MSR36与MSR2011 ipsec建立失败问题

MSR3610设备作为总部和多个分支MSR2011设备建立野蛮模式ipsec vpn，

设备信息：MSR3610 R0707P19版本 MSR2011 2207P02版本

问题描述： MSR3610设备作为总部和多个分支MSR2011设备建立野蛮模式ipsec vpn，其中一个分支起不来，MSR2011侧有配置NAT穿越，分支侧只有ike sa，没有ipsec sa，总部侧没有ike sa。

总部配置：

ipsec transform-set 1

 esp encryption-algorithm des-cbc

 esp authentication-algorithm md5

#           

ipsec policy-template zongbu 2

 transform-set 1

 local-address 60.28.52.XX

 remote-address hbfenbu1

 ike-profile 2

#

ipsec policy vanguard 1 isakmp template zongbu

#

 ike identity fqdn hbcenter

#

ike profile 2

 keychain 2

 local-identity address 60.28.52.XX

 match remote identity fqdn hbfenbu1

 proposal 1

#

ike proposal 1

#

ike keychain 2

 pre-shared-key hostname hbfenbu1 key cipher $c$3$V5sVOrjKJEpq7NrcneqocOzpXvH58H+kTFDs

#

分部配置：

ike proposal 1

#

ike peer hbfenbu1

 exchange-mode aggressive

 pre-shared-key simple hbcenter

 id-type name

 remote-name hbcenter

 remote-address 60.28.52.XX

 local-name hbfenbu1

 nat traversal

#

ipsec proposal 1

#

ipsec policy hbfenbu1 1 isakmp

 security acl 3002

 ike-peer hbfenbu1

 proposal 1

[MSR20]dis ike sa

    total phase-1 SAs:  1

    connection-id  peer            flag        phase   doi

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

     4708          60.28.52.XX    RD|ST         1     IPSEC

[MSR20]dis ipsec sa

[MSR20]

Debug ike all查看当前协商过程，发现是中间运营商侧（以前遇到过类似问题）将第一阶段第三个报文端口号是4500的源地址又给转换成了新的公网地址（114.250.82.XX），导致第二阶段的协商的时候，防火墙侧依旧是把第二阶段报文回复给了（123.118.61.XX）导致，第二阶段协商不起来。

*Sep 18 01:57:10:284 2020 H3C12345 IKE/7/PACKET: vrf = 0, local = 60.28.52.XX, remote = 123.118.61.XX/4500

Received packet from 123.118.61.XX source port 4500 destination port 4500.

*Sep 18 01:57:10:284 2020 H3C12345 IKE/7/PACKET: vrf = 0, local = 60.28.52.XX, remote = 123.118.61.XX/4500

  I-COOKIE: 5c46f48afd838c70

  R-COOKIE: bb2beba2aade1138

  next payload: HASH

  version: ISAKMP Version 1.0

  exchange mode: Quick

  flags: ENCRYPT

  message ID: 9100d3e9

  length: 172

*Sep 18 01:57:10:284 2020 H3C12345 IKE/7/EVENT: IKE thread 1099234726576 processes a job.

*Sep 18 01:57:10:285 2020 H3C12345 IKE/7/EVENT: Phase2 process started.

*Sep 18 01:57:10:285 2020 H3C12345 IKE/7/EVENT: vrf = 0, local = 60.28.52.XX, remote = 114.250.82.XX/4500

Set IPsec SA state to IKE_P2_STATE_INIT.

*Sep 18 01:57:10:285 2020 H3C12345 IKE/7/PACKET: vrf = 0, local = 60.28.52.XX, remote = 114.250.82.XX/4500

Decrypt the packet.

R0809P28版本可以兼容这种特殊运营商，ike第二条4500端口的流穿越nat时改变公网地址的情况。也可以将MSR36设备升级到R0809P28版本后问题解决。