Browsing Over Subnets

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Browsing Over Subnets

Within Windows NT, every local subnet, a collection of computers separated by a router, is its own browsing area. This browsing area is complete with its own Master Browser and Backup Browsers. Subnets hold Browser elections, for their own subnet, which demonstrates the need for a Domain Master Browser if you have multiple subnets on your internetwork to allow for browsing over more than just one subnet. Additionally, each subnet needs at least one Windows NT controller in each subnet to register with the Domain Master Browser. This allows for multi-subnet browsing.

Generally, broadcasts do not go through a router; the router needs to be BOOTP-enabled to allow passing of broadcasts. If a domain has multiple subnets, each Master Browser for each subnet uses a directed datagram called a MasterBrowserAnnouncement. The MasterBrowserAnnouncement lets the Domain Master Browser know it is available and what it has on its subnet list. These datagrams pass through the routers enabling these updates to occur. The Domain Master Browser adds all the subnet Master Browser lists to its own browse list, providing a complete browse list of the entire domain, including all subnets. This process occurs every 15 minutes to ensure regular list updates. The timing is not adjustable. Windows NT workgroups and Windows for Workgroups are not able to send a MasterBrowserAnnouncement packet and therefore cannot span these multiple subnets or have a complete list—thus the need for Windows NT domain controllers to allow for multiple subnet browsing. Figure 10.8 illustrates what browsing over subnets might look like in a network design.

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