[c-nsp] Weird DHCP like service required - anyone?

[Bruce Pinsky]

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Skeeve Stevens wrote:
> Hi guys,
> 
> 	I am trying to accomplish something which I am not sure is possible.
> 
> 	I have a network with some 40 Cisco 1811's in it.  I want to run
> DHCP, but I want to run it centrally.
> 
> 	Each 1811 might be serving 100-500 clients. so a /24 or /23 will
> most likely do (with possible for expansion).
> 
> 	While this will be DHCP assigned, it will be from static assignments
> based on each persons MAC address.
> 
> 	So, thousand of users, going into their respective 1811, the 1811 ip
> dhcp helper forwarding the request to a Linux box.
> 
> 	Then the Linux box should see the MAC and give back the appropriate
> IP.
> 
> 	It would be nice if any unknown MAC's could be given a walled-garden
> kind of IP.
> 
> 	Does this sound odd? Or is it something where there is a solution
> for.  Can I use a Linux DHCP server which will work with the 1811's?
> 

To summarize what others have said....

Use "ip helper-address" to forward the DHCP broadcasts to your Linux (or
other) DHCP server.    Assuming your DHCP server can assign addresses based
on MAC address (most can),  you are set on that req't.  As for the
"walled-garden", it will depend on your DHCP server implementation as to
how it handles address requests from various GIADDR addresses.  You may
have to allocate a range of addresses per subnet or you may be able to
assign addresses out of a central pool for all the remote locations.

For more info check out
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00804412bf.html#wp1085170

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bep

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