在测试的时候发现用host成功，用ip失败； 都是同一台主机；难道走的协议不一样：
In the early days (Windows 2000, XP and 2003) it was possible to configure Service Principals Names (SPNs) with IP addresses. And then in Windows Vista and Windows Server 2008 it was removed in the Kerberos client and IP addresses on services didn’t work. Since then if a client tries to connect to e.g. a share by its IP address it would fall back to NTLM
windows高版本的ip默认ntlm认证了，用host才使用kerberos认证。（可以通过配置支持ip使用kerberos协议）