ipsec安装好后运行ipsec verify命令发现错误的解决方案

Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path                                 [OK]
Linux Openswan U2.6.33/K3.0.18-x86_64-linode24 (netkey)
Checking for IPsec support in kernel                            [OK]
 SAref kernel support                                           [N/A]
 NETKEY:  Testing XFRM related proc values                      [OK]
        [OK]
        [OK]
Checking that pluto is running                                  [OK]
 Pluto listening for IKE on udp 500                             [OK]
 Pluto listening for NAT-T on udp 4500                          [OK]
Two or more interfaces found, checking IP forwarding            [OK]
Checking NAT and MASQUERADEing
Checking for 'ip' command                                       [OK]
Checking /bin/sh is not /bin/dash                               [OK]
Checking for 'iptables' command                                 [OK]
Opportunistic Encryption Support                                [DISABLED]

这样的状态就是正常的了、已经通过了验证

==========================================

如果迩发现这行是WARNING的话

Checking /bin/sh is not /bin/dash                               [WARNING]

因为ubtuntu和debian系统已经使用dash来代替bash脚本执行器、虽然dash更快更方便、但在某些脚本兼容性上还是不太稳定、莪们可以将ubuntu默认的脚本执行方式改回bash来执行、执行以下命令

sudo dpkg-reconfigure dash

按英文提示、选择no、就可以把dash切换成bash、再执行ipsec verify就不会出现WARNING的提示了

=========================================

Pluto listening for IKE on udp 500                              [FAILED]
  Cannot execute command "lsof -i UDP:500": No such file or directory
Pluto listening for NAT-T on udp 4500                           [FAILED]
  Cannot execute command "lsof -i UDP:4500": No such file or directory

如果出现以上的问题、就是没安装lsof的命令啦、安装就可以了

apt-get install lsof