n00b networking question.

Princey · 18 Dec 2011 at 12:00

I'm having issues with client computers getting the correct DNS address from the server.

In a VM enviroment I have Server 2008 RC2 as my domain controller an I have a Windows 7 Enterprise client. Now when I first come to log on to the client the machine will have the correct IP for the DNS server of 192.168.159.134 which is also the address of the Server, thats what I want. Now when I log off and few times and switch users and what not the DNS IP then changes to 192.168.159.2 which is the gateway IP which then means I can't apply any GPO or anything. I can retrieve the correct IP by relasing and renewing the IP using ipconfig. I've also tried to apply a DNS GPO so it always goes to 192.168.159.134 but it had no effect. Any ideas?

Just showing that the DHCP is set to 192.168.159.134

Clients IP config.

Fanatic · 18 Dec 2011 at 12:16

Is the default gateway a router? Is the router also acting as a DHCP server?

ots3go · 18 Dec 2011 at 12:36

Looks like you've two DHCP servers, one of which is giving out the same IP pool but a different DNS server.

Princey · 18 Dec 2011 at 12:55

Fanatic said:
Is the default gateway a router? Is the router also acting as a DHCP server?

I have a Virgin Media Superhub as my router in the house but these two machines are running in a virtual enviroment, would the router have anything to do with this?

ots3go said:
Looks like you've two DHCP servers, one of which is giving out the same IP pool but a different DNS server.

Can you give any advice where I would look and check settings for this?

SoundsGood · 18 Dec 2011 at 13:00

Log in to the Virgin router, disable DHCP server

Princey · 18 Dec 2011 at 13:12

Will that effect the other devices connected to the router?

ots3go · 18 Dec 2011 at 13:18

Jamesy P said:
Will that effect the other devices connected to the router?

No, as you want all the machines to be getting a DHCP address off of your DHCP server and not the router?

Gaz1988 · 18 Dec 2011 at 13:21

disbaled dhcp on the router, make sure the server hands out the .2 address as the 'router'

Princey · 18 Dec 2011 at 13:40

But this being in a VE surely my external rotuer would have no bearing on this? It's all emulated NIC's and made up IP's? The IP's in the VE aren't the same as what my host machine are using or the router.

ots3go · 18 Dec 2011 at 15:28

Ah okay.

What you got in the pool option for DNS?

Princey · 18 Dec 2011 at 17:53

Just 192.168.159.134 which is what I want. I think I may of sorted now. In the configuration for the server NIC I had the DNS set to 127.0.0.1 to point to itself, I changed that to 192.168.159.134.

TNGL · 18 Dec 2011 at 18:47

Jamesy P said:
Just 192.168.159.134 which is what I want. I think I may of sorted now. In the configuration for the server NIC I had the DNS set to 127.0.0.1 to point to itself, I changed that to 192.168.159.134.

It should be 127.0.0.1 if it's hosting DNS... at least in my experience anyway.

Princey · 18 Dec 2011 at 19:22

Ok turns out that hasn't actually worked so I've put it back to 127.0.0.1. I'm still having the same issue. =/

PistolPete · 18 Dec 2011 at 23:34

Have you done an ipconfig /renew on the adaptor??

Princey · 13 Jan 2012 at 21:58

Sorry to bump this but I'm still having this issue, I've even got a ubuntu client to be added and again that is aslo picking up 192.168.159.2 as the DNS server instead of 192.168.159.134.

Just wondering if I need to change the network adapter settings in the VM software as all the VM's have the network adapters configured to NAT?

oddjob62 · 13 Jan 2012 at 22:54

What Virtualization software are you using? I seem to recall at least one of them having inbuilt DHCP functionality.

Princey · 13 Jan 2012 at 23:15

Wmware server.

oddjob62 · 13 Jan 2012 at 23:22

And there's definitely no DHCP set up on the Virtual network?

Princey · 14 Jan 2012 at 00:04

Correct. I'm totally at a loss. I've even assigned a GPO to set the DNS to 192.168.159.134 yet that still doesn't work.

oddjob62 · 14 Jan 2012 at 01:12

Jamesy P said:
Correct. I'm totally at a loss. I've even assigned a GPO to set the DNS to 192.168.159.134 yet that still doesn't work.

I still think it's something within Vmware Server. Have you completely stopped the DHCP service?

I would install wireshark on the client and go though the DHCP process line by line.