local

Responder:

  Source      IP/port: 1.1.1.2/4500

  Destination IP/port: 1.1.1.1/4500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet1/0/0

  Source security zone: Untrust

State: UDP_READY

Application: GENERAL_UDP

Rule ID: 0

Rule name: any

Start time: 2021-11-04 21:27:00  TTL: 50s

Initiator->Responder:            7 packets       1052 bytes

Responder->Initiator:           30 packets       1509 bytes

 

Initiator:

  Source      IP/port: 1.1.1.1/500

  Destination IP/port: 1.1.1.2/500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: InLoopBack0

  Source security zone: Local

Responder:

  Source      IP/port: 1.1.1.2/500

  Destination IP/port: 1.1.1.1/500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet1/0/0

  Source security zone: Untrust

State: UDP_READY

Application: ISAKMP

Rule ID: 0

Rule name: any

Start time: 2021-11-04 21:27:00  TTL: 753s

Initiator->Responder:            2 packets        468 bytes

Responder->Initiator:            2 packets        408 bytes


MSR2:

<H3C>dis nat session v

Slot 0:

Initiator:

  Source      IP/port: 1.1.1.1/4500

  Destination IP/port: 1.1.1.2/4500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet0/0

Responder:

  Source      IP/port: 192.168.1.3/4500

  Destination IP/port: 1.1.1.1/4500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet0/1

State: UDP_READY

Application: GENERAL_UDP

Rule ID: -/-/-

Rule name:

Start time: 2021-11-04 21:28:30  TTL: 40s

Initiator->Responder:            7 packets       1052 bytes

Responder->Initiator:           35 packets       1785 bytes

 

Initiator:    

  Source      IP/port: 1.1.1.1/500

  Destination IP/port: 1.1.1.2/500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet0/0

Responder:

  Source      IP/port: 192.168.1.3/500

  Destination IP/port: 1.1.1.1/500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet0/1

State: UDP_READY

Application: ISAKMP

Rule ID: -/-/-

Rule name:

Start time: 2021-11-04 21:28:30  TTL: 620s

Initiator->Responder:            2 packets        468 bytes

Responder->Initiator:            2 packets        408 bytes

 

Total sessions found: 2


FW3:

<H3C>dis session ta ipv4 v

Slot 1:

Initiator:

  Source      IP/port: 1.1.1.1/4500

  Destination IP/port: 192.168.1.3/4500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet1/0/0

  Source security zone: Trust

Responder:

  Source      IP/port: 192.168.1.3/4500

  Destination IP/port: 1.1.1.1/4500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: InLoopBack0

  Source security zone: Local

State: UDP_READY

Application: GENERAL_UDP

Rule ID: 0

Rule name: any

Start time: 2021-11-04 21:28:30  TTL: 47s

Initiator->Responder:            6 packets        892 bytes

Responder->Initiator:           39 packets       1901 bytes

 

Initiator:

  Source      IP/port: 1.1.1.1/500

  Destination IP/port: 192.168.1.3/500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: GigabitEthernet1/0/0

  Source security zone: Trust

Responder:

  Source      IP/port: 192.168.1.3/500

  Destination IP/port: 1.1.1.1/500

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: UDP(17)

  Inbound interface: InLoopBack0

  Source security zone: Local

State: UDP_READY

Application: ISAKMP

Rule ID: 0

Rule name: any

Start time: 2021-11-04 21:28:30  TTL: 547s

Initiator->Responder:            2 packets        468 bytes

Responder->Initiator:            2 packets        408 bytes

 

Total sessions found: 2

配置关键点

触发需要公网一侧,因为内网测无法找到对端.

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