am having two server with different network.
unable to access the servers either side with netbios name.
Please advice me how to enable the access.
Its very urgent i would be greatfull if i got the resolution ASAP.
Thanks in Advance
NetBIOS name must be resolved to an IP Address (the NetBIOS name-IP address resolution) which is often done by WINS server.
are you able to ping server through their IP address? If yes and you are unable to ping through Netbios, you need to look at your WINS server as it is not resolving Netbios name to IP address.
in addition to that, you can create an entry in the LMHOSTS file on windows PC from which you are trying to ping server with Netbios name. LMHOSTS is generally kept at c:\winnt\system32\drivers\etc. Once done, you should be able to ping server through Netbios name.
hope it helps ... rate if it does ...
Yes, we can ping through IP. Is any access-list need to configure to open the required ports?
Because some other servers are accessing this server through Netbios name. I couldn't check that network setup that is the issue now....
I feel TCP ports 135-139 should be allowed if they are getting blocked by an ACL applied to any of the interface between servers.
check this URL to get more information.
Use the IP HELPER-ADDRESS command onthe interface with the windows client. This command forwards the NetBios UDP packets across differing networks...Please rate....
Please tell me what will happen if execute the below command.
Permit udp any any eq netbios-ns
Permit udp any any eq netbios-dgm
Permit udp any any eq netbios-ss
This ACL is permitting any source network to access any destination network on netbios-ns, netbios-dgm, netbios-ss UDP ports. Rest all traffic will be denied by the ACL as there is always a implicit deny in access lists.
hope it answer your query .. rate if it does ..
I was looking at microsoft site and found that Netbios uses below TCP/UDP port numbers.
Network basic input/output system (NetBIOS) name service:- 137/tcp, 137/udp
NetBIOS datagram service:- 138/udp
NetBIOS session service:- 139/tcp
so we need to open these particular TCP/UDP ports in ACL. In your ACL, only UDP ports are permitted but few service use TCP port and not UDP, so we need to re-design ACL like this.
access-list 10 permit udp any any eq netbios-ns
access-list 10 permit tcp any any eq netbios-ns
access-list 10 permit udp any any eq netbios-dgm
access-list 10 permit tcp any any eq netbios-ss
access-list 10 permit udp any any eq 137
access-list 10 permit tcp any any eq 137
access-list 10 permit udp any any eq 138
access-list 10 permit tcp any any eq 139
rest traffic will be deinied, make sure you add further permit statements to allow inside traffic to go outside depending on your requirement, otherwise traffic from inside will go for only these ports and other traffic will be blocked.
check this URL which tells about the specific ports used by NetBIOS.