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Interface state, packet rates and errors. Display socket connection status.
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Example 15.3 netstat Display Routing $ netstat -rn Routing tables Destination Gateway.Flags Netmasks: (0) 0 ff00 (0) 0 ffff ff00
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Route Tree for Protocol Family 2: default 145.142.210.100 UG 127 127.0.0.1 U 140.142.78 145.142.210.20 U
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Running Daemons
If you are confident that all network communication paths are functioning correctly, then the next step is to certify that the Samba smbd and nmbd daemons are running and listening for connections. Display the process status of smbd and nmbd with the ps command (Example 15.4). Review inetd configuration (see "Configuration Files" section) to verify that the daemons will be spawned when SMB services are requested. Check the smb.log and nmb.log files in /usr/local/samba/var for diagnostic messages indicating any startup or communication anomalies. Example 15.4 'ps' Check Daemon Process Instance # ps -ef | grep smbd root 448 1 0 07:25 00:00:00 /usr/local/samba/bin/smbd -D # ps -ef | grep nmbd root 446 1 0 07:25 00:00:00 /usr/local/samba/bin/nmbd -D Assuming that the smbd and nmbd daemons are up and running, next look to see if they are listening for incoming connection requests. Invoke netstat with the a option to list the set of port listening services on the server. You can thin the list down to just the NetBIOS services by piping the command into grep (Example 15.5). Example 15.5 Samba Listing to NetBIOS Ports $ netstat -a | grep netbios
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tcp udp udp
0 0 0
0 *:netbios-ssn 0 *:netbios-ns 0 *:netbios-dgm
":" ":" ":"
LISTEN
At this point we know that smbd and nmbd are up and listening for network requests. The question now is whether they will actually respond to a request. Verify responsiveness by sending a query to each daemon from local and remote clients. Check smbd on the local server by executing the smbstatus and smbclient commands. The smbstatus command will display the server version, active connection list, lock file, and memory utilization statistics (Example 15.6). Use the L option of the smbclient command to ask the server for a list of shares (Example 15.7). If smbd is responding, you should see output similar to the examples. If you experience password errors, verify that the security and encrypt passwords parameters are correct for your authentication environment. Also check for hosts allow, hosts deny, or valid users parameters that might restrict access. Example 15.6 smbstatus $ smbstatus -d Samba version 2.0.5a Service uid gid pid machine ------------------------------------No locked files Share mode memory usage (bytes): 1048464(99%) free + 56(0%) used + 56(0%) overhead = 1048576(100%) total Example 15.7 smbclient Share List $ smbclient -L BONZO Domain=[LAB] OS=[Unix] Server=[Samba 2.1.0-prealpha] Sharename --------netlogon IPC$ Server -----BOZNO ZARDOZ Type ---Disk IPC Comment ------IPC Service (UW Lab login)
Comment ------Lab login server Presentation Workstation
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Workgroup --------EYRIE TEST LAB
Master -----WIZARD ILLUSTRIOUS BONZO
Ask Samba for the same share list from a remote Windows client by invoking NET LIST from a command window. NET VIEW \\<Samba \\<Samba NetBIOS name> Now verify that nmbd is responding to queries both locally and from remote clients. From the local server execute the nmblookup command with the local host name as an argument. nmbd should respond with the server's IP address confirming that it is correctly handling name service queries (Example 15.8). You can further exercise nmbd by requesting a name list via broadcast (Example 15.9). Remember that if the workgroup or domain spans multiple subnets, you'll need one or more WINS servers to support cross-subnet name service. Example 15.8 nmbd Name Service Test # nmblookup -B OPUS __SAMBA__ Sending queries to 0.0.0.0 145.142.210.145 opus<00> Example 15.9 Name Query Broadcast # nmblookup -d 2 '*' Added interface ip=145.142.210.145 bcast=145.142.210.255 nmask=255.255.255.0 Sending queries to 145.142.210.255 Got a positive name query response from 145.142.210.145 ( 145.142.110.145 ) Got a positive name query response from 145.142.210.68 ( 145.142.210.68 ) ... 145.142.210.102 *<00> 145.142.210.227 *<00> 145.142.210.74 *<00> The Windows NBTSTAT command is a good all-purpose tool for verifying NetBIOS over TCP services and statistics in a workgroup or domain (Table 15.3). You can use NBTSTAT to verify both smbd and nmbd information from Windows clients and servers (Example 15.10). Table 15.3 NBTSTAT Options
NBTSTAT [-a <RemoteName>] [-A <IP address>] [-c] [-n] [-r] \[-R] [-s] [S] [<interval>]
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