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Need to Reverse the IP Assignments on NICs on an SBS 2003 Server

I have moved to a new location that has a PPPoE connection vs. a T1 at the old location. According to the BellSouth (AT&T) tech who installed this for me, this is an old implementation of BellSouth's DSL technology - no modem involved. Just plug a CAT5 patch cable into the wall, set up a connection in Windows and log on. Problem is that, for reasons I cannot determine, this connection is only working with certain computers. I only get a link light with certain machines and I've tried about five...all fairly new boxes (about three years old) and my laptop. Only my Dell Precision Workstation will connect. None of the other Dells (a couple of Dimensions and an OptiPlex) won't. My Dell Latitude won't either.

On my SBS server, I could not establish a link with the NIC that I had previously set as the external connection. I can, however, get a link light when I connect the patch cable to the internal NIC. Now, I figure, I need to swap the IP assignments for these two NICs.

Current configuration:
Server Local Area Connection (internal)
Intel PRO/1000 MT
192.168.16.90

Network Connection (external)
Linksys LNE100TX
192.168.1.90

Desired Configuration:
Server Local Area Connection (internal)
Linksys LNE100TX
192.168.16.90

Network Connection (external)
Intel PRO/1000 MT
No IP. The AT&T tech said that this needs to pull an address from the WAN

The Change Server IP Address would only let me change the Server Local Area Connection NIC. While I know it is dicey to do this in an SBS environment, I went into the properties of the NICs and renamed them as well as changed the IPs. Now the CEICW gives me an error:

The wizard cannot set the DHCP scope options. Ensure that the DHCP server service is running and that a scope is defined. Alternatively, disable the DHCP service manually, and then configure your client computer IP address properties. For more information about manually configuring client computers, see Help and Support.

Any help and/or suggestions would be appreciated.
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gbrooke
Asked:
gbrooke
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1 Solution
 
Rob WilliamsCommented:
Very odd, no modem?
It is possible with older NIC's you need a crossover cable. Also make sure none of your NICs are set to auto-negotiate and not locked at a specific speed and duplex.

As you are apparently aware, changing the LAN NIC configuration is risky even using the wizard. I have had it result in a server rebuild. If at all possible avoid this, but it looks like you are "into it now".
The WAN NIC is reconfigured manually as you would any NIC.
The LAN NIC MUST be changed using the Change Server IP wizard.
After changing either you need to run the CEICW.
In oder to accomplish this I would remove the existing DHCP scope, stop the DHCP service, make your changes, start the DHCP service and run the CEICW, which "should" reconfigure the DHCP scope options and DNS forwarders.
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gbrookeAuthor Commented:
Rob,

I thought it was strange, too, that there was no modem but as the tech explained to me, this condo complex is basically a big LAN with the "server room" located somewhere on the premises. All the tenants do is plug in a wire and go.

Thanks for your input. I will try your suggestions and let you know what happened.

Gregg

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Rob WilliamsCommented:
Not an ideal set up for your SBS as you cannot configure incoming connections, but I assume you were not doing so before.

You could also place your own router between the wall outlet and your SBS. This would give you added protection from the neighbors and would allow you to configure the LAN side of the router to your existing subnet.

Let us know how you make out.
--Rob
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gbrookeAuthor Commented:
The router sounds like a better solution. What brand/model would you recommend? I have a couple of Linksys units laying around but will go buy one if you have a suggestion.

This is my personal server, i.e., for my home/office. I only used Remote Desktop but was wanting to implement other features. Would the router enable me to do this? Has my messing around with it prevented me from going back to the original NIC configuration?
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Rob WilliamsCommented:
>>"What brand/model would you recommend?"
Any router will do, you are not at a high security risk as the building is likely behind a router and your SBS has its own firewall if you are using 2 NIC's.

>>" I only used Remote Desktop but was wanting to implement other features. Would the router enable me to do this?"
You need to be able to forward ports from the building router to your server or your router. I assume you can do this, or rather the building IT manager can do it for you?
As for adding the router you can then forward the traffic from it (3389 if using remote desktop) to your server. Many services can be forwarded multiple times. One that cannot is the VPN, port 1723.

