Configuring Replication Partners

When you have two or more WINS servers on a network, you should configure replication between them. When servers replicate database entries with each other, they are said to be replication partners.

Replication Essentials

There are two replication roles for WINS servers:

  • Push partner A push partner is a replication partner that notifies other WINS servers that updates are available.

  • Pull partner A pull partner is a replication partner that requests updates.

By default, all WINS servers have replication enabled and replication partners are configured to use both push and pull replication. After a replication partner notifies a partner that there are changes using push replication, the partner can request the changes using pull replication. This pulls the changes down to its WINS database. In addition, all replication is done using persistent connections by default to increase efficiency.

Because replication is automatically enabled and configured, all you have to do to start replication is tell each WINS server about the other WINS servers that are available. On a small network, you can do this using the automatic replication partners feature. Because this can cause a lot of broadcast traffic on medium or large networks that contain many clients and servers, you'll probably want to designate specific replication partners to reduce broadcast traffic.

Configuring Automatic Replication Partners

To configure automatic replication partners, follow these steps:

  1. Start the WINS console. Right-click the WINS node in the left pane, and select Add Server. In the Add Server dialog box, select This Server, type the name or IP address of the WINS server, and then click OK.

  2. Expand the server entry, right-click the Replication Partners entry in the left pane, and then select Properties. In the Replication Partners Properties dialog box, select the Advanced tab, as shown in Figure 28-2.

    Enable automatic replication.

    Figure 28-2. Enable automatic replication.

  3. Select Enable Automatic Partner Configuration.

  4. Use the Multicast Interval options to set the interval between multicast broadcasts to the WINS server group address. These broadcasts are used to tell other WINS servers about the availability of the server you are configuring. The default interval is 40 minutes.

    Tip

    Registrations remain until restart

    Once a server is discovered and added as a partner through multicasting, the server remains as a configured partner until you restart the WINS service or until you restart the server. When WINS is shut down properly, part of the shutdown process is to send messages to current replication partners and remove its registration.

  5. Use the Multicast Time To Live (TTL) combo box to specify how many links multicast broadcasts can go through before being discarded. The default is 2, which would allow the broadcasts to be relayed through two routers.

  6. Click OK.

Tip

Multicast through routers is possible

The TTL is used to allow the discovery broadcasts to be routed between subnets. This means you could use automatic replication partners on networks with subnets. However, routing isn't automatic just because a datagram has a TTL. You must configure the routers on each subnet to forward multicast traffic received from the WINS multicast group address (224.0.1.24).

Using Designated Replication Partners

To designate specific replication partners, start the WINS console. Right-click the WINS node in the left pane, and select Add Server. In the Add Server dialog box, select This Server, type the name or IP address of the WINS server, and then click OK.

Right-click the Replication Partners entry in the left pane, and select New Replication Partners. In the New Replication Partners dialog box, type the name or IP address of the WINS server that should be used as a replication partner, and then click OK. The replication partner is added and listed as available in the WINS console. As shown in Figure 28-3, replication partners are listed by server name, IP address, and replication type.

View replication partners in the WINS console.

Figure 28-3. View replication partners in the WINS console.

By default, the replication partner is configured to use both push and pull replication as well as persistent connections. Once you configure a replication partner, the configuration is permanent. If you restart a server, you do not need to reconfigure replication partners.

To view or change the replication settings for a replication partner, start the WINS console. Expand the server entry for the server you want to work with, and then select the Replication Partners entry in the left pane. Double-click the replication partner in the details pane. This displays the replication partner's Properties dialog box. Click the Advanced tab, as shown in Figure 28-4.

Configure replication partner settings.

Figure 28-4. Configure replication partner settings.

The configuration options are used as follows:

  • Replication Partner Type—Sets the replication type as push, pull, or push/pull.

  • Pull Replication

    • Use Persistent Connection For Replication—Configures pull replication so a persistent connection is used. This reduces the time spent opening and closing connections and improves performance.

    • Start Time—Sets the hour of the day when replication should begin using a 24-hour clock.

    • Replication Interval—Sets the frequency of replication. The default is every 30 minutes.

  • Push Replication

    • Use Persistent Connection For Replication—Configures push replication so a persistent connection is used. This reduces the time spent opening and closing connections and improves performance.

    • Number Of Changes In Version ID Before Replication—Can be used to limit replication by allowing replication to occur only when a set number of changes have occurred in the local WINS database.

Note

By default Number Of Changes In Version ID Before Replication is set to 0, which allows replication at the designated interval whenever there are changes. If you set a specific value, that many changes must occur before replication takes place.

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