Good to see your reply & Thanks well, all my Server is in Workgroup.Below are the unedited ipconfig /all C:\Documents and Settings\Administrator>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : Col-Srv Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection Physical Address. . . . . . . . . : 00-0C-29-8D-9C-D1 DHCP Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 192.168.1.7 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : Now I am able to ping. But i want to know that even without configuring any WINS server, how i am able to ping? I appreciate your quick reply. Thank you once again. Regards, Param Param

Hi, are they all in the same subnet? Your default gateway is missing or if you don´t have a DNS/WINS server Netbios is used for nameresolution. But NetBios can reach only clients in the same subnet.

Hello, please see http://support.microsoft.com/kb/172218/en-us about host name resolution.Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

Hi M.Hivner, Thanks for your reply. I have only one subnet and there is no requirement of Default gateway. How NetBios reach to the client in the same subnet? ( do you know the process how it works? ) Regards, Parmatma Param

Hi, NetBios sends Name query requests (broadcasts) to the local subnet. i.e. Server1 asks for clientA. If the request reachs clientA (TCP/IP-Netbios-Helper-service must be started), clientA answers server1 and tells the IP. If nobody answers, name resolution fails. Eventually you have to activate Netbios for Name Resolution in the advanced TCP/IP settings (WINS-Tab). hope this helps, Kind regards, M.Hivner

Hi M.Hivner, Nice to see your reply, Thanks. It is really helpful. That means every PC in a subnet query or broadcasts to every PC ( for getting Netbios name ). In how many second it query, what is the repetition time. waiting for your reply. Warm Regards, Parmatma Param

another main important thing to be noticed that name resolution uses port 137 make sure that its always available usually firewall and some avs stops themhttp://www.virmansec.com/blogs/skhairuddin

That means every PC in a subnet query or broadcasts to every PC ( for getting Netbios name ). Hi, not for getting Name, but for getting the clients IP. Imagine CLIENT1 looks for CLIENT2, so CLIENT1 sends a broadcast "Who is CLIENT2?". This broadcast reaches all Clients in the subnet. If CLIENT2 is online, CLIENT2 answers: "Im CLIENT2, my IP is 10.0.0.2" and communication can begin. My description is very simplified, but the real process is similiar. In how many second it query, what is the repetition time. hmm... i cannot really say, in maximum a few seconds, i think. It´s dependent of load and your networktopology. I found this article: http://technet.microsoft.com/en-us/library/bb727013.aspx. There is a detailed description of this process. Kind regards, M.Hivner

another main important thing to be noticed that name resolution uses port 137 make sure that its always available usually firewall and some avs stops them http://www.virmansec.com/blogs/skhairuddin Thank you Mr. SyedParam

I have 16 server ( physical as well as virtual machine ). some time i am able to ping directly from Name and hardly sometime i fail to ping directly from name, than i have to use IP address but this issue get automatically corrected I think i am able to ping directly from name without any dns server is because of WINS. so, i want to understand why some time i am unable to ping with NameParam

Hello, are this servers in a domain or workgroup? A domain relies on configured DNS servers that are used from all domain machines. PLease post an unedited ipconfig /all from one server and a client where you are not able to ping with names. It is not clear for me if you only use WINS or also DNS.Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.