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Figure 9.3: Samba as local master browser
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Domain Master and Cross-Subnet Browsing
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Cross-subnet browsing provides a mechanism for unifying share lists in a domain or workgroup that would otherwise have been fragmented due to broadcast barriers between subnets. To enable browsing over subnet boundaries you'll need a system to act as the domain master browser and a WINS server to identify it to the local master servers on each subnet. Remember that WINS uses point-to-point communications not usually blocked by routers. To make Samba a WINS server, enable the wins support parameter and verify that the wins server parameter is disabled. These parameters are mutually exclusive. Refer to 8, "Name Service," for additional information related to using Samba in a WINS environment. wins support = yes To point Samba at a remote WINS server, set the value wins server parameter to the IP address or DNS name of the WINS server:
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wins server = <IP address or DNS name> Next you will need a system operating as the domain master browser to collect and synchronize the browse lists from the various local master browsers (Figure 9.4). The domain master can be either a Samba server or an NT domain PDC, but not both. Remember that an NT domain PDC is automatically designated as the domain master browser.
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Figure 9.4: Domain master browser, multi-subnet configuration
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To make Samba the domain master, enable the domain master, local master, and preferred master parameters. Set the os level parameter to '65' to exceed the value of all other systems in the workgroup. domain master = yes local master = yes preferred master = yes os level = 65 If you already have a Windows NT PDC serving the domain make certain that Samba's domain master parameter is disabled: domain master = no
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In some instances you may need to force announcements or browse list synchronization between subnets for topologies that don't quite fall into the configurations we've examined thus far. There are any number of reasons for doing this, but note that the capability is not available in a native Windows environment. You can force Samba server announcements to traverse subnet boundaries by using the remote announce parameter. The value of the parameter is a list of remote subnet local master browser IP addresses that are the targets for announcements. An arbitrary workgroup name can be matched with each IP address to indicate the workgroup name Samba will use for each subnet (Figure 9.5). If the workgroup name is omitted, the value of the global workgroup parameter will be used: remote announce = <IP address list or IP/WORKGROUP list>
Figure 9.5: Remote announce configuration
You can also force browse list synchronization of designated remote subnet local master browsers with Samba using the remote browse sync parameter (Figure 9.6). Note that the set of local master browser services must all be running under Samba nmbd. This feature is not supported under Windows implementations. remote browse sync = <remote LMB IP address>
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Figure 9.6: Remote-browse sync configuration local master = yes preferred master = yes os level = 65
LAN Manager Browsing
If you need to support browsing for LAN Manager clients like OS/2, add the lm announce and lm interval parameters to smb.conf. A value of "auto" for lm announce will indicate that nmbd should listen for LAN Manager announcements and only respond when required. lm announce = <true, false, auto> lm interval = <seconds>
Problems
Like most distributed network servers, there are a number of things that can cause problems when incorporating Samba in a browsing environment. If things aren't working the way you expected, first check that the various smb.conf parameters are configured correctly. Next verify that you mapped the guest account parameter to a valid UNIX account for $IPC support. Check the nmbd.log for anomalies and error messages. Also verify that the argument list used with nmbd isn't too long and being truncated. Remove spaces between the argument and value to shorten the command length.
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Look at your network configuration. Make sure that you aren't blocking traffic at routers or network access points. If you have any Windows for Workgroups clients, don't use network broadcast addresses that include 0s. Also make sure that you don't have more than one protocol configured for any Windows master browser servers. Elections will occur over both protocols. If a server has both TCP and IPX protocols configured, and the server wins a local master browser election over its IPX channel, TCP browser communications with Samba will be effectively disabled. For more information regarding Samba browser configuration take a look at the BROWSING.txt and BROWSING-Config.txt distribution documents located in the samba-<version>/docs/textdocs directory.
Summary
Workgroup and domain clients view available shares via browser client tools that request browse lists from master browser servers. Master browsers for each subnet are elected based on OS level and desire from the set of machines capable of maintaining and serving browse lists. The election losers become backup browsers for availability purposes. Basic configuration required for Samba participation in a browser environment include designating the netbios name, workgroup name, announce as Windows operating system type, and the announce version. The guest account parameter must also map to a valid UNIX account for $IPC service. workgroup = <workgroup name> netbios name = <NetBIOS name> announce as = <NT, Win95, WfW> announce version = <version number> guest account = <UNIX account name> Samba's browser client or server roles are determined by the domain master and local master parameters. domain master = <yes, no> local master = <yes, no> Samba can influence the outcome of an election using the os level and preferred master parameters. preferred master = yes os level = 65 Cross-subnet browsing is enabled by designating a domain master browser to collate browse lists from remote subnet local master browsers. The domain master is identified via WINS service. Wins support = yes or
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wins server = <IP address or DNS name> Cross-subnet announcement and list synchronization can also be forced using the non-standard remote announce and remote browse sync parameters. remote announce = <IP address list or IP/WORKGROUP list> remote browse sync = <remote LMB IP address> Browse list support for LAN Manager clients like OS/2 is provided by the lm announce and lm interval parameters. lm announce = <true, false, auto> lm interval = <seconds>
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