>>"Has my messing around with it prevented me from going back to the original NIC configuration?"
"messing around, may have caused problems with reverting back as well as changing to a new configuration  :-)
However, just change the WAN NIC manually, the LAN NIC using the Change server IP wizard, and then run the CEICW. If having problems follow the earlier instructions with disabling DHCP temporarily.
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gbrookeAuthor Commented:
I can't get a link light on the router either. I have called AT&T to get a technician out to inspect the lines because I find it hard to believe that my computers (and my router) are the only ones in this whole complex that can't connect. The whole setup (SBS Server and five computers on the network) worked fine at my previous location. There has to be a problem in the wall jack or the line into the building.

If AT&T gives me a hard time, I am prepared to move to another provider.

Meanwhile, I'll need to leave the question open because I will need to reconfigure the server once I am satisfied with the connection and, although I understand the procedure you have laid out here, I may need additional assistance with that.
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Rob WilliamsCommented:
Have you tried a cross-over cable?
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gbrookeAuthor Commented:
Did not try a cross-over cable. Will try that when I get home this afternoon. AT&T is due to come at 5:00P tonight so I'll have a resolution one way or another tonight.
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Rob WilliamsCommented:
Let us know how it goes.
--Rob
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gbrookeAuthor Commented:
The crossover cable didn't work but, as you'll see, it wasn't going to.

The AT&T tech came shortly after I tried the crossover cable. I explained to him that only two computers out of the 7 that I have here will connect. After looking at the computers, both the ones that connected and the ones that wouldn't connect, he said, "I'll swap the pairs in the jack." He did that and everything started working.

Now, I'm trying to put the router in place. It works as I'm using it now but I can not get CEICW to complete. I reset, per your instructions, the IPs on the NICs to their original settings but the Change Server IP wizard gives me an error. After referring to changeiplog.txt (as the wizard said to do) I saw this error: 8007041d. I can't find anything with that error that relates to my situation. Everything I found relates to XP or Vista updates.

Also, currently, the router has DHCP enabled. It is running on 192.168.1.x. Do I need to disable this? I figure that since the DHCP scope (when it is working) runs on 192.168.16.x that there should be no conflict as they are separate subnets. Or does Windows DHCP look at the whole physical network?  
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gbrookeAuthor Commented:
Also, I get this error again when running CEICW:

The wizard cannot set the DHCP scope options. Ensure that the DHCP server service is running and that a scope is defined. Alternatively, disable the DHCP service manually, and then configure your client computer IP address properties. For more information about manually configuring client computers, see Help and Support.

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Rob WilliamsCommented:
>>""I'll swap the pairs in the jack.""
Interesting as the way to make a crossover cable is to swap the pairs in the jack.

If your configuration is:
wall plate => router => SBS=> switch => clients
as it should be with 2 NIC's DHCP can be enabled on the router without adversely affecting the SBS or the clients.

Try disabling DHCP on the server and running the wizards. Once complete you can delete the DHCP scope and re-enable DHCP and then run the CEICW again.
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Rob WilliamsCommented:
You are not running SBS premium with ISA server installed are you?
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gbrookeAuthor Commented:
Not running SBS Premium.

Yeah, that's what I thought when he said that he could have just said that because something else was wrong. Coincidentally, he was the same guy that did the original install. Maybe he realized he missed something.

Meanwhile, before I saw your most recent response, I took a blind shot and created my own scope then ran CEICW. Everything is up and running now. Do you think that's OK as a permanent solution or should I do something else?

Yes, the configuration is: wall plate => router => SBS=> switch => clients. So, we are good there.

I'm not sure which suggestion to accept. Your comments helped me troubleshoot the problem and got me thinking about the various possibilities but all of them helped.
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Rob WilliamsCommented:
If clients can connect to the Internet, and the CEICW will run clean, you should be all good.

As for accepting questions, which one is not that important. Often the last post in a thread by whom you feel helped is chosen and people realize multiple steps lead to that.
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gbrookeAuthor Commented:
Thanks, Rob! As always, your help set me on the right track.
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Rob WilliamsCommented:
Thanks gbrooke.
Cheers!
--Rob
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