Host name duplication

Satish_Jana · Feb 4, 2014

Hi All,

Host name duplication exists in my network

Scenario :
- Consider Comp1 in VLAN1 and Comp2 in VLAN2
- If i change the computer name as Comp1 in VLAN2 it accepts without any error and if i ping Comp1 it gives me a result the ip address belongs to VLAN2

Please let me know in the scenario if we are give Comp1 in VLAN2 in there any way we can get an alert live "same computer name already exists in your network"

Regards,
Satish Jana

Someone Somewhere · Feb 4, 2014

They don't exist in the same network; that's the point of VLANs. They're on separate networks that merely happen to share the same cable or switch at some point.

VLANs effectively allow you to run air-gapped networks down the same cable (or fibre). The second VLAN is not in any way visible from the first.

Satish_Jana · Feb 4, 2014

Thanks for the reply.

Do you mean to say that there is no possibility so that we can stop this host name duplication error.

Someone Somewhere · Feb 4, 2014

If your VLANs are set up properly, it shouldn't matter if the same name is used. However, it's possible that your VLANs have been become tangled, if you're getting such an error.

hubbardt · Feb 4, 2014

This is an issue to do with name resolution ...

Are you just using a Workgroup?
Are you using DNS?
Are you using WINS?

Satish_Jana · Feb 4, 2014

No I'm using domain
Yes I'm using DNS
No I'm not using WINS

hubbardt · Feb 4, 2014

If you join machines to a domain you cannot have two with the same name.
They will both try and register their IP address and DNS will get confused.
http://community.spiceworks.com/topic/205867-two-computers-same-name-on-same-domain

Satish_Jana · Feb 4, 2014

I'm able to join to my domain successfully without any error....

hubbardt · Feb 5, 2014

Yes you will be able to join the domain and shortly after that you will see errors about duplicate names on the network.
The way it works is:

computerA called COMPUTER has an IP address of 192.168.1.1 joins the domain and registers its name and IP with DNS
computerB also called COMPUTER has an IP address of 192.168.1.2 joins the domain and adds another DNS record of COMPUTER with it's own IP address

If you want to connect to COMPUTER then DNS looks up the IP address in DNS.
DNS will have two IP addresses for the name COMPUTER and randomly (round robin but that's beside the point) resolve to one of them
This means you cannot be sure which machine you connect to

Does that make sense?

Satish_Jana · Feb 5, 2014

I'm not looking at DNS level, I'm looking at HOSTNAMES

Someone Somewhere · Feb 5, 2014

DNS is what registers hostnames. If you look up a hostname, your computer goes and asks a DNS server.

hubbardt · Feb 5, 2014

I think I misunderstood your original question ...
The safest thing would be to do a NSLOOKUP Computer1 before changing a computer name. You can then ping the IP to verify if it is alive

Event ID 4319 is also logged if you have duplicate names so can search your machine for that
http://support.microsoft.com/kb/242053

Satish_Jana · Feb 5, 2014

I'm not using WINS in my network.

My Domain servers reside in shared VLAN i.e., 192.166.X.X
VLAN1 ip series is 192.168.1.X
VLAN2 ip series is 192.168.2.X

this is my network
shared VLAN can access VLAN1 and VLAN2, but VLAN1 cannot access VLAN2 vice versa.

Someone Somewhere · Feb 6, 2014

I think you'll find that's subnetting, not VLANs.

Satish_Jana · Feb 12, 2014

It's VLAN's because we are using it on L2 switches.

Someone Somewhere · Feb 12, 2014

So if I plug a computer in to the wrong port on a switch, it won't work? It's got a specified IEEE 802.1q tag?

Satish_Jana · Feb 24, 2014

Sorry i didn't get you, can you please explain me in brief

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