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New Member

Inter VLAN Can't Join Domain

Hi All Pros,

I am just wondering if anyone faced this issue before where a host in another VLAN is unable to join Ms Windows domain which is in another VLAN? It does not have any access list because both are connected to the same switch (C3560). InterVLAN routing already enable. We have tested telnet to most of the ports involved in Active Directory from one host VLAN to Server VLAN. Server team checked that the Domain Controller and DNS is running FINE. Now we are stucked in between, not knowing what is the problem.

Host in VLAN 211 just unable to join domain to Server in VLAN 214. But host is able to join when in same VLAN 214.

Your help is very much appreciated.

10 REPLIES
Hall of Fame Super Silver

Re: Inter VLAN Can't Join Domain

Hello Chow,

try the following

int vlan 214

ip helper-address AD-server-ip-address

the difference when in the same ip subnet is that server can be discovered with a broadcast

Hope to help

Giuseppe

New Member

Re: Inter VLAN Can't Join Domain

Hi Giuseppe,

The DHCP server is actually not in the Domain Controller. There is one WLC in the network working as DHCP for the entire network.

We have tried setting all IP in VLAN 214 or 211 manually to host but still not able to join domain.

Re: Inter VLAN Can't Join Domain

Are the hosts in Vlan 211 are WLAN clients or connected on switches..??

New Member

Re: Inter VLAN Can't Join Domain

All connected through LAN... There isn't any client in VLAN 214 ...We only did it for testing purpose..

New Member

Re: Inter VLAN Can't Join Domain

can any hosts on vlan 211 ping the servers in vlan 214??

New Member

Re: Inter VLAN Can't Join Domain

yes, PING and TELNET is working from VLAN 211 to VLAN 214..

Re: Inter VLAN Can't Join Domain

Hi,

If hosts on vlan 211 able to ping hosts on vlan 214, then this is probably LDAP Protocol issue.

Could you confirm that port 389 TCP is not blocked any where?

HTH

Mohamed

New Member

Re: Inter VLAN Can't Join Domain

Hi,

There isn't any access-list that block inter Vlan communication. However, I will try to do a telnet from VLAN 211 to DC through TCP 389 ... but i think if the DC is listening to this port, it shouldn't be any problem.

New Member

Re: Inter VLAN Can't Join Domain

ok, i've tested and we are able to telnet from 211 to DC through TCP 389 ...

New Member

Re: Inter VLAN Can't Join Domain

I have finally solved this issue. It is not due to any routing or configuration problem. The problem is from the Domain Controller's end.. It is due to "Single Label Domain" issue when they created the Domain Controller.

Below links as references;

http://support.microsoft.com/kb/300684

http://www.chicagotech.net/server/singlelabledns1.htm

How do we close or end this topic?

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