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More than one DHCP server? - W2k3 and wireless

 
 
boe
Guest
Posts: n/a

 
      08-17-2004, 06:12 AM
I have my file server acting as a DHCP server. All of my workstations
receive their IP address from it at 192.168.1.200. It services
192.168.1.100-199. My FW/gateway is at 192.168.1.8

I have a linksys wireless gateway that by default is 192.168.1.1 and can act
as a DHCP server. I can easily change the address of this.

Is there any way to make sure that one is only selected if the network card
cannot find the main DHCP server? Basically I'd like the PC's with network
cards to go to the file server first. The laptops with wireless cards would
scan for any dhcp server they could find and that would be the wireless
gateway. Is there a way to make this happen?

Thanks


 
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Miha Pihler
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Posts: n/a

 
      08-17-2004, 08:02 AM
Not really. Clients use broadcasts to find DHCP server and if two DHCP
servers respond with configuration they will use first one that responded
and ignore the second one.

What you can do is have two DHCP at the same time. The only thing you have
to watch out for is that they don't server same IPs.

E.g. you can give first DHCP a range of IPs from 192.168.1.50-149 and second
DHCP range from 192.168.1.150-254.

One problem is, you can make reservations on only one of them.

Mike


"boe" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> I have my file server acting as a DHCP server. All of my workstations
> receive their IP address from it at 192.168.1.200. It services
> 192.168.1.100-199. My FW/gateway is at 192.168.1.8
>
> I have a linksys wireless gateway that by default is 192.168.1.1 and can

act
> as a DHCP server. I can easily change the address of this.
>
> Is there any way to make sure that one is only selected if the network

card
> cannot find the main DHCP server? Basically I'd like the PC's with

network
> cards to go to the file server first. The laptops with wireless cards

would
> scan for any dhcp server they could find and that would be the wireless
> gateway. Is there a way to make this happen?
>
> Thanks
>
>



 
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Chris Edson [MSFT]
Guest
Posts: n/a

 
      08-18-2004, 04:41 PM
Actually, Windows Server 2003 allows you to make reservations within an
excluded address range. Thus, you could make reservations on both devices,
as long as you are reasonably sure that no two machines will ever manage to
take out the same address at once... (generally not going to happen, based
on uniqueness of MAC addresses).

A DHCP client generally takes out a lease on the first Offer it receives, so
when your clients are wired, its a matter of response time as to which DHCP
Server it will take a lease from... Try out the split configuration, and
see if it works for you.

Another option: Have you tried your wireless clients with the Linksys' DHCP
Server turned off? If it allows you to associate to the AP portion, and
then allows you to do the DHCP broadcasts onto the subnet, then you may be
home free with just one DHCP Server...
--
==============================
Chris Edson
(E-Mail Removed)

Upcoming Tech Chat !
August 24, 1:00-2:00p Pacific
DHCP: Configuring and Deploying DHCP with Windows Server 2003 Part 2
Join the DHCP test team as we talk about any questions, concerns, or
recommendations you might have for DHCP Server in Windows Server 2003.
Chat Room:
http://communities2.microsoft.com/ho...iteid=34000015

Transcript of previous chat:
http://www.microsoft.com/technet/com...k/net1120.mspx

This posting is provided "AS IS" with
no warranties, and confers no rights.
===============================



"Miha Pihler" <mihap-(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Not really. Clients use broadcasts to find DHCP server and if two DHCP
> servers respond with configuration they will use first one that responded
> and ignore the second one.
>
> What you can do is have two DHCP at the same time. The only thing you have
> to watch out for is that they don't server same IPs.
>
> E.g. you can give first DHCP a range of IPs from 192.168.1.50-149 and
> second
> DHCP range from 192.168.1.150-254.
>
> One problem is, you can make reservations on only one of them.
>
> Mike
>
>
> "boe" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> I have my file server acting as a DHCP server. All of my workstations
>> receive their IP address from it at 192.168.1.200. It services
>> 192.168.1.100-199. My FW/gateway is at 192.168.1.8
>>
>> I have a linksys wireless gateway that by default is 192.168.1.1 and can

> act
>> as a DHCP server. I can easily change the address of this.
>>
>> Is there any way to make sure that one is only selected if the network

> card
>> cannot find the main DHCP server? Basically I'd like the PC's with

> network
>> cards to go to the file server first. The laptops with wireless cards

> would
>> scan for any dhcp server they could find and that would be the wireless
>> gateway. Is there a way to make this happen?
>>
>> Thanks
>>
>>

