局域网内win7的机器无法通过机器名访问其他机器

一台装了win7的机器，原本可以通过机器名访问局域网内的其他机器，后来突然不能通过机器名访问，仅能通过IP访问。

排除防火墙设定，NetBIOS使能问题后，发现导致该问题产生的原因是NetBIOS的Node Type不对。使用ipconfig/all命令检查网络设定，出现问题的机器，其NodeType为Peer-Peer（对等），而正常的机器NodeType为Hybrid。

NetBIOS是将NetBIOS名字解析为IP的协议。NetBIOS的NodeType决定了具体的解析方法。

• B-node (broadcast): it uses broadcasts for name resolution and registration. In a large network, a broadcast increases the network’s load. In addition, routers usually stop all broadcasts to forward, so only computers within the local network will respond. 即仅通过广播的方式解析。
• P-node (peer-to-peer): it uses a NetBIOS name server such as WINS to resolve NetBIOS names. P-node does not work with broadcasts because it directly queries the name server, enabling computers to resolve NetBIOS names across routers. P-node requires all computers to be configured with the NetBIOS name server IP address. If the NetBIOS name server is not functioning, computers will not be able to communicate. 即仅通过NetBIOS服务器（如WINS）的方式解析。
• M-node (mixed): combines B-node and P-node, but functions as B-node by default. If M-node cannot resolve name using broadcast, then it uses the NetBIOS name server P-node. 即先广播，再使用NetBIOS服务器的方式解析。
• H-node (hybrid): combines P-node and B-node, but functions as P-node by default. If H-node cannot resolve a name with a NetBIOS name server, then a name broadcast is used. 即先使用NetBIOS服务器，再广播的方式解析。

由于没有NetBIOS服务器，当使用Peer-Peer时，解析就会失败。

处理方法：

Click Start, click Run, type regedit, and then click OK.

Locate and then click the following registry subkey:

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NetBt\Parameters

In the right pane of Registry Editor, delete the following values if they are present:

  NodeType
  DhcpNodeType

Quit Registry Editor.

Restart the computer.

参考http://support.microsoft.com/kb/903267/en-us