Domain issue

Unanswered Question
Feb 1st, 2009

<p>Hi ,</p>

<p>I have a site with around 100 users. There are total 3 Vlans for each of the floors. Users on one floor are not able to access the  PCs of other users (on different floors) using the hostnames. But they can do this with IP address.</p>

<p>Initially this site had a single /22 block. And all users were able to access each other's PCs with hostnames. This does not seem to work in the current scenario with 3 Vlans of /24 each.</p>

<p>Isn;t  NetBeui the protocol which would be used for local hostname resolution. Also, since this is not a routed protocol, how will my current scenario work?</p>

<p>Appreciate if someone could help me out.</p>

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Paolo Bevilacqua Sun, 02/01/2009 - 04:02

Hi, it mainly depends how your MS networking is setup. That is, if you loging to the network, have a PDC (Primary Domain Controller), etc.

When done properly, that makes name resolution work automatically.

If you don't have a proper config, try setting windns entry in dhcp to some server. If neither that helps, you will probably need udp helper.

navneet_78 Sun, 02/01/2009 - 04:30

Thanks for your reply!!

We dnt have much of a configuration from the user end. There are policies defined in the DHCP scope, and IP helpers on the Data VLan for users to get IPs.

Does the name resolution process try and contact the DNS servers which are located in a diff location (in my scenario), or it does it locally, and WAN does not come into picture?





Paolo Bevilacqua Sun, 02/01/2009 - 04:45

If the wins settings in dhcp scope are ok, try the following: replace ip helper address currently to DHCP server with same LAN direct broadcast: eg for a /24. Also add a 2nd helper for the other VLAN, so you have 2 for each of the 3 interfaces.

This will actually cause all netbios broadcast to be flood, but it will not be otherwise harmful.

The way windows (netbios) name resolution works, is that in "proper networking" the station knows its servers address (dhcp/static settings, domain logon, or hosts file). If the PC doesn't have that, it recurs to broadcast. So when you have a WAN or otherwise subnetted environment, you must take the above in consideration.


navneet_78 Sun, 02/01/2009 - 07:26

Thanks for your response!! It really helps clear a lot of things.



Mohamed Sobair Mon, 02/02/2009 - 03:56

IF they are able to communicate using their IP Addresses , then there is no routing problems.

To access the PCs using their Hostnames, you will require (LDAP) protocol (Internal DNS server) for hosname resolution.




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