>
>



 
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boe
Guest
Posts: n/a

 
      08-20-2004, 05:42 AM
Thanks

"Chris Edson [MSFT]" <(E-Mail Removed)> wrote in message
news:%23pfp%(E-Mail Removed)...
> Actually, Windows Server 2003 allows you to make reservations within an
> excluded address range. Thus, you could make reservations on both
> devices, as long as you are reasonably sure that no two machines will ever
> manage to take out the same address at once... (generally not going to
> happen, based on uniqueness of MAC addresses).
>
> A DHCP client generally takes out a lease on the first Offer it receives,
> so when your clients are wired, its a matter of response time as to which
> DHCP Server it will take a lease from... Try out the split configuration,
> and see if it works for you.
>
> Another option: Have you tried your wireless clients with the Linksys'
> DHCP Server turned off? If it allows you to associate to the AP portion,
> and then allows you to do the DHCP broadcasts onto the subnet, then you
> may be home free with just one DHCP Server...
> --
> ==============================
> Chris Edson
> (E-Mail Removed)
>
> Upcoming Tech Chat !
> August 24, 1:00-2:00p Pacific
> DHCP: Configuring and Deploying DHCP with Windows Server 2003 Part 2
> Join the DHCP test team as we talk about any questions, concerns, or
> recommendations you might have for DHCP Server in Windows Server 2003.
> Chat Room:
> http://communities2.microsoft.com/ho...iteid=34000015
>
> Transcript of previous chat:
> http://www.microsoft.com/technet/com...k/net1120.mspx
>
> This posting is provided "AS IS" with
> no warranties, and confers no rights.
> ===============================
>
>
>
> "Miha Pihler" <mihap-(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> Not really. Clients use broadcasts to find DHCP server and if two DHCP
>> servers respond with configuration they will use first one that responded
>> and ignore the second one.
>>
>> What you can do is have two DHCP at the same time. The only thing you
>> have
>> to watch out for is that they don't server same IPs.
>>
>> E.g. you can give first DHCP a range of IPs from 192.168.1.50-149 and
>> second
>> DHCP range from 192.168.1.150-254.
>>
>> One problem is, you can make reservations on only one of them.
>>
>> Mike
>>
>>
>> "boe" <(E-Mail Removed)> wrote in message
>> news:(E-Mail Removed)...
>>> I have my file server acting as a DHCP server. All of my workstations
>>> receive their IP address from it at 192.168.1.200. It services
>>> 192.168.1.100-199. My FW/gateway is at 192.168.1.8
>>>
>>> I have a linksys wireless gateway that by default is 192.168.1.1 and can

>> act
>>> as a DHCP server. I can easily change the address of this.
>>>
>>> Is there any way to make sure that one is only selected if the network

>> card
>>> cannot find the main DHCP server? Basically I'd like the PC's with

>> network
>>> cards to go to the file server first. The laptops with wireless cards

>> would
>>> scan for any dhcp server they could find and that would be the wireless
>>> gateway. Is there a way to make this happen?
>>>
>>> Thanks
>>>
>>>

>>
>>

>
>



 
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boe
Guest
Posts: n/a

 
      08-20-2004, 05:42 AM
Thank you

"Miha Pihler" <mihap-(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Not really. Clients use broadcasts to find DHCP server and if two DHCP
> servers respond with configuration they will use first one that responded
> and ignore the second one.
>
> What you can do is have two DHCP at the same time. The only thing you have
> to watch out for is that they don't server same IPs.
>
> E.g. you can give first DHCP a range of IPs from 192.168.1.50-149 and
> second
> DHCP range from 192.168.1.150-254.
>
> One problem is, you can make reservations on only one of them.
>
> Mike
>
>
> "boe" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> I have my file server acting as a DHCP server. All of my workstations
>> receive their IP address from it at 192.168.1.200. It services
>> 192.168.1.100-199. My FW/gateway is at 192.168.1.8
>>
>> I have a linksys wireless gateway that by default is 192.168.1.1 and can

> act
>> as a DHCP server. I can easily change the address of this.
>>
>> Is there any way to make sure that one is only selected if the network

> card
>> cannot find the main DHCP server? Basically I'd like the PC's with

> network
>> cards to go to the file server first. The laptops with wireless cards

> would
>> scan for any dhcp server they could find and that would be the wireless
>> gateway. Is there a way to make this happen?
>>
>> Thanks
>>
>>

>
>



 
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