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Lists the remote machine's name table given its name Lists the remote machine's name table given its IP address Lists the remote name cache including the IP addresses Lists local NetBIOS names Lists names resolved by broadcast and via WINS Purges and reloads the remote cache name table Lists sessions table with the destination IP addresses Lists sessions table converting destination IP addresses to host names via the hosts file
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Example 15.10 NBTSTAT C:\ NBTSTAT c WIZARD Node IpAddress: [192.168.0.2] Scope Id:[] NetBIOS Remote Cache Name Table Name Type Host Address Life [sec] ---------------------------------------WIZARD <00> UNIQUE 192.168.0.1 360 C:\ NBTSTAT a WIZARD NetBIOS Remote Machine Name Table Name Type Status ----------------------------------------WIZARD <00> UNIQUE Registered EYRIE <00> GROUP Registered WIZARD <03> UNIQUE Registered WIZARD <20> UNIQUE Registered EYRIE <1E> GROUP Registered DEROEST <03> UNIQUE Registered EYRIE <1D> UNIQUE Registered
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If you discovered by means of a ps process check, that one or both of the Samba smbd and nmbd daemons weren't running verify that your daemon startup configuration is correct. Remember that the Samba daemons may be started either as persistent processes by init during system initialization or automatically when a service request is received by inetd (Example 15.11). Example 15.11 Samba Daemon Startup Configuration init boot-time startup - /etc/rc<file> /usr/local/samba/bin/smbd -D /usr/local/samba/bin/nmbd -D -orinetd service startup - /etc/inetd.conf netbios-ssn _stream tcp nowait root /usr/sbin/tcpd \ /usr/local/samba/bin/smbd smbd netbios-ns _dgram udp wait root /usr/sbin/tcpd \ /usr/local/samba/bin/nmbd nmbd
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Server connection problems may be related to missing or invalid port numbers in /etc/services. Make sure that udp port 137 and tcp port 139 are reserved by the netbios-ns and netbios-ssn services respectively (Example 15.12). Example 15.12 Samba Port Configuration /etc/services netbios-ns netbios-ssn 137/udp 139/tcp
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smb.conf
Overall behavior of Samba is proscribed by the smb.conf file. The global section of smb.conf should include parameters that identify the server's NetBIOS name, the workgroup/domain name, the security type, and whether passwords will be encrypted or in plain text (Table 15.4). Table 15.4 Important Global Section Parameters
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security = <share, user, server, domain> netbios name = <server NetBIOS name> workgroup = <workgroup/domain name> password server = < > encrypt passwords = true
Next check the parameters that identify Samba's role in services like WINS, browsing and domains. Refer to the chapters regarding each of these services in order to confirm whether Samba is acting as a client or server.Verify that access control parameters in the global and service sections of smb.conf are reflecting the desired access permissions for the server and each share. For example, you may be blocking access due to improperly configured hosts allow and hosts deny parameters. The smb.conf file can become unwieldy for complex sites with large numbers of servers, services and/or users. Tools like testparm and SWAT can be used to assist in certifying correctness. testparm validates the syntax and options you have specified for each section of smb.conf. If a host name or IP address is supplied as an option, it will check the access rights of the specified host. $ testparm < -s configfilename> <hostname hostIP> SWAT is a system administration tool that provides html forms for each section in smb.conf (Figure 15.2). SWAT can be used to simplify general configuration tasks allowing the system administrator to focus on the section parameter definitions of interest.
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Figure 15.2: SWAT
Authentication
There are many things that can go wrong when setting up authentication mechanisms. Here are a few suggestions for ferreting out bugs in the standard Samba authentication schemas. Check the encrypt passwords parameter for plain-text or NTLM-encrypted password format. If they are plain-text passwords, confirm that the UNIX passwd file path is correct or that the remote authentication server is identified. You may need to fine-tune string guessing permutations to correctly guess uppercased user names and passwords. If there are encrypted passwords, then verify that the smbpasswd file exists, is populated with users, and is correctly formatted, or that the remote authentication
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server is identified. For Samba domain controllers, check to see that the netlogin share has been defined. Validate using smbclient U to test authentication.
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