MSR为V7版本不直连公网,在NAT设备之后且公网出口地址为拨号出口;V5的防火墙F1000公网地址固定。
拓扑:MSR3600----》TP-link路由器----》NAT路由器------》Internet------》防火墙
MSR和F1000上查看ike和ipsec信息均无,无法正常建立ipsec隧道
1、防火墙debug ike信息(没有收到任何ike协商的数据包):
*Nov 25 16:54:47:661 2015 LSSH-F1000-S-AI DPIPSEC/7/debug:
IPsec_Packet: thread 0, Outbound packets should not be protected by IPsec.
*Nov 25 16:54:48:892 2015 LSSH-F1000-S-AI DPIPSEC/7/debug:
IPsec_Packet: thread 0, Outbound packets should not be protected by IPsec.
*Nov 25 16:54:55:731 2015 LSSH-F1000-S-AI DPIPSEC/7/debug:
IPsec_Packet: thread 0, Outbound packets should not be protected by IPsec.
*Nov 25 16:54:56:589 2015 LSSH-F1000-S-AI DPIPSEC/7/debug:
IPsec_Packet: thread 0, Outbound packets should not be protected by IPsec.
*Nov 25 16:55:05:270 2015 LSSH-F1000-S-AI DPIPSEC/7/debug:
IPsec_Packet: thread 0, Outbound packets should not be protected by IPsec.
2、MSR上debug ike信息,有主动发起协商的报文
3、MSR和F1000上查看ike和ipsec信息均无
1、防火墙端正常,经过测试可以和其他设备正常建立ipsec隧道
2、从MSR出口端抓包确认有UDP端口为500和4500的数据包
3、在和TP-LINK相连的出口设备上抓包,确认没有收到任何UDP端口为4500和500的数据包
4、通过抓包确认IKE协商包被TP-LINK丢弃了
1、将网络中的TP-LINK家用路由器去掉,MSR36直接和NAT出口设备相连
2、经过测试可以正常建立IPSEC隧道链接
3、MSR上的display信息如下
Connection-ID Remote Flag DOI
------------------------------------------------------------------
1 118.119.250.10 RD IPSEC
-------------------------------
Interface: GigabitEthernet0/0
-------------------------------
-----------------------------
IPsec policy: 1
Sequence number: 1
Mode: isakmp
-----------------------------
Tunnel id: 0
Encapsulation mode: tunnel
Perfect forward secrecy:
Path MTU: 1419
Tunnel:
local address: 192.168.48.190
remote address: 118.119.250.10
Flow:
sour addr: 192.168.128.0/255.255.255.0 port: 0 protocol: ip
dest addr: 192.168.1.0/255.255.255.0 port: 0 protocol: ip
[Inbound ESP SAs]
SPI: 520906101 (0x1f0c6575)
Transform set: ESP-ENCRYPT-AES-CBC-128 ESP-AUTH-MD5
SA duration (kilobytes/sec): 1843200/3600
SA remaining duration (kilobytes/sec): 1843199/3445
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: 3869704040 (0xe6a6ff68)
Transform set: ESP-ENCRYPT-AES-CBC-128 ESP-AUTH-MD5
SA duration (kilobytes/sec): 1843200/3600
SA remaining duration (kilobytes/sec): 1843199/3445
Max sent sequence-number: 4
UDP encapsulation used for NAT traversal: Y
Status: active
1、很多家用路由器因为性能限制无法承载IKE协商数据报文,故直接丢弃了IKE报文,建议IPSEC的网络中出现无法IKE协商的时候将家用级别的路由器去掉测试
2、V5和V7对接,只需要根据设备对应的所在网络环境进行对应版本的配置即可,保持V5和V7需要协商的参数一致即可
3、如果V5端的设备出口地址不是固定的,需要通过服务模板去配置IPSEC,否则无法建立隧道
4、附件中有本次问题的MSR和防火墙的配置,供对接时参考使用
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