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DHCP and Wireless connections

Posted on 2008-10-18
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Last Modified: 2013-11-12
Hello All

Heres something that is taxing my brain. I have setup SBS2003, there are two NIC cards and the DHCP is enabled on the server and disabled on my Netgear Router. Ethernet connections to the network are working fine, they are all XP sp2.

Until last night, a few laptops were connecting via wireless to the 2Wire BT router which was acting as the DHCP server. I dropped the router in favour of the Netgear one and now the SBS runs the DHCP. The Vista laptops are now unable to connect to the Router, running ipconfig/release and then renew results in DOS replying the DHCP server cannot be located, obviously as it's looking for the router to assign an IP address.

Does anyone know how to setup vista's wireless connection so that it looks for the server to get it's IP address assigned? My boss is back on monday and he also has Vista on Wireless so I need to get this working! Any advice or help would be greatly appreciated

Best Regards
Bryn
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Question by:brynstar
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by:JohnGerhardt
ID: 22747628
There is no setting for this as in order to get the DHCP server then you would need an IP..! Catch 22...!
In order to get a DHCP address the client needs ot be on the same subnet as the DHCP server or there needs to be a router in between the subnet the clients are on and the subnet the DHCP server is on. This router will then forward the DHCP requests on to the correct subnet for the DHCP server to issue the IP..

Can you give us an idea of your network setup and we can get this sorted for you...
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by:Benji_
ID: 22747640
I know this sounds a little strange but try as follows

On the netgear enable the DHCP as well as leaving enabled on the SBS server,
give it the same IP range as the sbs server , makesure the router IP is in the reserved area, and make sure the SBS server is allocating the same as your router, what will happen is the router will assign and IP and then tell the DHCP and it will bring it into the domain if you do an IPconfig /all you should see that the details are the same as when you are on the Domain,,

Its not the FULLY offical way of doing it but its the way to do it if you dont want to shell out for hardware.  

I have the same setup here and had the same problem as you.

Hope it help:D
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Author Comment

by:brynstar
ID: 22747647
Hi John

Ok the server looks like this

WAN NIC
IP               10.10.10.01
Mask         255.0.0.0
gateway   10.10.10.01
DNS          192.168.1.2
WINS         blank

LAN NIC
IP               192.168.1.2
Mask          255.255.255.0
gateway    blank
DNS           192.168.1.2
WINS         192.168.1.2

Netgear Router
IP               10.10.10.01
WAN IP      81.xx.xx.44
MASK        255.255.255.255

DHCP RANGE ON SBS

192.168.1.0 - 192.168.1.254

Best Regards
Bryn
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Author Comment

by:brynstar
ID: 22747686
Benji_:

Thanks for your response, however, I have 2 NIC cards and I thought that the NIC going to the router cannot be in the same range as my NIC going to the switch, and that the Internet Connection Wizard wont complete when both cards are in the same range? Do you have 2 NIC's on your server too?

Best Regards
Bryn
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by:Benji_
ID: 22747692
No,  

to prvent the need of buy additional hardware i use 1 nic, confirgure the SBS witht he wizard with the DHCP off as you did, then to get my wireless working i then just enabled the DHCP,

I find 1 nic less confusing and TBH cant see the need for 2 nics unless you have 2 internet gateways.
But all depends on what your configuration is prefered as mine is 1 NIC, and the appropriate firewalls on your server,  something like the old Sygate which you can find from google or eset or which ever you prefere.  windwows firewall is ok.
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by:Darr247
ID: 22747811
See http://support.microsoft.com/kb/928233

Then check that your netgear has the latest firmware - http://kbserver.netgear.com/products/DG834G.asp
check what version router you have, and also check what version firmware it has.
e.g. if it's a version 5, the lastest firmware is v6.00.21 - if you have an earlier version of firmware the router may not properly support the DHCP broadcast flag as described in that microsoft knowledgebase article.

It's not accepted practive to run multiple DHCP servers on the same network segment. It's not impossible, just not recommended, and invites problems.
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by:Darr247
ID: 22747817
Just to clarify, see if upgrading the firmware on the router to the latest version fixes the problem, rather than editing the registry on every vista machine that wants to connect and fetch a DHCP address.
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by:Benji_
ID: 22747823
If you change to 1NIC, it might solve the problem anyways, it could be the 2 ranges that is the problem
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by:JohnGerhardt
ID: 22748312
Which subnet are the clients connectected to???
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by:Benji_
ID: 22749533
clients on his setup atre on the 192,  but hes connecting wireless users to 10.

which is where i feel the problem is arising for him:D
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by:larsga
ID: 22749895
I think a network diagram would be helpful here. Here is my current understanding, please correct if wrong.

You have Internet connectivity through the BT router.
WAN NIC on the SBS is connected to the BT router.
LAN NIC on the SBS is connected to a switch, and all client PCs are also connected to this switch.

Where is the "WAN" NIC on the Netgear connected? To the BT router or to the LAN switch?

If the goal is to let wireless clients going through the Netgear get access both to the Internet and LAN PCs/SBS, then I would connect the WAN NIC on the Netgear to the LAN switch.

Then we need to do some configuration on the Netgear. The best way to configure it would depend on the capabilities of that particular Netgear router. If you give me the name/model, I'll look up the manual on how to do it.
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by:larsga
ID: 22749941
I missed that the model number on the Netgear was in a tag. I'll look up the manual now.

How you would wire up and configure stuff depends on what machines connecting through wireless on the Netgear should have access to. So I can't give you a full answer without knowing if people on wireless should be able to reach:
- Internet only
- Internet + SBS
- Internet + SBS + network devices (PCs/printers/etc) that is connected on the LAN side of the SBS.

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Author Comment

by:brynstar
ID: 22764892
Ideally I would like people on the wireless to be able to connect to Internet, SBS and the network devices.

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Author Comment

by:brynstar
ID: 22764898
The clients are connected to the 255.255.255.0 subnet
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by:Rob Williams
ID: 22768586
The issue is SBS is also acting as a router/gateway. The DHCP server only serves IP's on the LAN connection 192.168.1.x not the public connection 10.10.10.x
In order for a client IP to obtain an IP it must be connected to the LAN, your switch, not the Netgear which is on the public /firewalled side of the SBS.
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brynstar earned 0 total points
ID: 22783664
hey all

just to let you know I used a access point via the switch to allow wireless within the network,

best regards
bryn
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