DHCP server on a different subnet

Lyle Giese lyle at lcrcomputer.net
Thu May 12 01:50:21 UTC 2011

On 05/11/11 11:21, Alex Bligh wrote:
> --On 11 May 2011 23:04:27 +1000 Glenn Satchell
> <glenn.satchell at uniq.com.au> wrote:
>> Sounds like it should work just fine. This is standard behaviour for
>> remote subnets, for example. You can't always configure the dhcp server
>> to have an interface on every subnet it serves.
> Thanks. I am familiar with remote subnets but they tend to use a proxy.
> I am not using a proxy but relying on having an interface on the same
> broadcast domain but not the same subnet. I can't see how a reasonable
> client could differentiate this from a proxy, but as we all know not
> all clients do reasonable things!
That is the purpose of the proxy.  To be on the same network and when 
relaying the DHCP request identify to the DHCP server what subnet it 
came from.

DHCP relay is normally handled by the router(default gateway)

But if an interface is on the same broadcast domain, but on a different 
subnet, how will that interface determine what subnet the broadcast 
packet came from?  I don't think it can.

Lyle Giese
LCR Computer Services, Inc.

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