ipsec主模式两端可以使用nat穿越吗

客户2台做ipsec vpn的设备，一台设备在公网，已经有ipsec 配置，现今在某分支内部有需求加入一台ipsec vpn设备与总部的ipsec主模式建立连接，但总部设备无法申请到配置变更时间窗口。拓扑图如下。

主模式能否通过nat的网络环境建立ipsec连接？

总部ipsec 相关配置：

 #

 ipsec transform-set 1

 esp encryption-algorithm 3des-cbc 

 esp authentication-algorithm sha1 

# 

ipsec policy-template zhou 1 transform-set 1 ike-profile 1

 #

 ipsec policy h3c 1 isakmp template zhou

 # 

ike profile 1 keychain 1 match remote identity address 0.0.0.0 0.0.0.0 proposal 1

 # 

ike proposal 1 encryption-algorithm 3des-cbc authentication-algorithm md5 

#

 ike keychain 1 pre-shared-key address 0.0.0.0 0.0.0.0 key cipher $c$3$T1l9qJ8+TCAB1xIrhB9H0G7tm1vReA== # return 

分支ipsec 配置：

#

 ipsec transform-set 1 esp encryption-algorithm 3des-cbc esp authentication-algorithm sha1

 # 

ipsec policy h3c 1 isakmp transform-set 1 security acl 3000 remote-address 10.1.1.1 ike-profile 1

 # 

ike profile 1 keychain 1 match remote identity address 10.1.1.1 0.0.0.0 proposal 1 

#

 ike proposal 1 encryption-algorithm 3des-cbc authentication-algorithm md5 

#

 ike keychain 1 pre-shared-key address 10.1.1.1 0.0.0.0 key cipher $c$3$1W4lciAT88WpcGZZRrvznvcvPgFKFQ== 

#

 return

ping测试：

[H3C]PING -a 4.4.4.4 1.1.1.1 Ping 1.1.1.1 (1.1.1.1)

 from 4.4.4.4: 56 data bytes, press CTRL+C to break Request time out 56 bytes

 from 1.1.1.1: icmp_seq=1 ttl=255 time=5.787 ms 56 bytes 

from 1.1.1.1: icmp_seq=2 ttl=255 time=5.744 ms 56 bytes

 from 1.1.1.1: icmp_seq=3 ttl=255 time=4.478 ms 56 bytes

 from 1.1.1.1: icmp_seq=4 ttl=255 time=4.510 ms --- 

Ping statistics for 1.1.1.1 --- 5 packet(s) transmitted, 4 packet(s) received, 20.0% packet loss