Netbios Packets Between Vlans

[cristhiannunez]

Hi everyone,

Currently this is my situation:

I have a omniswitch 6850 with 3 vlans created. vlan1 is for corporate servers where i have web server,mail server, domain controller, etc, vlan2 and vlan3 are for clients. The clients are able to use all the corporate servers resources (mail,web,softphone,etc) except the domain controller services where my nightmare begins.

As you know the domain controller works with netbios packets. Each client when is going to authenticate into the domain controller send netbios packets to broadcast and the domain controller can respond.The problem is that i dont know (or i havent know where to search) how to forward that netbios packets from vlan 2 and 3 to the domain controller located into vlan1.

Thanks in advance...

Cristhian

[cedric1]

hello

this is not a netbios issue.

You need to activate DNS on your windows domain controller.

All windows entry (domain info etc) will be configured in this dns.

so client must as dns ip, domain controller ip .

dns = domain controller.

your issue will be solved in this way.

Cedric

[cristhiannunez]

Cedric,

Sorry, i didnt explain correctly.

I have a domain controller running LDAP and Samba. Before i split the network into vlans everything was working well. Now, this is the only issue that i have. The server running the domain controller is dhcp server and dns server either.

I dont understand when you say "You need to activate DNS on your windows domain controller."

Can you explain me please.

I really apreciate your help.

Cristhian

[cedric1]

hello

I think about this.

http://support.microsoft.com/kb/247811

Loaction of domain controller on routed network is done via dns.

Regards

Cedric

[cristhiannunez]

I got your point. The thing is that my domain controller (Linux LDAP), dns domain and dhcp server are running on the same server from the beginning.

I dont undertand what can be happenning, may be if a setup ldap client into authenticating against my ldap server. ?


Thanks,
Cris

[cedric1]

hello

User connecting in the same vlan as domain controller is working fine ?

If yes , sniff packet and exchange difference in the same vlan as server domain , and in problematic vlan.

After this analyse we will see if we can solve issue with setup of the switch

Cedric

[cristhiannunez]

Hi,

Previously to create this posts, i did those tests. User connecting and domain controller in the same vlan is working well.

When both (Client and server) are running in the same vlan, netbios packets sent by clients to broadcast address are responsed by domain controller.

When they are in different vlans, the clients send netbios packets to broadcaste address but dont receive any response.

Thanks

Cristhian

[cedric1]

ok

You can use udp relay for netbios packet to forward traffic to a specific Vlan.

Try this :

ip udp relay nbnsnbdd vlan X

vlan X = domain controller vlan

Cedric

[cristhiannunez]

Cedric,

When i try to use this command, it display this:

ERROR: Please create UDP instance first before assigning a VLAN range.

How can i create an udp instance ?

Thanks again

Cristhian

[cedric1]

hello

in 6.4.2 it is preconfigured

ip udp relay {BOOTP | NBDD | NBNSNBDD | DNS | TACACS | TFTP | NTP | port} vlan vlan_id

ip udp 137 vlan 1
ip udp 138 vlan 1