Saturday, September 18, 2010

NetBIOS Session Service

This is quite straightforward when all NBT nodes are of same type. Strange thing will happen when mixing node type, especially on a routed environment.

P & B - The B nodes will only see other B nodes and P nodes will only see other P nodes using the same WINS server. In other words, separate VLANs are created.

P & M - M nodes peform all the function of a P node, including registering their names with WINS. All P nodes can see all M nodes, though M nodes on the same wire can bypass WINS when resolving names.

B & M - On a signle, non-routed environment, all M nodes behave like B nodes and perform registration and name resolution via broadcast mechanism, making use of WINS pointles. In a routed environment, B nides on one subnet will not able to see any node on other subnet, M nodes will see all other M nodes but only B nodes on their local subnet. A potential problem is name collision, of which a B node may register a name that is already exist in the WINS databsae, and an M node jught register a name that one or more nodes on remote subnets.

P, B & M - The P nodes can see all of the M nodes which can see some of th eB nodes which cannot see any P nodes at all. The situation becomes worse.

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